Installation and Configuration
OpenShift Container Platform 3.3 Installation and Configuration
Abstract
Chapter 1. Overview
OpenShift Container Platform Installation and Configuration topics cover the basics of installing and configuring OpenShift Container Platform in your environment. Configuration, management, and logging are also covered. Use these topics for the one-time tasks required to quickly set up your OpenShift Container Platform environment and configure it based on your organizational needs.
For day to day cluster administration tasks, see Cluster Administration.
Chapter 2. Installing a Cluster
2.1. Planning
2.1.1. Initial Planning
For production environments, several factors influence installation. Consider the following questions as you read through the documentation:
- Which installation method do you want to use? The Installation Methods section provides some information about the quick and advanced installation methods.
- How many hosts do you require in the cluster? The Environment Scenarios section provides multiple examples of Single Master and Multiple Master configurations.
- How many pods are required in your cluster? The Sizing Considerations section provides limits for nodes and pods so you can calculate how large your environment needs to be.
- Is high availability required? High availability is recommended for fault tolerance. In this situation, you might aim to use the Multiple Masters Using Native HA example as a basis for your environment.
- Which installation type do you want to use: RPM or containerized? Both installations provide a working OpenShift Container Platform environment, but you might have a preference for a particular method of installing, managing, and updating your services.
- Is my installation supported if integrating with other technologies? See the OpenShift Container Platform Tested Integrations for a list of tested integrations.
2.1.2. Installation Methods
Both the quick and advanced installation methods are supported for development and production environments. If you want to quickly get OpenShift Container Platform up and running to try out for the first time, use the quick installer and let the interactive CLI guide you through the configuration options relevant to your environment.
For the most control over your cluster’s configuration, you can use the advanced installation method. This method is particularly suited if you are already familiar with Ansible. However, following along with the OpenShift Container Platform documentation should equip you with enough information to reliably deploy your cluster and continue to manage its configuration post-deployment using the provided Ansible playbooks directly.
If you install initially using the quick installer, you can always further tweak your cluster’s configuration and adjust the number of hosts in the cluster using the same installer tool. If you wanted to later switch to using the advanced method, you can create an inventory file for your configuration and carry on that way.
2.1.3. Sizing Considerations
Determine how many nodes and pods you require for your OpenShift Container Platform cluster. Cluster scalability correlates to the number of pods in a cluster environment. That number influences the other numbers in your setup.
The following table provides the maximum sizing limits for nodes and pods:
Type | Maximum |
---|---|
Maximum nodes per cluster | 1000 |
Maximum pods per cluster | 120,000 |
Maximum pods per node | 250 |
Maximum pods per core | 10 |
Oversubscribing the physical resources on a node affects resource guarantees the Kubernetes scheduler makes during pod placement. Learn what measures you can take to avoid memory swapping.
Determine how many pods are expected to fit per node:
Maximum Pods per Cluster / Expected Pods per Node = Total Number of Nodes
Example Scenario
If you want to scope your cluster for 2200 pods per cluster, you would need at least 9 nodes, assuming that there are 250 maximum pods per node:
2200 / 250 = 8.8
If you increase the number of nodes to 20, then the pod distribution changes to 110 pods per node:
2200 / 20 = 110
2.1.4. Environment Scenarios
This section outlines different examples of scenarios for your OpenShift Container Platform environment. Use these scenarios as a basis for planning your own OpenShift Container Platform cluster.
Moving from a single master cluster to multiple masters after installation is not supported.
2.1.4.1. Single Master and Multiple Nodes
The following table describes an example environment for a single master (with embedded etcd) and two nodes:
Host Name | Infrastructure Component to Install |
---|---|
master.example.com | Master and node |
node1.example.com | Node |
node2.example.com |
2.1.4.2. Single Master, Multiple etcd, and Multiple Nodes
The following table describes an example environment for a single master, three etcd hosts, and two nodes:
Host Name | Infrastructure Component to Install |
---|---|
master.example.com | Master and node |
etcd1.example.com | etcd |
etcd2.example.com | |
etcd3.example.com | |
node1.example.com | Node |
node2.example.com |
When specifying multiple etcd hosts, external etcd is installed and configured. Clustering of OpenShift Container Platform’s embedded etcd is not supported.
2.1.4.3. Multiple Masters Using Native HA
The following describes an example environment for three masters, one HAProxy load balancer, three etcd hosts, and two nodes using the native
HA method:
Host Name | Infrastructure Component to Install |
---|---|
master1.example.com | Master (clustered using native HA) and node |
master2.example.com | |
master3.example.com | |
lb.example.com | HAProxy to load balance API master endpoints |
etcd1.example.com | etcd |
etcd2.example.com | |
etcd3.example.com | |
node1.example.com | Node |
node2.example.com |
When specifying multiple etcd hosts, external etcd is installed and configured. Clustering of OpenShift Container Platform’s embedded etcd is not supported.
2.1.4.4. Stand-alone Registry
You can also install OpenShift Container Platform to act as a stand-alone registry using the OpenShift Container Platform’s integrated registry. See Installing a Stand-alone Registry for details on this scenario.
2.1.5. RPM vs Containerized
An RPM installation installs all services through package management and configures services to run within the same user space, while a containerized installation configures installs services using container images and runs separate services in individual containers.
The default method for installing OpenShift Container Platform on Red Hat Enterprise Linux (RHEL) uses RPMs. Alternatively, you can use the containerized method, which deploys containerized OpenShift Container Platform master and node components. When targeting a RHEL Atomic Host system, the containerized method is the only available option, and is automatically selected for you based on the detection of the /run/ostree-booted file.
The following table outlines the differences between the RPM and Containerized methods:
Type | RPM | Containerized |
---|---|---|
Installation Method |
Packages via |
Container images via |
Service Management |
|
|
Operating System | Red Hat Enterprise Linux | Red Hat Enterprise Linux or Red Hat Atomic Host |
The Containerized Installation Preparation section provides more details on configuring your installation to use containerized services.
2.2. Prerequisites
2.2.1. System Requirements
The following sections identify the hardware specifications and system-level requirements of all hosts within your OpenShift Container Platform environment.
2.2.1.1. Red Hat Subscriptions
You must have an active OpenShift Container Platform subscription on your Red Hat account to proceed. If you do not, contact your sales representative for more information.
OpenShift Container Platform 3.3 requires Docker 1.10.
2.2.1.2. Minimum Hardware Requirements
The system requirements vary per host type:
| |
| |
Separate etcd Nodes |
|
OpenShift Container Platform only supports servers with the x86_64 architecture.
Meeting the /var/ file system sizing requirements in RHEL Atomic Host requires making changes to the default configuration. See Managing Storage in Red Hat Enterprise Linux Atomic Host for instructions on configuring this during or after installation.
2.2.1.3. Production Level Hardware Requirements
Test or sample environments function with the minimum requirements. For production environments, the following recommendations apply:
- Master Hosts
- In a highly available OpenShift Container Platform cluster with a separate etcd cluster, a master host should have, in addition to the minimum requirements in the table above, 1 CPU core and 1.5 GB of memory for each 1000 pods. Therefore, the recommended size of a master host in an OpenShift Container Platform cluster of 2000 pods would be the minimum requirements of 2 CPU cores and 16 GB of RAM, plus 2 CPU cores and 3 GB of RAM, totaling 4 CPU cores and 19 GB of RAM.
When planning an environment with multiple masters, a minimum of three etcd hosts and a load-balancer between the master hosts are required.
The OpenShift Container Platform master caches deserialized versions of resources aggressively to ease CPU load. However, in smaller clusters of less than 1000 pods, this cache can waste a lot of memory for negligible CPU load reduction. The default cache size is 50,000 entries, which, depending on the size of your resources, can grow to occupy 1 to 2 GB of memory. This cache size can be reduced using the following setting the in /etc/origin/master/master-config.yaml:
kubernetesMasterConfig: apiServerArguments: deserialization-cache-size: - "1000"
- Node Hosts
- The size of a node host depends on the expected size of its workload. As an OpenShift Container Platform cluster administrator, you will need to calculate the expected workload, then add about 10 percent for overhead. For production environments, allocate enough resources so that a node host failure does not affect your maximum capacity.
Use the above with the following table to plan the maximum loads for nodes and pods:
Host | Sizing Recommendation |
---|---|
Maximum nodes per cluster | 1000 |
Maximum pods per cluster | 120000 |
Maximum pods per nodes | 250 |
Maximum pods per core | 10 |
Oversubscribing the physical resources on a node affects resource guarantees the Kubernetes scheduler makes during pod placement. Learn what measures you can take to avoid memory swapping.
2.2.1.4. Configuring Core Usage
By default, OpenShift Container Platform masters and nodes use all available cores in the system they run on. You can choose the number of cores you want OpenShift Container Platform to use by setting the GOMAXPROCS
environment variable.
For example, run the following before starting the server to make OpenShift Container Platform only run on one core:
# export GOMAXPROCS=1
2.2.1.5. SELinux
Security-Enhanced Linux (SELinux) must be enabled on all of the servers before installing OpenShift Container Platform or the installer will fail. Also, configure SELINUXTYPE=targeted
in the /etc/selinux/config file:
# This file controls the state of SELinux on the system. # SELINUX= can take one of these three values: # enforcing - SELinux security policy is enforced. # permissive - SELinux prints warnings instead of enforcing. # disabled - No SELinux policy is loaded. SELINUX=enforcing # SELINUXTYPE= can take one of these three values: # targeted - Targeted processes are protected, # minimum - Modification of targeted policy. Only selected processes are protected. # mls - Multi Level Security protection. SELINUXTYPE=targeted
2.2.1.6. NTP
You must enable Network Time Protocol (NTP) to prevent masters and nodes in the cluster from going out of sync. Set openshift_clock_enabled
to true
in the Ansible playbook to enable NTP on masters and nodes in the cluster during Ansible installation.
# openshift_clock_enabled=true
2.2.1.7. Security Warning
OpenShift Container Platform runs containers on your hosts, and in some cases, such as build operations and the registry service, it does so using privileged containers. Furthermore, those containers access your host’s Docker daemon and perform docker build
and docker push
operations. As such, you should be aware of the inherent security risks associated with performing docker run
operations on arbitrary images as they effectively have root access.
For more information, see these articles:
To address these risks, OpenShift Container Platform uses security context constraints that control the actions that pods can perform and what it has the ability to access.
2.2.2. Environment Requirements
The following section defines the requirements of the environment containing your OpenShift Container Platform configuration. This includes networking considerations and access to external services, such as Git repository access, storage, and cloud infrastructure providers.
2.2.2.1. DNS
OpenShift Container Platform requires a fully functional DNS server in the environment. This is ideally a separate host running DNS software and can provide name resolution to hosts and containers running on the platform.
Adding entries into the /etc/hosts file on each host is not enough. This file is not copied into containers running on the platform.
Key components of OpenShift Container Platform run themselves inside of containers and use the following process for name resolution:
- By default, containers receive their DNS configuration file (/etc/resolv.conf) from their host.
-
OpenShift Container Platform then inserts one DNS value into the pods (above the node’s nameserver values). That value is defined in the /etc/origin/node/node-config.yaml file by the
dnsIP
parameter, which by default is set to the address of the host node because the host is using dnsmasq. -
If the
dnsIP
parameter is omitted from the node-config.yaml file, then the value defaults to the kubernetes service IP, which is the first nameserver in the pod’s /etc/resolv.conf file.
As of OpenShift Container Platform 3.2, dnsmasq is automatically configured on all masters and nodes. The pods use the nodes as their DNS, and the nodes forward the requests. By default, dnsmasq is configured on the nodes to listen on port 53, therefore the nodes cannot run any other type of DNS application.
Previously, in OpenShift Container Platform 3.1, a DNS server could not be installed on a master node, because it ran its own internal DNS server. Now, with master nodes using dnsmasq, SkyDNS is now configured to listen on port 8053 so that dnsmasq can run on the masters. Note that these DNS changes (dnsmasq configured on nodes and the SkyDNS port change) only apply to new installations of OpenShift Container Platform 3.2. Clusters upgraded to OpenShift Container Platform 3.2 from a previous version do not currently have these changes applied during the upgrade process.
NetworkManager is required on the nodes in order to populate dnsmasq with the DNS IP addresses.
The following is an example set of DNS records for the Single Master and Multiple Nodes scenario:
master A 10.64.33.100 node1 A 10.64.33.101 node2 A 10.64.33.102
If you do not have a properly functioning DNS environment, you could experience failure with:
- Product installation via the reference Ansible-based scripts
- Deployment of the infrastructure containers (registry, routers)
- Access to the OpenShift Container Platform web console, because it is not accessible via IP address alone
2.2.2.1.1. Configuring Hosts to Use DNS
Make sure each host in your environment is configured to resolve hostnames from your DNS server. The configuration for hosts' DNS resolution depend on whether DHCP is enabled. If DHCP is:
- Disabled, then configure your network interface to be static, and add DNS nameservers to NetworkManager.
Enabled, then the NetworkManager dispatch script automatically configures DNS based on the DHCP configuration. Optionally, you can add a value to
dnsIP
in the node-config.yaml file to prepend the pod’s resolv.conf file. The second nameserver is then defined by the host’s first nameserver. By default, this will be the IP address of the node host.NoteFor most configurations, do not set the
openshift_dns_ip
option during the advanced installation of OpenShift Container Platform (using Ansible), because this option overrides the default IP address set bydnsIP
.Instead, allow the installer to configure each node to use dnsmasq and forward requests to SkyDNS or the external DNS provider. If you do set the
openshift_dns_ip
option, then it should be set either with a DNS IP that queries SkyDNS first, or to the SkyDNS service or endpoint IP (the Kubernetes service IP).
To verify that hosts can be resolved by your DNS server:
Check the contents of /etc/resolv.conf:
$ cat /etc/resolv.conf # Generated by NetworkManager search example.com nameserver 10.64.33.1 # nameserver updated by /etc/NetworkManager/dispatcher.d/99-origin-dns.sh
In this example, 10.64.33.1 is the address of our DNS server.
Test that the DNS servers listed in /etc/resolv.conf are able to resolve host names to the IP addresses of all masters and nodes in your OpenShift Container Platform environment:
$ dig <node_hostname> @<IP_address> +short
For example:
$ dig master.example.com @10.64.33.1 +short 10.64.33.100 $ dig node1.example.com @10.64.33.1 +short 10.64.33.101
2.2.2.1.2. Disabling dnsmasq
If you want to disable dnsmasq (for example, if your /etc/resolv.conf is managed by a configuration tool other than NetworkManager), then set openshift_use_dnsmasq
to false in the Ansible playbook.
However, certain containers do not properly move to the next nameserver when the first issues SERVFAIL. Red Hat Enterprise Linux (RHEL)-based containers do not suffer from this, but certain versions of uclibc and musl do.
2.2.2.1.3. Configuring a DNS Wildcard
Optionally, configure a wildcard for the router to use, so that you do not need to update your DNS configuration when new routes are added.
A wildcard for a DNS zone must ultimately resolve to the IP address of the OpenShift Container Platform router.
For example, create a wildcard DNS entry for cloudapps that has a low time-to-live value (TTL) and points to the public IP address of the host where the router will be deployed:
*.cloudapps.example.com. 300 IN A 192.168.133.2
In almost all cases, when referencing VMs you must use host names, and the host names that you use must match the output of the hostname -f
command on each node.
In your /etc/resolv.conf file on each node host, ensure that the DNS server that has the wildcard entry is not listed as a nameserver or that the wildcard domain is not listed in the search list. Otherwise, containers managed by OpenShift Container Platform may fail to resolve host names properly.
2.2.2.2. Network Access
A shared network must exist between the master and node hosts. If you plan to configure multiple masters for high-availability using the advanced installation method, you must also select an IP to be configured as your virtual IP (VIP) during the installation process. The IP that you select must be routable between all of your nodes, and if you configure using a FQDN it should resolve on all nodes.
2.2.2.2.1. NetworkManager
NetworkManager, a program for providing detection and configuration for systems to automatically connect to the network, is required.
2.2.2.2.2. Required Ports
The OpenShift Container Platform installation automatically creates a set of internal firewall rules on each host using iptables
. However, if your network configuration uses an external firewall, such as a hardware-based firewall, you must ensure infrastructure components can communicate with each other through specific ports that act as communication endpoints for certain processes or services.
Ensure the following ports required by OpenShift Container Platform are open on your network and configured to allow access between hosts. Some ports are optional depending on your configuration and usage.
4789 | UDP | Required for SDN communication between pods on separate hosts. |
53 or 8053 | TCP/UDP | Required for DNS resolution of cluster services (SkyDNS). Installations prior to 3.2 or environments upgraded to 3.2 use port 53. New installations will use 8053 by default so that dnsmasq may be configured. |
4789 | UDP | Required for SDN communication between pods on separate hosts. |
443 or 8443 | TCP | Required for node hosts to communicate to the master API, for the node hosts to post back status, to receive tasks, and so on. |
4789 | UDP | Required for SDN communication between pods on separate hosts. |
10250 | TCP |
The master proxies to node hosts via the Kubelet for |
In the following table, (L) indicates the marked port is also used in loopback mode, enabling the master to communicate with itself.
In a single-master cluster:
- Ports marked with (L) must be open.
- Ports not marked with (L) need not be open.
In a multiple-master cluster, all the listed ports must be open.
53 (L) or 8053 (L) | TCP/UDP | Required for DNS resolution of cluster services (SkyDNS). Installations prior to 3.2 or environments upgraded to 3.2 use port 53. New installations will use 8053 by default so that dnsmasq may be configured. |
2049 (L) | TCP/UDP | Required when provisioning an NFS host as part of the installer. |
2379 | TCP | Used for standalone etcd (clustered) to accept changes in state. |
2380 | TCP | etcd requires this port be open between masters for leader election and peering connections when using standalone etcd (clustered). |
4001 (L) | TCP | Used for embedded etcd (non-clustered) to accept changes in state. |
4789 (L) | UDP | Required for SDN communication between pods on separate hosts. |
9000 | TCP |
If you choose the |
443 or 8443 | TCP | Required for node hosts to communicate to the master API, for node hosts to post back status, to receive tasks, and so on. |
22 | TCP | Required for SSH by the installer or system administrator. |
53 or 8053 | TCP/UDP | Required for DNS resolution of cluster services (SkyDNS). Installations prior to 3.2 or environments upgraded to 3.2 use port 53. New installations will use 8053 by default so that dnsmasq may be configured. Only required to be internally open on master hosts. |
80 or 443 | TCP | For HTTP/HTTPS use for the router. Required to be externally open on node hosts, especially on nodes running the router. |
1936 | TCP | For router statistics use. Required to be open when running the template router to access statistics, and can be open externally or internally to connections depending on if you want the statistics to be expressed publicly. |
4001 | TCP | For embedded etcd (non-clustered) use. Only required to be internally open on the master host. 4001 is for server-client connections. |
2379 and 2380 | TCP | For standalone etcd use. Only required to be internally open on the master host. 2379 is for server-client connections. 2380 is for server-server connections, and is only required if you have clustered etcd. |
4789 | UDP | For VxLAN use (OpenShift Container Platform SDN). Required only internally on node hosts. |
8443 | TCP | For use by the OpenShift Container Platform web console, shared with the API server. |
10250 | TCP | For use by the Kubelet. Required to be externally open on nodes. |
Notes
- In the above examples, port 4789 is used for User Datagram Protocol (UDP).
- When deployments are using the SDN, the pod network is accessed via a service proxy, unless it is accessing the registry from the same node the registry is deployed on.
-
OpenShift Container Platform internal DNS cannot be received over SDN. Depending on the detected values of
openshift_facts
, or if theopenshift_ip
andopenshift_public_ip
values are overridden, it will be the computed value ofopenshift_ip
. For non-cloud deployments, this will default to the IP address associated with the default route on the master host. For cloud deployments, it will default to the IP address associated with the first internal interface as defined by the cloud metadata. -
The master host uses port 10250 to reach the nodes and does not go over SDN. It depends on the target host of the deployment and uses the computed values of
openshift_hostname
andopenshift_public_hostname
.
9200 | TCP |
For Elasticsearch API use. Required to be internally open on any infrastructure nodes so Kibana is able to retrieve logs for display. It can be externally opened for direct access to Elasticsearch by means of a route. The route can be created using |
9300 | TCP | For Elasticsearch inter-cluster use. Required to be internally open on any infrastructure node so the members of the Elasticsearch cluster may communicate with each other. |
2.2.2.3. Persistent Storage
The Kubernetes persistent volume framework allows you to provision an OpenShift Container Platform cluster with persistent storage using networked storage available in your environment. This can be done after completing the initial OpenShift Container Platform installation depending on your application needs, giving users a way to request those resources without having any knowledge of the underlying infrastructure.
The Installation and Configuration Guide provides instructions for cluster administrators on provisioning an OpenShift Container Platform cluster with persistent storage using NFS, GlusterFS, Ceph RBD, OpenStack Cinder, AWS Elastic Block Store (EBS), GCE Persistent Disks, and iSCSI.
2.2.2.4. Cloud Provider Considerations
There are certain aspects to take into consideration if installing OpenShift Container Platform on a cloud provider.
2.2.2.4.1. Configuring a Security Group
When installing on AWS or OpenStack, ensure that you set up the appropriate security groups. These are some ports that you should have in your security groups, without which the installation will fail. You may need more depending on the cluster configuration you want to install. For more information and to adjust your security groups accordingly, see Required Ports for more information.
All OpenShift Container Platform Hosts |
|
etcd Security Group |
|
Master Security Group |
|
Node Security Group |
|
Infrastructure Nodes (ones that can host the OpenShift Container Platform router) |
|
If configuring ELBs for load balancing the masters and/or routers, you also need to configure Ingress and Egress security groups for the ELBs appropriately.
2.2.2.4.2. Overriding Detected IP Addresses and Host Names
Some deployments require that the user override the detected host names and IP addresses for the hosts. To see the default values, run the openshift_facts
playbook:
# ansible-playbook playbooks/byo/openshift_facts.yml
Now, verify the detected common settings. If they are not what you expect them to be, you can override them.
The Advanced Installation topic discusses the available Ansible variables in greater detail.
Variable | Usage |
---|---|
|
|
|
|
|
|
|
|
|
|
If openshift_hostname
is set to a value other than the metadata-provided private-dns-name
value, the native cloud integration for those providers will no longer work.
In AWS, situations that require overriding the variables include:
Variable | Usage |
---|---|
|
The user is installing in a VPC that is not configured for both |
|
Possibly if they have multiple network interfaces configured and they want to use one other than the default. You must first set |
|
|
|
|
If setting openshift_hostname
to something other than the metadata-provided private-dns-name
value, the native cloud integration for those providers will no longer work.
For EC2 hosts in particular, they must be deployed in a VPC that has both DNS host names
and DNS resolution
enabled, and openshift_hostname
should not be overridden.
2.2.2.4.3. Post-Installation Configuration for Cloud Providers
Following the installation process, you can configure OpenShift Container Platform for AWS, OpenStack, or GCE.
2.3. Host Preparation
2.3.1. Operating System Requirements
A base installation of RHEL 7.1 or later or RHEL Atomic Host 7.2.6 or later is required for master and node hosts. See the following documentation for the respective installation instructions, if required:
2.3.2. Host Registration
Each host must be registered using Red Hat Subscription Manager (RHSM) and have an active OpenShift Container Platform subscription attached to access the required packages.
On each host, register with RHSM:
# subscription-manager register --username=<user_name> --password=<password>
List the available subscriptions:
# subscription-manager list --available --matches '*OpenShift*'
In the output for the previous command, find the pool ID for an OpenShift Container Platform subscription and attach it:
# subscription-manager attach --pool=<pool_id>
Disable all yum repositories:
Disable all the enabled RHSM repositories:
# subscription-manager repos --disable="*"
List the remaining yum repositories and note their names under
repo id
, if any:# yum repolist
Use
yum-config-manager
to disable the remaining yum repositories:# yum-config-manager --disable <repo_id>
Alternatively, disable all repositories:
yum-config-manager --disable \*
Note that this could take a few minutes if you have a large number of available repositories
Enable only the repositories required by OpenShift Container Platform 3.3:
# subscription-manager repos \ --enable="rhel-7-server-rpms" \ --enable="rhel-7-server-extras-rpms" \ --enable="rhel-7-server-ose-3.3-rpms"
2.3.3. Installing Base Packages
For RHEL 7 systems:
Install the following base packages:
# yum install wget git net-tools bind-utils yum-utils iptables-services bridge-utils bash-completion kexec-tools sos psacct
Update the system to the latest packages:
# yum update
Install the following package, which provides OpenShift Container Platform utilities and pulls in other tools required by the quick and advanced installation methods, such as Ansible and related configuration files:
# yum install atomic-openshift-utils
Downgrade the Ansible version 2.3.2. The 2.4 verson installed by the
atomic-openshift-utils
package will cause the installer to fail. For example:# yum downgrade ansible-2.3.2.0-2.el7.noarch
Install the following *-excluder packages on each RHEL 7 system, which helps ensure your systems stay on the correct versions of atomic-openshift and docker packages when you are not trying to upgrade, according to the OpenShift Container Platform version:
# yum install atomic-openshift-excluder atomic-openshift-docker-excluder
The *-excluder packages add entries to the
exclude
directive in the host’s /etc/yum.conf file when installed. Run the following command on each host to remove the atomic-openshift packages from the list for the duration of the installation.# atomic-openshift-excluder unexclude
For RHEL Atomic Host 7 systems:
Ensure the host is up to date by upgrading to the latest Atomic tree if one is available:
# atomic host upgrade
After the upgrade is completed and prepared for the next boot, reboot the host:
# systemctl reboot
2.3.4. Installing Docker
At this point, you should install Docker on all master and node hosts. This allows you to configure your Docker storage options before installing OpenShift Container Platform.
For RHEL 7 systems, install Docker 1.10.
NoteOn RHEL Atomic Host 7 systems, Docker should already be installed, configured, and running by default.
The atomic-openshift-docker-excluder package that was installed in Installing Base Packages should ensure that the correct version of Docker is installed in this step:
# yum install docker
After the package installation is complete, verify that version 1.10.3 was installed:
# docker version
Edit the /etc/sysconfig/docker file and add
--insecure-registry 172.30.0.0/16
to theOPTIONS
parameter. For example:OPTIONS='--selinux-enabled --insecure-registry 172.30.0.0/16'
If using the Quick Installation method, you can easily script a complete installation from a kickstart or cloud-init setup, change the default configuration file:
# sed -i '/OPTIONS=.*/c\OPTIONS="--selinux-enabled --insecure-registry 172.30.0.0/16"' \ /etc/sysconfig/docker
NoteThe Advanced Installation method automatically changes /etc/sysconfig/docker.
The
--insecure-registry
option instructs the Docker daemon to trust any Docker registry on the indicated subnet, rather than requiring a certificate.Important172.30.0.0/16 is the default value of the
servicesSubnet
variable in the master-config.yaml file. If this has changed, then the--insecure-registry
value in the above step should be adjusted to match, as it is indicating the subnet for the registry to use. Note that theopenshift_portal_net
variable can be set in the Ansible inventory file and used during the advanced installation method to modify theservicesSubnet
variable.NoteAfter the initial OpenShift Container Platform installation is complete, you can choose to secure the integrated Docker registry, which involves adjusting the
--insecure-registry
option accordingly.
2.3.5. Configuring Docker Storage
Containers and the images they are created from are stored in Docker’s storage back end. This storage is ephemeral and separate from any persistent storage allocated to meet the needs of your applications.
For RHEL Atomic Host
The default storage back end for Docker on RHEL Atomic Host is a thin pool logical volume, which is supported for production environments. You must ensure that enough space is allocated for this volume per the Docker storage requirements mentioned in System Requirements.
If you do not have enough allocated, see Managing Storage with Docker Formatted Containers for details on using docker-storage-setup and basic instructions on storage management in RHEL Atomic Host.
For RHEL
The default storage back end for Docker on RHEL 7 is a thin pool on loopback devices, which is not supported for production use and only appropriate for proof of concept environments. For production environments, you must create a thin pool logical volume and re-configure Docker to use that volume.
You can use the docker-storage-setup script included with Docker to create a thin pool device and configure Docker’s storage driver. This can be done after installing Docker and should be done before creating images or containers. The script reads configuration options from the /etc/sysconfig/docker-storage-setup file and supports three options for creating the logical volume:
- Option A) Use an additional block device.
- Option B) Use an existing, specified volume group.
- Option C) Use the remaining free space from the volume group where your root file system is located.
Option A is the most robust option, however it requires adding an additional block device to your host before configuring Docker storage. Options B and C both require leaving free space available when provisioning your host.
Create the docker-pool volume using one of the following three options:
Option A) Use an additional block device.
In /etc/sysconfig/docker-storage-setup, set DEVS to the path of the block device you wish to use. Set VG to the volume group name you wish to create; docker-vg is a reasonable choice. For example:
# cat <<EOF > /etc/sysconfig/docker-storage-setup DEVS=/dev/vdc VG=docker-vg EOF
Then run docker-storage-setup and review the output to ensure the docker-pool volume was created:
# docker-storage-setup [5/1868] 0 Checking that no-one is using this disk right now ... OK Disk /dev/vdc: 31207 cylinders, 16 heads, 63 sectors/track sfdisk: /dev/vdc: unrecognized partition table type Old situation: sfdisk: No partitions found New situation: Units: sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/vdc1 2048 31457279 31455232 8e Linux LVM /dev/vdc2 0 - 0 0 Empty /dev/vdc3 0 - 0 0 Empty /dev/vdc4 0 - 0 0 Empty Warning: partition 1 does not start at a cylinder boundary Warning: partition 1 does not end at a cylinder boundary Warning: no primary partition is marked bootable (active) This does not matter for LILO, but the DOS MBR will not boot this disk. Successfully wrote the new partition table Re-reading the partition table ... If you created or changed a DOS partition, /dev/foo7, say, then use dd(1) to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1 (See fdisk(8).) Physical volume "/dev/vdc1" successfully created Volume group "docker-vg" successfully created Rounding up size to full physical extent 16.00 MiB Logical volume "docker-poolmeta" created. Logical volume "docker-pool" created. WARNING: Converting logical volume docker-vg/docker-pool and docker-vg/docker-poolmeta to pool's data and metadata volumes. THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.) Converted docker-vg/docker-pool to thin pool. Logical volume "docker-pool" changed.
Option B) Use an existing, specified volume group.
In /etc/sysconfig/docker-storage-setup, set VG to the desired volume group. For example:
# cat <<EOF > /etc/sysconfig/docker-storage-setup VG=docker-vg EOF
Then run docker-storage-setup and review the output to ensure the docker-pool volume was created:
# docker-storage-setup Rounding up size to full physical extent 16.00 MiB Logical volume "docker-poolmeta" created. Logical volume "docker-pool" created. WARNING: Converting logical volume docker-vg/docker-pool and docker-vg/docker-poolmeta to pool's data and metadata volumes. THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.) Converted docker-vg/docker-pool to thin pool. Logical volume "docker-pool" changed.
Option C) Use the remaining free space from the volume group where your root file system is located.
Verify that the volume group where your root file system resides has the desired free space, then run docker-storage-setup and review the output to ensure the docker-pool volume was created:
# docker-storage-setup Rounding up size to full physical extent 32.00 MiB Logical volume "docker-poolmeta" created. Logical volume "docker-pool" created. WARNING: Converting logical volume rhel/docker-pool and rhel/docker-poolmeta to pool's data and metadata volumes. THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.) Converted rhel/docker-pool to thin pool. Logical volume "docker-pool" changed.
Verify your configuration. You should have a dm.thinpooldev value in the /etc/sysconfig/docker-storage file and a docker-pool logical volume:
# cat /etc/sysconfig/docker-storage DOCKER_STORAGE_OPTIONS=--storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker--vg-docker--pool # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert docker-pool rhel twi-a-t--- 9.29g 0.00 0.12
ImportantBefore using Docker or OpenShift Container Platform, verify that the docker-pool logical volume is large enough to meet your needs. The docker-pool volume should be 60% of the available volume group and will grow to fill the volume group via LVM monitoring.
Check if Docker is running:
# systemctl is-active docker
If Docker has not yet been started on the host, enable and start the service:
# systemctl enable docker # systemctl start docker
If Docker is already running, re-initialize Docker:
WarningThis will destroy any containers or images currently on the host.
# systemctl stop docker # rm -rf /var/lib/docker/* # systemctl restart docker
If there is any content in /var/lib/docker/, it must be deleted. Files will be present if Docker has been used prior to the installation of OpenShift Container Platform.
2.3.5.1. Reconfiguring Docker Storage
Should you need to reconfigure Docker storage after having created the docker-pool, you should first remove the docker-pool logical volume. If you are using a dedicated volume group, you should also remove the volume group and any associated physical volumes before reconfiguring docker-storage-setup according to the instructions above.
See Logical Volume Manager Administration for more detailed information on LVM management.
2.3.5.2. Managing Container Logs
Sometimes a container’s log file (the /var/lib/docker/containers/<hash>/<hash>-json.log file on the node where the container is running) can increase to a problematic size. You can manage this by configuring Docker’s json-file
logging driver to restrict the size and number of log files.
Option | Purpose |
---|---|
| Sets the size at which a new log file is created. |
| Sets the file on each host to configure the options. |
For example, to set the maximum file size to 1MB and always keep the last three log files, edit the /etc/sysconfig/docker file to configure max-size=1M
and max-file=3
:
OPTIONS='--insecure-registry=172.30.0.0/16 --selinux-enabled --log-opt max-size=1M --log-opt max-file=3'
Next, restart the Docker service:
# systemctl restart docker
2.3.5.3. Viewing Available Container Logs
Container logs are stored in the /var/lib/docker/containers/<hash>/ directory on the node where the container is running. For example:
# ls -lh /var/lib/docker/containers/f088349cceac173305d3e2c2e4790051799efe363842fdab5732f51f5b001fd8/ total 2.6M -rw-r--r--. 1 root root 5.6K Nov 24 00:12 config.json -rw-r--r--. 1 root root 649K Nov 24 00:15 f088349cceac173305d3e2c2e4790051799efe363842fdab5732f51f5b001fd8-json.log -rw-r--r--. 1 root root 977K Nov 24 00:15 f088349cceac173305d3e2c2e4790051799efe363842fdab5732f51f5b001fd8-json.log.1 -rw-r--r--. 1 root root 977K Nov 24 00:15 f088349cceac173305d3e2c2e4790051799efe363842fdab5732f51f5b001fd8-json.log.2 -rw-r--r--. 1 root root 1.3K Nov 24 00:12 hostconfig.json drwx------. 2 root root 6 Nov 24 00:12 secrets
See Docker’s documentation for additional information on how to Configure Logging Drivers.
2.3.6. Ensuring Host Access
The quick and advanced installation methods require a user that has access to all hosts. If you want to run the installer as a non-root user, passwordless sudo rights must be configured on each destination host.
For example, you can generate an SSH key on the host where you will invoke the installation process:
# ssh-keygen
Do not use a password.
An easy way to distribute your SSH keys is by using a bash
loop:
# for host in master.example.com \ node1.example.com \ node2.example.com; \ do ssh-copy-id -i ~/.ssh/id_rsa.pub $host; \ done
Modify the host names in the above command according to your configuration.
2.3.7. Setting Global Proxy Values
The OpenShift Container Platform installer uses the proxy settings in the _/etc/environment _ file.
Ensure the following domain suffixes and IP addresses are in the /etc/environment file in the no_proxy
parameter:
- Master and node host names (domain suffix).
- Other internal host names (domain suffix).
- Etcd IP addresses (must be IP addresses and not host names, as etcd access is done by IP address).
- Docker registry IP address.
-
Kubernetes IP address, by default 172.30.0.1. Must be the value set in the
openshift_portal_net
parameter in the Ansible inventory file, by default /etc/ansible/hosts. -
Kubernetes internal domain suffix:
cluster.local
. -
Kubernetes internal domain suffix:
.svc
.
The following example assumes http_proxy
and https_proxy
values are set:
no_proxy=.internal.example.com,10.0.0.1,10.0.0.2,10.0.0.3,.cluster.local,.svc,localhost,127.0.0.1,172.30.0.1
Because noproxy
does not support CIDR, you can use domain suffixes.
2.3.8. What’s Next?
If you are interested in installing OpenShift Container Platform using the containerized method (optional for RHEL but required for RHEL Atomic Host), see Containerized Components to prepare your hosts.
When you are ready to proceed, you can install OpenShift Container Platform using the quick installation or advanced installation method.
If you are installing a stand-alone registry, continue with Installing a Stand-alone Registry.
2.4. Containerized Components
2.4.1. Overview
This section explores some of the preparation required to install OpenShift Container Platform as a set of services within containers. This applies to hosts using either Red Hat Enterprise Linux or Red Hat Atomic Host.
- For the quick installation method, you can choose between the RPM or containerized method on a per host basis during the interactive installation, or set the values manually in an installation configuration file.
-
For the advanced installation method, you can set the Ansible variable
containerized=true
in an inventory file on a cluster-wide or per host basis.
When installing an environment with multiple masters, the load balancer cannot be deployed by the installation process as a container. See Advanced Installation for load balancer requirements using the native HA method.
The following sections detail the preparation for a containerized OpenShift Container Platform installation.
2.4.2. Required Images
Containerized installations make use of the following images:
- openshift3/ose
- openshift3/node
- openshift3/openvswitch
- registry.access.redhat.com/rhel7/etcd
By default, all of the above images are pulled from the Red Hat Registry at registry.access.redhat.com.
If you need to use a private registry to pull these images during the installation, you can specify the registry information ahead of time. For the advanced installation method, you can set the following Ansible variables in your inventory file, as required:
cli_docker_additional_registries=<registry_hostname> cli_docker_insecure_registries=<registry_hostname> cli_docker_blocked_registries=<registry_hostname>
For the quick installation method, you can export the following environment variables on each target host:
# export OO_INSTALL_ADDITIONAL_REGISTRIES=<registry_hostname> # export OO_INSTALL_INSECURE_REGISTRIES=<registry_hostname>
Blocked Docker registries cannot currently be specified using the quick installation method.
The configuration of additional, insecure, and blocked Docker registries occurs at the beginning of the installation process to ensure that these settings are applied before attempting to pull any of the required images.
2.4.3. Starting and Stopping Containers
The installation process creates relevant systemd units which can be used to start, stop, and poll services using normal systemctl commands. For containerized installations, these unit names match those of an RPM installation, with the exception of the etcd service which is named etcd_container.
This change is necessary as currently RHEL Atomic Host ships with the etcd package installed as part of the operating system, so a containerized version is used for the OpenShift Container Platform installation instead. The installation process disables the default etcd service. The etcd package is slated to be removed from RHEL Atomic Host in the future.
2.4.4. File Paths
All OpenShift configuration files are placed in the same locations during containerized installation as RPM based installations and will survive os-tree upgrades.
However, the default image stream and template files are installed at /etc/origin/examples/ for containerized installations rather than the standard /usr/share/openshift/examples/, because that directory is read-only on RHEL Atomic Host.
2.4.5. Storage Requirements
RHEL Atomic Host installations normally have a very small root file system. However, the etcd, master, and node containers persist data in the /var/lib/ directory. Ensure that you have enough space on the root file system before installing OpenShift Container Platform; see the System Requirements section for details.
2.4.6. Open vSwitch SDN Initialization
OpenShift Container Platform SDN initialization requires that the Docker bridge be reconfigured and that Docker is restarted. This complicates the situation when the node is running within a container. When using the Open vSwitch (OVS) SDN, you will see the node start, reconfigure Docker, restart Docker (which restarts all containers), and finally start successfully.
In this case, the node service may fail to start and be restarted a few times because the master services are also restarted along with Docker. The current implementation uses a workaround which relies on setting the Restart=always
parameter in the Docker based systemd units.
2.5. Quick Installation
2.5.1. Overview
The quick installation method allows you to use an interactive CLI utility, the atomic-openshift-installer
command, to install OpenShift Container Platform across a set of hosts. This installer can deploy OpenShift Container Platform components on targeted hosts by either installing RPMs or running containerized services.
This installation method is provided to make the installation experience easier by interactively gathering the data needed to run on each host. The installer is a self-contained wrapper intended for usage on a Red Hat Enterprise Linux (RHEL) 7 system. While RHEL Atomic Host is supported for running containerized OpenShift Container Platform services, the installer is provided by an RPM not available by default in RHEL Atomic Host, and must therefore be run from a RHEL 7 system. The host initiating the installation does not need to be intended for inclusion in the OpenShift Container Platform cluster, but it can be.
In addition to running interactive installations from scratch, the atomic-openshift-installer
command can also be run or re-run using a predefined installation configuration file. This file can be used with the installer to:
- run an unattended installation,
- add nodes to an existing cluster,
- upgrade your cluster, or
- reinstall the OpenShift Container Platform cluster completely.
Alternatively, you can use the advanced installation method for more complex environments.
To install OpenShift Container Platform as a stand-alone registry, see Installing a Stand-alone Registry.
2.5.2. Before You Begin
The installer allows you to install OpenShift Container Platform master and node components on a defined set of hosts.
By default, any hosts you designate as masters during the installation process are automatically also configured as nodes so that the masters are configured as part of the OpenShift Container Platform SDN. The node component on the masters, however, are marked unschedulable, which blocks pods from being scheduled on it. After the installation, you can mark them schedulable if you want.
Before installing OpenShift Container Platform, you must first satisfy the prerequisites on your hosts, which includes verifying system and environment requirements and properly installing and configuring Docker. You must also be prepared to provide or validate the following information for each of your targeted hosts during the course of the installation:
- User name on the target host that should run the Ansible-based installation (can be root or non-root)
- Host name
- Whether to install components for master, node, or both
- Whether to use the RPM or containerized method
- Internal and external IP addresses
If you are interested in installing OpenShift Container Platform using the containerized method (optional for RHEL but required for RHEL Atomic Host), see RPM vs Containerized to ensure that you understand the differences between these methods, then return to this topic to continue.
After following the instructions in the Prerequisites topic and deciding between the RPM and containerized methods, you can continue to running an interactive or unattended installation.
2.5.3. Running an Interactive Installation
Ensure you have read through Before You Begin.
You can start the interactive installation by running:
$ atomic-openshift-installer install
Then follow the on-screen instructions to install a new OpenShift Container Platform cluster.
After it has finished, ensure that you back up the ~/.config/openshift/installer.cfg.ymlinstallation configuration file that is created, as it is required if you later want to re-run the installation, add hosts to the cluster, or upgrade your cluster. Then, verify the installation.
2.5.4. Defining an Installation Configuration File
The installer can use a predefined installation configuration file, which contains information about your installation, individual hosts, and cluster. When running an interactive installation, an installation configuration file based on your answers is created for you in ~/.config/openshift/installer.cfg.yml. The file is created if you are instructed to exit the installation to manually modify the configuration or when the installation completes. You can also create the configuration file manually from scratch to perform an unattended installation.
Example 2.1. Installation Configuration File Specification
version: v2 1 variant: openshift-enterprise 2 variant_version: 3.3 3 ansible_log_path: /tmp/ansible.log 4 deployment: ansible_ssh_user: root 5 hosts: 6 - ip: 10.0.0.1 7 hostname: master-private.example.com 8 public_ip: 24.222.0.1 9 public_hostname: master.example.com 10 roles: 11 - master - node containerized: true 12 connect_to: 24.222.0.1 13 - ip: 10.0.0.2 hostname: node1-private.example.com public_ip: 24.222.0.2 public_hostname: node1.example.com node_labels: {'region': 'infra'} 14 roles: - node connect_to: 10.0.0.2 - ip: 10.0.0.3 hostname: node2-private.example.com public_ip: 24.222.0.3 public_hostname: node2.example.com roles: - node connect_to: 10.0.0.3 roles: 15 master: <variable_name1>: "<value1>" 16 <variable_name2>: "<value2>" node: <variable_name1>: "<value1>" 17
- 1
- The version of this installation configuration file. As of OpenShift Container Platform 3.3, the only valid version here is
v2
. - 2
- The OpenShift Container Platform variant to install. For OpenShift Container Platform, set this to
openshift-enterprise
. - 3
- A valid version of your selected variant:
3.3
,3.2
, or3.1
. If not specified, this defaults to the latest version for the specified variant. - 4
- Defines where the Ansible logs are stored. By default, this is the /tmp/ansible.log file.
- 5
- Defines which user Ansible uses to SSH in to remote systems for gathering facts and for the installation. By default, this is the root user, but you can set it to any user that has sudo privileges.
- 6
- Defines a list of the hosts onto which you want to install the OpenShift Container Platform master and node components.
- 7 8
- Required. Allows the installer to connect to the system and gather facts before proceeding with the install.
- 9 10
- Required for unattended installations. If these details are not specified, then this information is pulled from the facts gathered by the installer, and you are asked to confirm the details. If undefined for an unattended installation, the installation fails.
- 11
- Determines the type of services that are installed. Specified as a list.
- 12
- If set to true, containerized OpenShift Container Platform services are run on target master and node hosts instead of installed using RPM packages. If set to false or unset, the default RPM method is used. RHEL Atomic Host requires the containerized method, and is automatically selected for you based on the detection of the /run/ostree-booted file. See RPM vs Containerized for more details.
- 13
- The IP address that Ansible attempts to connect to when installing, upgrading, or uninstalling the systems. If the configuration file was auto-generated, then this is the value you first enter for the host during that interactive install process.
- 14
- Node labels can optionally be set per-host.
- 15
- Defines a dictionary of roles across the deployment.
- 16 17
- Any ansible variables that should only be applied to hosts assigned a role can be defined. For examples, see Configuring Ansible.
2.5.5. Running an Unattended Installation
Ensure you have read through the Before You Begin.
Unattended installations allow you to define your hosts and cluster configuration in an installation configuration file before running the installer so that you do not have to go through all of the interactive installation questions and answers. It also allows you to resume an interactive installation you may have left unfinished, and quickly get back to where you left off.
To run an unattended installation, first define an installation configuration file at ~/.config/openshift/installer.cfg.yml. Then, run the installer with the -u
flag:
$ atomic-openshift-installer -u install
By default in interactive or unattended mode, the installer uses the configuration file located at ~/.config/openshift/installer.cfg.yml if the file exists. If it does not exist, attempting to start an unattended installation fails.
Alternatively, you can specify a different location for the configuration file using the -c
option, but doing so will require you to specify the file location every time you run the installation:
$ atomic-openshift-installer -u -c </path/to/file> install
After the unattended installation finishes, ensure that you back up the ~/.config/openshift/installer.cfg.yml file that was used, as it is required if you later want to re-run the installation, add hosts to the cluster, or upgrade your cluster. Then, verify the installation.
2.5.6. Verifying the Installation
After the installation completes:
Verify that the master is started and nodes are registered and reporting in Ready status. On the master host, run the following as root:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
To verify that the web console is installed correctly, use the master host name and the console port number to access the console with a web browser.
For example, for a master host with a hostname of
master.openshift.com
and using the default port of8443
, the web console would be found at:https://master.openshift.com:8443/console
Now that the install has been verified, run the following command on each master and node host to add the atomic-openshift packages back to the list of yum excludes on the host:
# atomic-openshift-excluder exclude
Then, see What’s Next for the next steps on configuring your OpenShift Container Platform cluster.
2.5.7. Uninstalling OpenShift Container Platform
You can uninstall OpenShift Container Platform on all hosts in your cluster using the installer by running:
$ atomic-openshift-installer uninstall
See the advanced installation method for more options.
2.5.8. What’s Next?
Now that you have a working OpenShift Container Platform instance, you can:
- Configure authentication; by default, authentication is set to Deny All.
- Configure the automatically-deployed integrated Docker registry.
- Configure the automatically-deployed router.
2.6. Advanced Installation
2.6.1. Overview
A reference configuration implemented using Ansible playbooks is available as the advanced installation method for installing a OpenShift Container Platform cluster. Familiarity with Ansible is assumed, however you can use this configuration as a reference to create your own implementation using the configuration management tool of your choosing.
While RHEL Atomic Host is supported for running containerized OpenShift Container Platform services, the advanced installation method utilizes Ansible, which is not available in RHEL Atomic Host, and must therefore be run from a RHEL 7 system. The host initiating the installation does not need to be intended for inclusion in the OpenShift Container Platform cluster, but it can be.
Alternatively, you can use the quick installation method if you prefer an interactive installation experience.
To install OpenShift Container Platform as a stand-alone registry, see Installing a Stand-alone Registry.
Running Ansible playbooks with the --tags
or --check
options is not supported by Red Hat.
2.6.2. Before You Begin
Before installing OpenShift Container Platform, you must first see the Prerequisites and Host Preparation topics to prepare your hosts. This includes verifying system and environment requirements per component type and properly installing and configuring Docker. It also includes installing Ansible version 2.2.0 or later, as the advanced installation method is based on Ansible playbooks and as such requires directly invoking Ansible.
If you are interested in installing OpenShift Container Platform using the containerized method (optional for RHEL but required for RHEL Atomic Host), see RPM vs Containerized to ensure that you understand the differences between these methods, then return to this topic to continue.
After following the instructions in the Prerequisites topic and deciding between the RPM and containerized methods, you can continue in this topic to Configuring Ansible.
2.6.3. Configuring Ansible
The /etc/ansible/hosts file is Ansible’s inventory file for the playbook to use during the installation. The inventory file describes the configuration for your OpenShift Container Platform cluster. You must replace the default contents of the file with your desired configuration.
The following sections describe commonly-used variables to set in your inventory file during an advanced installation, followed by example inventory files you can use as a starting point for your installation. The examples describe various environment topographies, including using multiple masters for high availability. You can choose an example that matches your requirements, modify it to match your own environment, and use it as your inventory file when running the advanced installation.
2.6.3.1. Configuring Host Variables
To assign environment variables to hosts during the Ansible installation, indicate the desired variables in the /etc/ansible/hosts file after the host entry in the [masters] or [nodes] sections. For example:
[masters] ec2-52-6-179-239.compute-1.amazonaws.com openshift_public_hostname=ose3-master.public.example.com
The following table describes variables for use with the Ansible installer that can be assigned to individual host entries:
Variable | Purpose |
---|---|
| This variable overrides the internal cluster host name for the system. Use this when the system’s default IP address does not resolve to the system host name. |
| This variable overrides the system’s public host name. Use this for cloud installations, or for hosts on networks using a network address translation (NAT). |
| This variable overrides the cluster internal IP address for the system. Use this when using an interface that is not configured with the default route. This variable can also be used for etcd. |
| This variable overrides the system’s public IP address. Use this for cloud installations, or for hosts on networks using a network address translation (NAT). |
| If set to true, containerized OpenShift Container Platform services are run on target master and node hosts instead of installed using RPM packages. If set to false or unset, the default RPM method is used. RHEL Atomic Host requires the containerized method, and is automatically selected for you based on the detection of the /run/ostree-booted file. See RPM vs Containerized for more details. Containerized installations are supported starting in OpenShift Container Platform 3.1.1. |
| This variable adds labels to nodes during installation. See Configuring Node Host Labels for more details. |
|
This variable is used to configure |
| This variable configures additional Docker options within /etc/sysconfig/docker, such as options used in Managing Container Logs. Example usage: "--log-driver json-file --log-opt max-size=1M --log-opt max-file=3". |
| This variable configures whether the host is marked as a schedulable node, meaning that it is available for placement of new pods. See Configuring Schedulability on Masters. |
Image Version Policy
Images require a version number policy in order to maintain updates. See the Image Version Tag Policy section in the Architecture Guide for more information.
2.6.3.2. Configuring Cluster Variables
To assign environment variables during the Ansible install that apply more globally to your OpenShift Container Platform cluster overall, indicate the desired variables in the /etc/ansible/hosts file on separate, single lines within the [OSEv3:vars] section. For example:
[OSEv3:vars] openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] openshift_master_default_subdomain=apps.test.example.com
The following table describes variables for use with the Ansible installer that can be assigned cluster-wide:
Variable | Purpose |
---|---|
| This variable sets the SSH user for the installer to use and defaults to root. This user should allow SSH-based authentication without requiring a password. If using SSH key-based authentication, then the key should be managed by an SSH agent. |
|
If |
|
This variable sets which INFO messages are logged to the
For more information on debug log levels, see Configuring Logging Levels. |
| If set to true, containerized OpenShift Container Platform services are run on all target master and node hosts in the cluster instead of installed using RPM packages. If set to false or unset, the default RPM method is used. RHEL Atomic Host requires the containerized method, and is automatically selected for you based on the detection of the /run/ostree-booted file. See RPM vs Containerized for more details. Containerized installations are supported starting in OpenShift Container Platform 3.1.1. |
| This variable overrides the host name for the cluster, which defaults to the host name of the master. |
| This variable overrides the public host name for the cluster, which defaults to the host name of the master. If you use an external load balancer, specify the address of the external load balancer. For example: ---- openshift_master_cluster_public_hostname=openshift-ansible.public.example.com ---- |
|
Optional. This variable defines the HA method when deploying multiple masters. Supports the |
|
This variable enables rolling restarts of HA masters (i.e., masters are taken down one at a time) when running the upgrade playbook directly. It defaults to |
| This variable configures which OpenShift Container Platform SDN plug-in to use for the pod network, which defaults to redhat/openshift-ovs-subnet for the standard SDN plug-in. Set the variable to redhat/openshift-ovs-multitenant to use the multitenant plug-in. |
| This variable overrides the identity provider, which defaults to Deny All. |
| These variables are used to configure custom certificates which are deployed as part of the installation. See Configuring Custom Certificates for more information. |
| |
| These variables override defaults for session options in the OAuth configuration. See Configuring Session Options for more information. |
| |
| |
| |
| This variable configures the subnet in which services will be created within the OpenShift Container Platform SDN. This network block should be private and must not conflict with any existing network blocks in your infrastructure to which pods, nodes, or the master may require access to, or the installation will fail. Defaults to 172.30.0.0/16, and cannot be re-configured after deployment. If changing from the default, avoid 172.17.0.0/16, which the docker0 network bridge uses by default, or modify the docker0 network. |
| This variable overrides the default subdomain to use for exposed routes. |
| This variable specifies the service proxy mode to use: either iptables for the default, pure-iptables implementation, or userspace for the user space proxy. |
| Default node selector for automatically deploying router pods. See Configuring Node Host Labels for details. |
| Default node selector for automatically deploying registry pods. See Configuring Node Host Labels for details. |
| This variable overrides the node selector that projects will use by default when placing pods. |
| This variable overrides the SDN cluster network CIDR block. This is the network from which pod IPs are assigned. This network block should be a private block and must not conflict with existing network blocks in your infrastructure to which pods, nodes, or the master may require access. Defaults to 10.128.0.0/14 and cannot be arbitrarily re-configured after deployment, although certain changes to it can be made in the SDN master configuration. |
| This variable specifies the size of the per host subnet allocated for pod IPs by OpenShift Container Platform SDN. Defaults to 9 which means that a subnet of size /23 is allocated to each host; for example, given the default 10.128.0.0/14 cluster network, this will allocate 10.128.0.0/23, 10.128.2.0/23, 10.128.4.0/23, and so on. This cannot be re-configured after deployment. |
| OpenShift Container Platform adds the specified additional registry or registries to the Docker configuration. |
| OpenShift Container Platform adds the specified additional insecure registry or registries to the Docker configuration. |
| OpenShift Container Platform adds the specified blocked registry or registries to the Docker configuration. |
|
This variable sets the host name for integration with the metrics console. The default is |
2.6.3.3. Configuring a Registry Location
If you are using an image registry other than the default at registry.access.redhat.com
, specify the desired registry within the /etc/ansible/hosts file.
oreg_url=example.com/openshift3/ose-${component}:${version} openshift_examples_modify_imagestreams=true
Variable | Purpose |
---|---|
|
Set to the alternate image location. Necessary if you are not using the default registry at |
|
Set to |
2.6.3.4. Configuring Global Proxy Options
If your hosts require use of a HTTP or HTTPS proxy in order to connect to external hosts, there are many components that must be configured to use the proxy, including masters, Docker, and builds. Node services only connect to the master API requiring no external access and therefore do not need to be configured to use a proxy.
In order to simplify this configuration, the following Ansible variables can be specified at a cluster or host level to apply these settings uniformly across your environment.
See Configuring Global Build Defaults and Overrides for more information on how the proxy environment is defined for builds.
Variable | Purpose |
---|---|
|
This variable specifies the |
|
This variable specifices the |
|
This variable is used to set the |
|
This boolean variable specifies whether or not the names of all defined OpenShift hosts and |
|
This variable defines the |
|
This variable defines the |
|
This variable defines the |
|
This variable defines the HTTP proxy used by |
|
This variable defines the HTTPS proxy used by |
2.6.3.5. Configuring Schedulability on Masters
Any hosts you designate as masters during the installation process should also be configured as nodes so that the masters are configured as part of the OpenShift SDN. You must do so by adding entries for these hosts to the [nodes]
section:
[nodes] master.example.com
In order to ensure that your masters are not burdened with running pods, they are automatically marked unschedulable by default by the installer, meaning that new pods cannot be placed on the hosts. This is the same as setting the openshift_schedulable=false
host variable.
You can manually set a master host to schedulable during installation using the openshift_schedulable=true
host variable, though this is not recommended in production environments:
[nodes] master.example.com openshift_schedulable=true
If you want to change the schedulability of a host post-installation, see Marking Nodes as Unschedulable or Schedulable.
2.6.3.6. Configuring Node Host Labels
You can assign labels to node hosts during the Ansible install by configuring the /etc/ansible/hosts file. Labels are useful for determining the placement of pods onto nodes using the scheduler. Other than region=infra
(discussed in Configuring Dedicated Infrastructure Nodes), the actual label names and values are arbitrary and can be assigned however you see fit per your cluster’s requirements.
To assign labels to a node host during an Ansible install, use the openshift_node_labels
variable with the desired labels added to the desired node host entry in the [nodes]
section. In the following example, labels are set for a region called primary
and a zone called east
:
[nodes] node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}"
2.6.3.6.1. Configuring Dedicated Infrastructure Nodes
The openshift_router_selector
and openshift_registry_selector
Ansible settings determine the label selectors used when placing registry and router pods. They are set to region=infra
by default:
# default selectors for router and registry services # openshift_router_selector='region=infra' # openshift_registry_selector='region=infra'
The default router and registry will be automatically deployed during installation if nodes exist in the [nodes]
section that match the selector settings. For example:
[nodes] infra-node1.example.com openshift_node_labels="{'region': 'infra','zone': 'default'}"
The registry and router are only able to run on node hosts with the region=infra
label. Ensure that at least one node host in your OpenShift Container Platform environment has the region=infra
label.
It is recommended for production environments that you maintain dedicated infrastructure nodes where the registry and router pods can run separately from pods used for user applications.
As described in Configuring Schedulability on Masters, master hosts are marked unschedulable by default. If you label a master host with region=infra
and have no other dedicated infrastructure nodes, you must also explicitly mark these master hosts as schedulable. Otherwise, the registry and router pods cannot be placed anywhere:
[nodes] master.example.com openshift_node_labels="{'region': 'infra','zone': 'default'}" openshift_schedulable=true
2.6.3.7. Configuring Session Options
Session options in the OAuth configuration are configurable in the inventory file. By default, Ansible populates a sessionSecretsFile
with generated authentication and encryption secrets so that sessions generated by one master can be decoded by the others. The default location is /etc/origin/master/session-secrets.yaml, and this file will only be re-created if deleted on all masters.
You can set the session name and maximum number of seconds with openshift_master_session_name
and openshift_master_session_max_seconds
:
openshift_master_session_name=ssn openshift_master_session_max_seconds=3600
If provided, openshift_master_session_auth_secrets
and openshift_master_encryption_secrets
must be equal length.
For openshift_master_session_auth_secrets
, used to authenticate sessions using HMAC, it is recommended to use secrets with 32 or 64 bytes:
openshift_master_session_auth_secrets=['DONT+USE+THIS+SECRET+b4NV+pmZNSO']
For openshift_master_encryption_secrets
, used to encrypt sessions, secrets must be 16, 24, or 32 characters long, to select AES-128, AES-192, or AES-256:
openshift_master_session_encryption_secrets=['DONT+USE+THIS+SECRET+b4NV+pmZNSO']
2.6.3.8. Configuring Custom Certificates
Custom serving certificates for the public host names of the OpenShift Container Platform API and web console can be deployed during an advanced installation and are configurable in the inventory file.
Custom certificates should only be configured for the host name associated with the publicMasterURL
which can be set using openshift_master_cluster_public_hostname
. Using a custom serving certificate for the host name associated with the masterURL
(openshift_master_cluster_hostname
) will result in TLS errors as infrastructure components will attempt to contact the master API using the internal masterURL
host.
Certificate and key file paths can be configured using the openshift_master_named_certificates
cluster variable:
openshift_master_named_certificates=[{"certfile": "/path/to/custom1.crt", "keyfile": "/path/to/custom1.key"}]
File paths must be local to the system where Ansible will be run. Certificates are copied to master hosts and are deployed within the /etc/origin/master/named_certificates/ directory.
Ansible detects a certificate’s Common Name
and Subject Alternative Names
. Detected names can be overridden by providing the "names"
key when setting openshift_master_named_certificates
:
openshift_master_named_certificates=[{"certfile": "/path/to/custom1.crt", "keyfile": "/path/to/custom1.key", "names": ["public-master-host.com"]}]
Certificates configured using openshift_master_named_certificates
are cached on masters, meaning that each additional Ansible run with a different set of certificates results in all previously deployed certificates remaining in place on master hosts and within the master configuration file.
If you would like openshift_master_named_certificates
to be overwritten with the provided value (or no value), specify the openshift_master_overwrite_named_certificates
cluster variable:
openshift_master_overwrite_named_certificates=true
For a more complete example, consider the following cluster variables in an inventory file:
openshift_master_cluster_method=native openshift_master_cluster_hostname=lb-internal.openshift.com openshift_master_cluster_public_hostname=custom.openshift.com
To overwrite the certificates on a subsequent Ansible run, you could set the following:
openshift_master_named_certificates=[{"certfile": "/root/STAR.openshift.com.crt", "keyfile": "/root/STAR.openshift.com.key", "names": ["custom.openshift.com"]}] openshift_master_overwrite_named_certificates=true
2.6.3.9. Configuring Deployment Type
Various defaults used throughout the playbooks and roles in this repository are set based on the deployment type configuration (usually defined in an Ansible hosts file).
Ensure the deployment_type
parameter in your inventory file is set to openshift-enterprise
.
2.6.4. Configuring Cluster Metrics
Cluster metrics are not set to automatically deploy by default. Set the following to enable cluster metrics when using the advanced install:
[OSEv3:vars] openshift_hosted_metrics_deploy=true
In accordance with upstream Kubernetes rules, metrics can be collected only on the default interface of eth0
.
2.6.4.1. Metrics Storage
The openshift_hosted_metrics_storage_kind
variable must be set in order to use persistent storage. If openshift_hosted_metrics_storage_kind
is not set, then cluster metrics data is stored in an EmptyDir
volume, which will be deleted when the Cassandra pod terminates.
There are three options for enabling cluster metrics storage when using the advanced install:
Option A - NFS Host Group
When the following variables are set, an NFS volume is created during an advanced install with path <nfs_directory>/<volume_name> on the host within the [nfs] host group. For example, the volume path using these options would be /exports/metrics:
[OSEv3:vars] openshift_hosted_metrics_storage_kind=nfs openshift_hosted_metrics_storage_access_modes=['ReadWriteOnce'] openshift_hosted_metrics_storage_nfs_directory=/exports openshift_hosted_metrics_storage_nfs_options='*(rw,root_squash)' openshift_hosted_metrics_storage_volume_name=metrics openshift_hosted_metrics_storage_volume_size=10Gi
Option B - External NFS Host
To use an external NFS volume, one must already exist with a path of <nfs_directory>/<volume_name> on the storage host.
[OSEv3:vars] openshift_hosted_metrics_storage_kind=nfs openshift_hosted_metrics_storage_access_modes=['ReadWriteOnce'] openshift_hosted_metrics_storage_host=nfs.example.com openshift_hosted_metrics_storage_nfs_directory=/exports openshift_hosted_metrics_storage_volume_name=metrics openshift_hosted_metrics_storage_volume_size=10Gi
The remote volume path using the following options would be nfs.example.com:/exports/metrics.
Option C - Dynamic
Use the following variable if your OpenShift Container Platform environment supports dynamic volume provisioning for your cloud platform:
[OSEv3:vars] #openshift_hosted_metrics_storage_kind=dynamic
2.6.5. Single Master Examples
You can configure an environment with a single master and multiple nodes, and either a single embedded etcd or multiple external etcd hosts.
Moving from a single master cluster to multiple masters after installation is not supported.
Single Master and Multiple Nodes
The following table describes an example environment for a single master (with embedded etcd) and two nodes:
Host Name | Infrastructure Component to Install |
---|---|
master.example.com | Master and node |
node1.example.com | Node |
node2.example.com |
You can see these example hosts present in the [masters] and [nodes] sections of the following example inventory file:
Example 2.2. Single Master and Multiple Nodes Inventory File
# Create an OSEv3 group that contains the masters and nodes groups [OSEv3:children] masters nodes # Set variables common for all OSEv3 hosts [OSEv3:vars] # SSH user, this user should allow ssh based auth without requiring a password ansible_ssh_user=root # If ansible_ssh_user is not root, ansible_become must be set to true #ansible_become=true deployment_type=openshift-enterprise # uncomment the following to enable htpasswd authentication; defaults to DenyAllPasswordIdentityProvider #openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] # host group for masters [masters] master.example.com # host group for nodes, includes region info [nodes] master.example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
To use this example, modify the file to match your environment and specifications, and save it as /etc/ansible/hosts.
Single Master, Multiple etcd, and Multiple Nodes
The following table describes an example environment for a single master, three etcd hosts, and two nodes:
Host Name | Infrastructure Component to Install |
---|---|
master.example.com | Master and node |
etcd1.example.com | etcd |
etcd2.example.com | |
etcd3.example.com | |
node1.example.com | Node |
node2.example.com |
When specifying multiple etcd hosts, external etcd is installed and configured. Clustering of OpenShift Container Platform’s embedded etcd is not supported.
You can see these example hosts present in the [masters], [nodes], and [etcd] sections of the following example inventory file:
Example 2.3. Single Master, Multiple etcd, and Multiple Nodes Inventory File
# Create an OSEv3 group that contains the masters, nodes, and etcd groups [OSEv3:children] masters nodes etcd # Set variables common for all OSEv3 hosts [OSEv3:vars] ansible_ssh_user=root deployment_type=openshift-enterprise # uncomment the following to enable htpasswd authentication; defaults to DenyAllPasswordIdentityProvider #openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] # host group for masters [masters] master.example.com # host group for etcd [etcd] etcd1.example.com etcd2.example.com etcd3.example.com # host group for nodes, includes region info [nodes] master.example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
To use this example, modify the file to match your environment and specifications, and save it as /etc/ansible/hosts.
2.6.6. Multiple Masters Examples
You can configure an environment with multiple masters, multiple etcd hosts, and multiple nodes. Configuring multiple masters for high availability (HA) ensures that the cluster has no single point of failure.
Moving from a single master cluster to multiple masters after installation is not supported.
When configuring multiple masters, the advanced installation supports the following high availability (HA) method:
| Leverages the native HA master capabilities built into OpenShift Container Platform and can be combined with any load balancing solution. If a host is defined in the [lb] section of the inventory file, Ansible installs and configures HAProxy automatically as the load balancing solution. If no host is defined, it is assumed you have pre-configured a load balancing solution of your choice to balance the master API (port 8443) on all master hosts. |
For your pre-configured load balancing solution, you must have:
- A pre-created load balancer VIP configured for SSL passthrough.
A domain name for VIP registered in DNS.
-
The domain name will become the value of both
openshift_master_cluster_public_hostname
andopenshift_master_cluster_hostname
in the OpenShift Container Platform installer.
-
The domain name will become the value of both
See External Load Balancer Integrations for more information.
For more on the high availability master architecture, see Kubernetes Infrastructure.
Note the following when using the native
HA method:
- The advanced installation method does not currently support multiple HAProxy load balancers in an active-passive setup. See the Load Balancer Administration documentation for post-installation amendments.
-
In a HAProxy setup, controller manager servers run as standalone processes. They elect their active leader with a lease stored in etcd. The lease expires after 30 seconds by default. If a failure happens on an active controller server, it will take up to this number of seconds to elect another leader. The interval can be configured with the
osm_controller_lease_ttl
variable.
To configure multiple masters, refer to the following section.
Multiple Masters with Multiple etcd, and Using Native HA
The following describes an example environment for three masters, one HAProxy load balancer, three etcd hosts, and two nodes using the native
HA method:
Host Name | Infrastructure Component to Install |
---|---|
master1.example.com | Master (clustered using native HA) and node |
master2.example.com | |
master3.example.com | |
lb.example.com | HAProxy to load balance API master endpoints |
etcd1.example.com | etcd |
etcd2.example.com | |
etcd3.example.com | |
node1.example.com | Node |
node2.example.com |
When specifying multiple etcd hosts, external etcd is installed and configured. Clustering of OpenShift Container Platform’s embedded etcd is not supported.
You can see these example hosts present in the [masters], [etcd], [lb], and [nodes] sections of the following example inventory file:
Example 2.4. Multiple Masters Using HAProxy Inventory File
# Create an OSEv3 group that contains the master, nodes, etcd, and lb groups. # The lb group lets Ansible configure HAProxy as the load balancing solution. # Comment lb out if your load balancer is pre-configured. [OSEv3:children] masters nodes etcd lb # Set variables common for all OSEv3 hosts [OSEv3:vars] ansible_ssh_user=root deployment_type=openshift-enterprise # Uncomment the following to enable htpasswd authentication; defaults to # DenyAllPasswordIdentityProvider. #openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] # Native high availbility cluster method with optional load balancer. # If no lb group is defined installer assumes that a load balancer has # been preconfigured. For installation the value of # openshift_master_cluster_hostname must resolve to the load balancer # or to one or all of the masters defined in the inventory if no load # balancer is present. openshift_master_cluster_method=native openshift_master_cluster_hostname=openshift-internal.example.com openshift_master_cluster_public_hostname=openshift-cluster.example.com # apply updated node defaults openshift_node_kubelet_args={'pods-per-core': ['10'], 'max-pods': ['250'], 'image-gc-high-threshold': ['90'], 'image-gc-low-threshold': ['80']} # override the default controller lease ttl #osm_controller_lease_ttl=30 # enable ntp on masters to ensure proper failover openshift_clock_enabled=true # host group for masters [masters] master1.example.com master2.example.com master3.example.com # host group for etcd [etcd] etcd1.example.com etcd2.example.com etcd3.example.com # Specify load balancer host [lb] lb.example.com # host group for nodes, includes region info [nodes] master[1:3].example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
To use this example, modify the file to match your environment and specifications, and save it as /etc/ansible/hosts.
Multiple Masters with Master and etcd on the Same Host, and Using Native HA
The following describes an example environment for three masters with etcd on each host, one HAProxy load balancer, and two nodes using the native
HA method:
Host Name | Infrastructure Component to Install |
---|---|
master1.example.com | Master (clustered using native HA) and node with etcd on each host |
master2.example.com | |
master3.example.com | |
lb.example.com | HAProxy to load balance API master endpoints |
node1.example.com | Node |
node2.example.com |
You can see these example hosts present in the [masters], [etcd], [lb], and [nodes] sections of the following example inventory file:
# Create an OSEv3 group that contains the master, nodes, etcd, and lb groups. # The lb group lets Ansible configure HAProxy as the load balancing solution. # Comment lb out if your load balancer is pre-configured. [OSEv3:children] masters nodes etcd lb # Set variables common for all OSEv3 hosts [OSEv3:vars] ansible_ssh_user=root deployment_type=openshift-enterprise # Uncomment the following to enable htpasswd authentication; defaults to # DenyAllPasswordIdentityProvider. #openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] # Native high availbility cluster method with optional load balancer. # If no lb group is defined installer assumes that a load balancer has # been preconfigured. For installation the value of # openshift_master_cluster_hostname must resolve to the load balancer # or to one or all of the masters defined in the inventory if no load # balancer is present. openshift_master_cluster_method=native openshift_master_cluster_hostname=openshift-internal.example.com openshift_master_cluster_public_hostname=openshift-cluster.example.com # override the default controller lease ttl #osm_controller_lease_ttl=30 # host group for masters [masters] master1.example.com master2.example.com master3.example.com # host group for etcd [etcd] master1.example.com master2.example.com master3.example.com # Specify load balancer host [lb] lb.example.com # host group for nodes, includes region info [nodes] master[1:3].example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
To use this example, modify the file to match your environment and specifications, and save it as /etc/ansible/hosts.
2.6.7. Running the Advanced Installation
After you have configured Ansible by defining an inventory file in /etc/ansible/hosts, you can run the advanced installation using the following playbook:
# ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml
If for any reason the installation fails, before re-running the installer, see Known Issues to check for any specific instructions or workarounds.
The installer caches playbook configuration values for 10 minutes, by default. If you change any system, network, or inventory configuration, and then re-run the installer within that 10 minute period, the new values are not used, and the previous values are used instead. You can delete the contents of the cache, which is defined by the fact_caching_connection
value in the /etc/ansible/ansible.cfg file.
Due to a known issue, after running the installation, if NFS volumes are provisioned for any component, the following directories might be created whether their components are being deployed to NFS volumes or not:
- /exports/logging-es
- /exports/logging-es-ops/
- /exports/metrics/
- /exports/prometheus
- /exports/prometheus-alertbuffer/
- /exports/prometheus-alertmanager/
You can delete these directories after installation, as needed.
2.6.8. Verifying the Installation
After the installation completes:
Verify that the master is started and nodes are registered and reporting in Ready status. On the master host, run the following as root:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
To verify that the web console is installed correctly, use the master host name and the console port number to access the console with a web browser.
For example, for a master host with a hostname of
master.openshift.com
and using the default port of8443
, the web console would be found at:https://master.openshift.com:8443/console
Now that the install has been verified, run the following command on each master and node host to add the atomic-openshift packages back to the list of yum excludes on the host:
# atomic-openshift-excluder exclude
The default port for the console is 8443
. If this was changed during the installation, the port can be found at openshift_master_console_port in the /etc/ansible/hosts file.
Multiple etcd Hosts
If you installed multiple etcd hosts:
First, verify that the etcd package, which provides the
etcdctl
command, is installed:# yum install etcd
On a etcd host, verify the etcd cluster health, substituting for the FQDNs of your etcd hosts in the following:
# etcdctl -C \ https://etcd1.example.com:2379,https://etcd2.example.com:2379,https://etcd3.example.com:2379 \ --ca-file=/etc/origin/master/master.etcd-ca.crt \ --cert-file=/etc/origin/master/master.etcd-client.crt \ --key-file=/etc/origin/master/master.etcd-client.key cluster-health
Also verify the member list is correct:
# etcdctl -C \ https://etcd1.example.com:2379,https://etcd2.example.com:2379,https://etcd3.example.com:2379 \ --ca-file=/etc/origin/master/master.etcd-ca.crt \ --cert-file=/etc/origin/master/master.etcd-client.crt \ --key-file=/etc/origin/master/master.etcd-client.key member list
Multiple Masters Using HAProxy
If you installed multiple masters using HAProxy as a load balancer, browse to the following URL according to your [lb] section definition and check HAProxy’s status:
http://<lb_hostname>:9000
You can verify your installation by consulting the HAProxy Configuration documentation.
2.6.9. Optionally Securing Builds
Running docker build
is a privileged process, so the container has more access to the node than might be considered acceptable in some multi-tenant environments. If you do not trust your users, you can use a more secure option at the time of installation. Disable Docker builds on the cluster and require that users build images outside of the cluster. See Securing Builds by Strategy for more information on this optional process.
2.6.10. Uninstalling OpenShift Container Platform
You can uninstall OpenShift Container Platform hosts in your cluster by running the uninstall.yml playbook. This playbook deletes OpenShift Container Platform content installed by Ansible, including:
- Configuration
- Containers
- Default templates and image streams
- Images
- RPM packages
The playbook will delete content for any hosts defined in the inventory file that you specify when running the playbook. If you want to uninstall OpenShift Container Platform across all hosts in your cluster, run the playbook using the inventory file you used when installing OpenShift Container Platform initially or ran most recently:
# ansible-playbook [-i /path/to/file] \ /usr/share/ansible/openshift-ansible/playbooks/adhoc/uninstall.yml
2.6.10.1. Uninstalling Nodes
You can also uninstall node components from specific hosts using the uninstall.yml playbook while leaving the remaining hosts and cluster alone:
This method should only be used when attempting to uninstall specific node hosts and not for specific masters or etcd hosts, which would require further configuration changes within the cluster.
- First follow the steps in Deleting Nodes to remove the node object from the cluster, then continue with the remaining steps in this procedure.
Create a different inventory file that only references those hosts. For example, to only delete content from one node:
[OSEv3:children] nodes 1 [OSEv3:vars] ansible_ssh_user=root deployment_type=openshift-enterprise [nodes] node3.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" 2
Specify that new inventory file using the
-i
option when running the uninstall.yml playbook:# ansible-playbook -i /path/to/new/file \ /usr/share/ansible/openshift-ansible/playbooks/adhoc/uninstall.yml
When the playbook completes, all OpenShift Container Platform content should be removed from any specified hosts.
2.6.11. Known Issues
- On failover in multiple master clusters, it is possible for the controller manager to overcorrect, which causes the system to run more pods than what was intended. However, this is a transient event and the system does correct itself over time. See https://github.com/kubernetes/kubernetes/issues/10030 for details.
- On failure of the Ansible installer, you must start from a clean operating system installation. If you are using virtual machines, start from a fresh image. If you are using bare metal machines, see Uninstalling OpenShift Container Platform for instructions.
2.6.12. What’s Next?
Now that you have a working OpenShift Container Platform instance, you can:
- Configure authentication; by default, authentication is set to Deny All.
- Deploy an integrated Docker registry.
- Deploy a router.
2.7. Disconnected Installation
2.7.1. Overview
Frequently, portions of a datacenter may not have access to the Internet, even via proxy servers. Installing OpenShift Container Platform in these environments is considered a disconnected installation.
An OpenShift Container Platform disconnected installation differs from a regular installation in two primary ways:
- The OpenShift Container Platform software channels and repositories are not available via Red Hat’s content distribution network.
- OpenShift Container Platform uses several containerized components. Normally, these images are pulled directly from Red Hat’s Docker registry. In a disconnected environment, this is not possible.
A disconnected installation ensures the OpenShift Container Platform software is made available to the relevant servers, then follows the same installation process as a standard connected installation. This topic additionally details how to manually download the container images and transport them onto the relevant servers.
Once installed, in order to use OpenShift Container Platform, you will need source code in a source control repository (for example, Git). This topic assumes that an internal Git repository is available that can host source code and this repository is accessible from the OpenShift Container Platform nodes. Installing the source control repository is outside the scope of this document.
Also, when building applications in OpenShift Container Platform, your build may have some external dependencies, such as a Maven Repository or Gem files for Ruby applications. For this reason, and because they might require certain tags, many of the Quickstart templates offered by OpenShift Container Platform may not work on a disconnected environment. However, while Red Hat container images try to reach out to external repositories by default, you can configure OpenShift Container Platform to use your own internal repositories. For the purposes of this document, we assume that such internal repositories already exist and are accessible from the OpenShift Container Platform nodes hosts. Installing such repositories is outside the scope of this document.
You can also have a Red Hat Satellite server that provides access to Red Hat content via an intranet or LAN. For environments with Satellite, you can synchronize the OpenShift Container Platform software onto the Satellite for use with the OpenShift Container Platform servers.
Red Hat Satellite 6.1 also introduces the ability to act as a Docker registry, and it can be used to host the OpenShift Container Platform containerized components. Doing so is outside of the scope of this document.
2.7.2. Prerequisites
This document assumes that you understand OpenShift Container Platform’s overall architecture and that you have already planned out what the topology of your environment will look like.
2.7.3. Required Software and Components
In order to pull down the required software repositories and container images, you will need a Red Hat Enterprise Linux (RHEL) 7 server with access to the Internet and at least 100GB of additional free space. All steps in this section should be performed on the Internet-connected server as the root system user.
2.7.3.1. Syncing Repositories
Before you sync with the required repositories, you may need to import the appropriate GPG key:
# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
If the key is not imported, the indicated package is deleted after syncing the repository.
To sync the required repositories:
Register the server with the Red Hat Customer Portal. You must use the login and password associated with the account that has access to the OpenShift Container Platform subscriptions:
# subscription-manager register
Attach to a subscription that provides OpenShift Container Platform channels. You can find the list of available subscriptions using:
# subscription-manager list --available --matches '*OpenShift*'
Then, find the pool ID for the subscription that provides OpenShift Container Platform, and attach it:
# subscription-manager attach --pool=<pool_id> # subscription-manager repos --disable="*" # subscription-manager repos \ --enable="rhel-7-server-rpms" \ --enable="rhel-7-server-extras-rpms" \ --enable="rhel-7-server-ose-3.3-rpms"
The
yum-utils
command provides the reposync utility, which lets you mirror yum repositories, andcreaterepo
can create a usableyum
repository from a directory:# yum -y install yum-utils createrepo docker git
You will need up to 110GB of free space in order to sync the software. Depending on how restrictive your organization’s policies are, you could re-connect this server to the disconnected LAN and use it as the repository server. You could use USB-connected storage and transport the software to another server that will act as the repository server. This topic covers these options.
Make a path to where you want to sync the software (either locally or on your USB or other device):
# mkdir -p </path/to/repos>
Sync the packages and create the repository for each of them. You will need to modify the command for the appropriate path you created above:
# for repo in \ rhel-7-server-rpms rhel-7-server-extras-rpms \ rhel-7-server-ose-3.3-rpms do reposync --gpgcheck -lm --repoid=${repo} --download_path=/path/to/repos createrepo -v </path/to/repos/>${repo} -o </path/to/repos/>${repo} done
2.7.3.2. Syncing Images
To sync the container images:
Start the Docker daemon:
# systemctl start docker
Pull all of the required OpenShift Container Platform containerized components. Replace
<tag>
withv3.3.1.25
for the latest version.# docker pull registry.access.redhat.com/openshift3/ose-haproxy-router:<tag> # docker pull registry.access.redhat.com/openshift3/ose-deployer:<tag> # docker pull registry.access.redhat.com/openshift3/ose-recycler:<tag> # docker pull registry.access.redhat.com/openshift3/ose-sti-builder:<tag> # docker pull registry.access.redhat.com/openshift3/ose-docker-builder:<tag> # docker pull registry.access.redhat.com/openshift3/ose-pod:<tag> # docker pull docker.io/openshift/hello-openshift:latest # docker pull registry.access.redhat.com/openshift3/ose-docker-registry:<tag>
Pull all of the required OpenShift Container Platform containerized components for the additional centralized log aggregation and metrics aggregation components. Replace
<tag>
with3.3.1
for the latest version.# docker pull registry.access.redhat.com/openshift3/logging-deployer:<tag> # docker pull registry.access.redhat.com/openshift3/logging-elasticsearch:<tag> # docker pull registry.access.redhat.com/openshift3/logging-kibana:<tag> # docker pull registry.access.redhat.com/openshift3/logging-fluentd:<tag> # docker pull registry.access.redhat.com/openshift3/logging-curator:<tag> # docker pull registry.access.redhat.com/openshift3/logging-auth-proxy:<tag> # docker pull registry.access.redhat.com/openshift3/metrics-deployer:<tag> # docker pull registry.access.redhat.com/openshift3/metrics-hawkular-metrics:<tag> # docker pull registry.access.redhat.com/openshift3/metrics-cassandra:<tag> # docker pull registry.access.redhat.com/openshift3/metrics-heapster:<tag>
Pull the Red Hat-certified Source-to-Image (S2I) builder images that you intend to use in your OpenShift environment. You can pull the following images:
- jboss-eap70-openshift
- jboss-amq-62
- jboss-datagrid65-openshift
- jboss-decisionserver62-openshift
- jboss-eap64-openshift
- jboss-eap70-openshift
- jboss-webserver30-tomcat7-openshift
- jboss-webserver30-tomcat8-openshift
- mongodb
- mysql
- nodejs
- perl
- php
- postgresql
- python
- redhat-sso70-openshift
ruby
Make sure to indicate the correct tag specifying the desired version number. For example, to pull both the previous and latest version of the Tomcat image:
# docker pull \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:latest # docker pull \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:1.1
If you are using a stand-alone registry or plan to enable the registry console with the integrated registry, you must pull the registry-console image.
Replace
<tag>
with3.3
for the latest version.# docker pull registry.access.redhat.com/openshift3/registry-console:<tag>
2.7.3.3. Preparing Images for Export
Container images can be exported from a system by first saving them to a tarball and then transporting them:
Make and change into a repository home directory:
# mkdir </path/to/repos/images> # cd </path/to/repos/images>
Export the OpenShift Container Platform containerized components:
# docker save -o ose3-images.tar \ registry.access.redhat.com/openshift3/ose-haproxy-router \ registry.access.redhat.com/openshift3/ose-deployer \ registry.access.redhat.com/openshift3/ose-recycler \ registry.access.redhat.com/openshift3/ose-sti-builder \ registry.access.redhat.com/openshift3/ose-docker-builder \ registry.access.redhat.com/openshift3/ose-pod \ docker.io/openshift/hello-openshift \ registry.access.redhat.com/openshift3/ose-docker-registry
If you synchronized the metrics and log aggregation images, export:
# docker save -o ose3-logging-metrics-images.tar \ registry.access.redhat.com/openshift3/logging-deployer \ registry.access.redhat.com/openshift3/logging-elasticsearch \ registry.access.redhat.com/openshift3/logging-kibana \ registry.access.redhat.com/openshift3/logging-fluentd \ registry.access.redhat.com/openshift3/logging-auth-proxy \ registry.access.redhat.com/openshift3/metrics-deployer \ registry.access.redhat.com/openshift3/metrics-hawkular-metrics \ registry.access.redhat.com/openshift3/metrics-cassandra \ registry.access.redhat.com/openshift3/metrics-heapster
Export the S2I builder images that you synced in the previous section. For example, if you synced only the Tomcat image:
# docker save -o ose3-builder-images.tar \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:latest \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:1.1
2.7.4. Repository Server
During the installation (and for later updates, should you so choose), you will need a webserver to host the repositories. RHEL 7 can provide the Apache webserver.
Option 1: Re-configuring as a Web server
If you can re-connect the server where you synchronized the software and images to your LAN, then you can simply install Apache on the server:
# yum install httpd
Skip to Placing the Software.
Option 2: Building a Repository Server
If you need to build a separate server to act as the repository server, install a new RHEL 7 system with at least 110GB of space. On this repository server during the installation, make sure you select the Basic Web Server option.
2.7.4.1. Placing the Software
If necessary, attach the external storage, and then copy the repository files into Apache’s root folder. Note that the below copy step (
cp -a
) should be substituted with move (mv
) if you are repurposing the server you used to sync:# cp -a /path/to/repos /var/www/html/ # chmod -R +r /var/www/html/repos # restorecon -vR /var/www/html
Add the firewall rules:
# firewall-cmd --permanent --add-service=http # firewall-cmd --reload
Enable and start Apache for the changes to take effect:
# systemctl enable httpd # systemctl start httpd
2.7.5. OpenShift Container Platform Systems
2.7.5.1. Building Your Hosts
At this point you can perform the initial creation of the hosts that will be part of the OpenShift Container Platform environment. It is recommended to use the latest version of RHEL 7 and to perform a minimal installation. You will also want to pay attention to the other OpenShift Container Platform-specific prerequisites.
Once the hosts are initially built, the repositories can be set up.
2.7.5.2. Connecting the Repositories
On all of the relevant systems that will need OpenShift Container Platform software components, create the required repository definitions. Place the following text in the /etc/yum.repos.d/ose.repo file, replacing <server_IP>
with the IP or host name of the Apache server hosting the software repositories:
[rhel-7-server-rpms] name=rhel-7-server-rpms baseurl=http://<server_IP>/repos/rhel-7-server-rpms enabled=1 gpgcheck=0 [rhel-7-server-extras-rpms] name=rhel-7-server-extras-rpms baseurl=http://<server_IP>/repos/rhel-7-server-extras-rpms enabled=1 gpgcheck=0 [rhel-7-server-ose-3.3-rpms] name=rhel-7-server-ose-3.3-rpms baseurl=http://<server_IP>/repos/rhel-7-server-ose-3.3-rpms enabled=1 gpgcheck=0
2.7.5.3. Host Preparation
At this point, the systems are ready to continue to be prepared following the OpenShift Container Platform documentation.
Skip the section titled Host Registration and start with Installing Base Packages.
2.7.6. Installing OpenShift Container Platform
2.7.6.1. Importing OpenShift Container Platform Containerized Components
To import the relevant components, securely copy the images from the connected host to the individual OpenShift Container Platform hosts:
# scp /var/www/html/repos/images/ose3-images.tar root@<openshift_host_name>: # ssh root@<openshift_host_name> "docker load -i ose3-images.tar"
If you prefer, you could use wget
on each OpenShift Container Platform host to fetch the tar file, and then perform the Docker import command locally. Perform the same steps for the metrics and logging images, if you synchronized them.
On the host that will act as an OpenShift Container Platform master, copy and import the builder images:
# scp /var/www/html/images/ose3-builder-images.tar root@<openshift_master_host_name>: # ssh root@<openshift_master_host_name> "docker load -i ose3-builder-images.tar"
2.7.6.2. Running the OpenShift Container Platform Installer
You can now choose to follow the quick or advanced OpenShift Container Platform installation instructions in the documentation.
2.7.6.3. Creating the Internal Docker Registry
You now need to create the internal Docker registry.
If you want to install a stand-alone registry, you must pull the registry-console container image and set deployment_subtype=registry
in the inventory file.
2.7.7. Post-Installation Changes
In one of the previous steps, the S2I images were imported into the Docker daemon running on one of the OpenShift Container Platform master hosts. In a connected installation, these images would be pulled from Red Hat’s registry on demand. Since the Internet is not available to do this, the images must be made available in another Docker registry.
OpenShift Container Platform provides an internal registry for storing the images that are built as a result of the S2I process, but it can also be used to hold the S2I builder images. The following steps assume you did not customize the service IP subnet (172.30.0.0/16) or the Docker registry port (5000).
2.7.7.1. Re-tagging S2I Builder Images
On the master host where you imported the S2I builder images, obtain the service address of your Docker registry that you installed on the master:
# export REGISTRY=$(oc get service docker-registry -t '{{.spec.clusterIP}}{{"\n"}}')
Next, tag all of the builder images that you synced and exported before pushing them into the OpenShift Container Platform Docker registry. For example, if you synced and exported only the Tomcat image:
# docker tag \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:1.1 \ $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:1.1 # docker tag \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:latest \ $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:1.2 # docker tag \ registry.access.redhat.com/jboss-webserver-3/webserver30-tomcat7-openshift:latest \ $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:latest
2.7.7.2. Configuring a Registry Location
If you are using an image registry other than the default at registry.access.redhat.com
, specify the desired registry within the /etc/ansible/hosts file.
oreg_url=example.com/openshift3/ose-${component}:${version} openshift_examples_modify_imagestreams=true
Depending on your registry, you may need to configure:
openshift_docker_additional_registries=example.com openshift_docker_insecure_registries=example.com
Variable | Purpose |
---|---|
|
Set to the alternate image location. Necessary if you are not using the default registry at |
|
Set to |
|
Set |
|
Set |
2.7.7.3. Creating an Administrative User
Pushing the container images into OpenShift Container Platform’s Docker registry requires a user with cluster-admin privileges. Because the default OpenShift Container Platform system administrator does not have a standard authorization token, they cannot be used to log in to the Docker registry.
To create an administrative user:
Create a new user account in the authentication system you are using with OpenShift Container Platform. For example, if you are using local
htpasswd
-based authentication:# htpasswd -b /etc/openshift/openshift-passwd <admin_username> <password>
The external authentication system now has a user account, but a user must log in to OpenShift Container Platform before an account is created in the internal database. Log in to OpenShift Container Platform for this account to be created. This assumes you are using the self-signed certificates generated by OpenShift Container Platform during the installation:
# oc login --certificate-authority=/etc/origin/master/ca.crt \ -u <admin_username> https://<openshift_master_host>:8443
Get the user’s authentication token:
# MYTOKEN=$(oc whoami -t) # echo $MYTOKEN iwo7hc4XilD2KOLL4V1O55ExH2VlPmLD-W2-JOd6Fko
2.7.7.4. Modifying the Security Policies
Using
oc login
switches to the new user. Switch back to the OpenShift Container Platform system administrator in order to make policy changes:# oc login -u system:admin
In order to push images into the OpenShift Container Platform Docker registry, an account must have the
image-builder
security role. Add this to your OpenShift Container Platform administrative user:# oadm policy add-role-to-user system:image-builder <admin_username>
Next, add the administrative role to the user in the openshift project. This allows the administrative user to edit the openshift project, and, in this case, push the container images:
# oadm policy add-role-to-user admin <admin_username> -n openshift
2.7.7.5. Editing the Image Stream Definitions
The openshift project is where all of the image streams for builder images are created by the installer. They are loaded by the installer from the /usr/share/openshift/examples directory. Change all of the definitions by deleting the image streams which had been loaded into OpenShift Container Platform’s database, then re-create them:
Delete the existing image streams:
# oc delete is -n openshift --all
Make a backup of the files in /usr/share/openshift/examples/ if you desire. Next, edit the file image-streams-rhel7.json in the /usr/share/openshift/examples/image-streams folder. You will find an image stream section for each of the builder images. Edit the
spec
stanza to point to your internal Docker registry.For example, change:
"spec": { "dockerImageRepository": "registry.access.redhat.com/rhscl/mongodb-26-rhel7",
to:
"spec": { "dockerImageRepository": "172.30.69.44:5000/openshift/mongodb-26-rhel7",
In the above, the repository name was changed from rhscl to openshift. You will need to ensure the change, regardless of whether the repository is rhscl, openshift3, or another directory. Every definition should have the following format:
<registry_ip>:5000/openshift/<image_name>
Repeat this change for every image stream in the file. Ensure you use the correct IP address that you determined earlier. When you are finished, save and exit. Repeat the same process for the JBoss image streams in the /usr/share/openshift/examples/xpaas-streams/jboss-image-streams.json file.
Load the updated image stream definitions:
# oc create -f /usr/share/openshift/examples/image-streams/image-streams-rhel7.json -n openshift # oc create -f /usr/share/openshift/examples/xpaas-streams/jboss-image-streams.json -n openshift
2.7.7.6. Loading the Container Images
At this point the system is ready to load the container images.
Log in to the Docker registry using the token and registry service IP obtained earlier:
# docker login -u adminuser -e mailto:adminuser@abc.com \ -p $MYTOKEN $REGISTRY:5000
Push the Docker images:
# docker push $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:1.1 # docker push $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:1.2 # docker push $REGISTRY:5000/openshift/webserver30-tomcat7-openshift:latest
Verify that all the image streams now have the tags populated:
# oc get imagestreams -n openshift NAME DOCKER REPO TAGS UPDATED jboss-webserver30-tomcat7-openshift $REGISTRY/jboss-webserver-3/webserver30-jboss-tomcat7-openshift 1.1,1.1-2,1.1-6 + 2 more... 2 weeks ago ...
2.7.8. Installing a Router
At this point, the OpenShift Container Platform environment is almost ready for use. It is likely that you will want to install and configure a router.
2.8. Installing a Stand-alone Deployment of OpenShift Container Registry
2.8.1. About OpenShift Container Registry
OpenShift Container Platform is a fully-featured enterprise solution that includes an integrated container registry called OpenShift Container Registry (OCR). Alternatively, instead of deploying OpenShift Container Platform as a full PaaS environment for developers, you can install OCR as a stand-alone container registry to run on-premise or in the cloud.
When installing a stand-alone deployment of OCR, a cluster of masters and nodes is still installed, similar to a typical OpenShift Container Platform installation. Then, the container registry is deployed to run on the cluster. This stand-alone deployment option is useful for administrators that want a container registry, but do not require the full OpenShift Container Platform environment that includes the developer-focused web console and application build and deployment tools.
OCR has replaced the upstream Atomic Registry project, which was a different implementation that used a non-Kubernetes deployment method that leveraged systemd
and local configuration files to manage services.
OCR provides the following capabilities:
- A user-focused registry web console.
- Secured traffic by default, served via TLS.
- Global identity provider authentication.
- A project namespace model to enable teams to collaborate through role-based access control (RBAC) authorization.
- A Kubernetes-based cluster to manage services.
- An image abstraction called image streams to enhance image management.
Administrators may want to deploy a stand-alone OCR to manage a registry separately that supports multiple OpenShift Container Platform clusters. A stand-alone OCR also enables administrators to separate their registry to satisfy their own security or compliance requirements.
2.8.2. Minimum Hardware Requirements
Installing a stand-alone OCR has the following hardware requirements:
- Physical or virtual system, or an instance running on a public or private IaaS.
- Base OS: RHEL 7.3 with the "Minimal" installation option and the latest packages from the RHEL 7 Extras channel, or RHEL Atomic Host 7.3.2 or later. RHEL 7.2 is also supported using Docker 1.12 and its dependencies.
- NetworkManager 1.0 or later
- 2 vCPU.
- Minimum 16 GB RAM.
- Minimum 15 GB hard disk space for the file system containing /var/.
- An additional minimum 15 GB unallocated space to be used for Docker’s storage back end; see Configuring Docker Storage for details.
OpenShift Container Platform only supports servers with x86_64 architecture.
Meeting the /var/ file system sizing requirements in RHEL Atomic Host requires making changes to the default configuration. See Managing Storage in Red Hat Enterprise Linux Atomic Host for instructions on configuring this during or after installation.
2.8.3. Supported System Topologies
The following system topologies are supported for stand-alone OCR:
All-in-one | A single host that includes the master, node, etcd, and registry components. |
Multiple Masters (Highly-Available) | Three hosts with all components included on each (master, node, etcd, and registry), with the masters configured for native high-availability. |
2.8.4. Host Preparation
Before installing stand-alone OCR, all of the same steps detailed in the Host Preparation topic for installing a full OpenShift Container Platform PaaS must be performed. This includes registering and subscribing the host(s) to the proper repositories, installing or updating certain packages, and setting up Docker and its storage requirements.
Follow the steps in the Host Preparation topic, then continue to Installation Methods.
2.8.5. Installation Methods
To install a stand-alone registry, use either of the standard installation methods (quick or advanced) used to install any variant of OpenShift Container Platform.
2.8.5.1. Quick Installation for Stand-alone OpenShift Container Registry
When using the quick installation method to install stand-alone OCR, start the interactive installation by running:
$ atomic-openshift-installer install
Then follow the on-screen instructions to install a new registry. The installation questions will be largely the same as if you were installing a full OpenShift Container Platform PaaS, but when you reach the following screen:
Which variant would you like to install? (1) OpenShift Container Platform 3.3 (2) Registry 3.3
Be sure to choose 2
to follow the registry installation path.
For further usage details on the quick installer in general, see the full topic at Quick Installation.
2.8.5.2. Advanced Installation for Stand-alone OpenShift Container Registry
When using the advanced installation method to install stand-alone OCR, use the same steps for installing a full OpenShift Container Platform PaaS using Ansible described in the full Advanced Installation topic. The main difference is that you must set deployment_subtype=registry
in the inventory file within the [OSEv3:vars]
section for the playbooks to follow the registry installation path.
See the following example inventory files for the different supported system topologies:
All-in-one Stand-alone OpenShift Container Registry Inventory File
# Create an OSEv3 group that contains the masters and nodes groups [OSEv3:children] masters nodes # Set variables common for all OSEv3 hosts [OSEv3:vars] # SSH user, this user should allow ssh based auth without requiring a password ansible_ssh_user=root openshift_master_default_subdomain=apps.test.example.com # If ansible_ssh_user is not root, ansible_become must be set to true #ansible_become=true deployment_type=openshift-enterprise deployment_subtype=registry 1 # uncomment the following to enable htpasswd authentication; defaults to DenyAllPasswordIdentityProvider #openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}] # host group for masters [masters] registry.example.com # host group for nodes, includes region info [nodes] registry.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" openshift_schedulable=true 2
Multiple Masters (Highly-Available) Stand-alone OpenShift Container Registry Inventory File
# Create an OSEv3 group that contains the master, nodes, etcd, and lb groups.
# The lb group lets Ansible configure HAProxy as the load balancing solution.
# Comment lb out if your load balancer is pre-configured.
[OSEv3:children]
masters
nodes
etcd
lb
# Set variables common for all OSEv3 hosts
[OSEv3:vars]
ansible_ssh_user=root
deployment_type=openshift-enterprise
deployment_subtype=registry 1
openshift_master_default_subdomain=apps.test.example.com
# Uncomment the following to enable htpasswd authentication; defaults to
# DenyAllPasswordIdentityProvider.
#openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}]
# Native high availability cluster method with optional load balancer.
# If no lb group is defined installer assumes that a load balancer has
# been preconfigured. For installation the value of
# openshift_master_cluster_hostname must resolve to the load balancer
# or to one or all of the masters defined in the inventory if no load
# balancer is present.
openshift_master_cluster_method=native
openshift_master_cluster_hostname=openshift-internal.example.com
openshift_master_cluster_public_hostname=openshift-cluster.example.com
# apply updated node defaults
openshift_node_kubelet_args={'pods-per-core': ['10'], 'max-pods': ['250'], 'image-gc-high-threshold': ['90'], 'image-gc-low-threshold': ['80']}
# override the default controller lease ttl
#osm_controller_lease_ttl=30
# enable ntp on masters to ensure proper failover
openshift_clock_enabled=true
# host group for masters
[masters]
master1.example.com
master2.example.com
master3.example.com
# host group for etcd
[etcd]
etcd1.example.com
etcd2.example.com
etcd3.example.com
# Specify load balancer host
[lb]
lb.example.com
# host group for nodes, includes region info
[nodes]
master[1:3].example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" openshift_schedulable=true
node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}"
node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}"
- 1
- Set
deployment_subtype=registry
to ensure installation of stand-alone OCR and not a full OpenShift Container Platform environment.
After you have configured Ansible by defining an inventory file in /etc/ansible/hosts, you can run the advanced installation using the following playbook:
# ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml
For more detailed usage information on the advanced installation method, including a comprehensive list of available Ansible variables, see the full topic at Advanced Installation.
Chapter 3. Setting up the Registry
3.1. Registry Overview
3.1.1. About the Registry
OpenShift Container Platform can build container images from your source code, deploy them, and manage their lifecycle. To enable this, OpenShift Container Platform provides an internal, integrated Docker registry that can be deployed in your OpenShift Container Platform environment to locally manage images.
3.1.2. Integrated or Stand-alone Registries
During an initial installation of a full OpenShift Container Platform cluster, it is likely that the registry was deployed automatically during the installation process. If it was not, or if you want to further customize the configuration of your registry, see Deploying a Registry on Existing Clusters.
While it can be deployed to run as an integrated part of your full OpenShift Container Platform cluster, the OpenShift Container Platform registry can alternatively be installed separately as a stand-alone container image registry.
To install a stand-alone registry, follow Installing a Stand-alone Registry. This installation path deploys an all-in-one cluster running a registry and specialized web console.
3.2. Deploying a Registry on Existing Clusters
3.2.1. Overview
If the integrated registry was not previously deployed automatically during the initial installation of your OpenShift Container Platform cluster, or if it is no longer running successfully and you need to redeploy it on your existing cluster, see the following sections for options on deploying a new registry.
This topic is not required if you installed a stand-alone registry.
3.2.2. Deploying the Registry
To deploy the integrated Docker registry, use the oadm registry
command as a user with cluster administrator privileges. For example:
$ oadm registry --config=/etc/origin/master/admin.kubeconfig \1 --service-account=registry \2 --images='registry.access.redhat.com/openshift3/ose-${component}:${version}' 3
This creates a service and a deployment configuration, both called docker-registry. Once deployed successfully, a pod is created with a name similar to docker-registry-1-cpty9.
To see a full list of options that you can specify when creating the registry:
$ oadm registry --help
3.2.3. Deploying the Registry as a DaemonSet
Use the oadm registry
command to deploy the registry as a DaemonSet
with the --daemonset
option.
Daemonsets ensure that when nodes are created, they contain copies of a specified pod. When the nodes are removed, the pods are garbage collected.
For more information on DaemonSets
, see Using Daemonsets.
3.2.4. Registry Compute Resources
By default, the registry is created with no settings for compute resource requests or limits. For production, it is highly recommended that the deployment configuration for the registry be updated to set resource requests and limits for the registry pod. Otherwise, the registry pod will be considered a BestEffort pod.
See Compute Resources for more information on configuring requests and limits.
3.2.5. Storage for the Registry
The registry stores container images and metadata. If you simply deploy a pod with the registry, it uses an ephemeral volume that is destroyed if the pod exits. Any images anyone has built or pushed into the registry would disappear.
This section lists the supported registry storage drivers.
The following list includes storage drivers that need to be configured in the registry’s configuration file:
- Filesystem. Filesystem is the default and does not need to be configured.
- S3. Learn more about CloudFront configuration.
- OpenStack Swift
- Google Cloud Storage (GCS)
- Microsoft Azure
- Aliyun OSS
General registry storage configuration options are supported.
The following storage options need to be configured through the filesystem driver:
For more information on supported persistent storage drivers, see Configuring Persistent Storage and Persistent Storage Examples.
3.2.5.1. Production Use
For production use, attach a remote volume or define and use the persistent storage method of your choice.
For example, to use an existing persistent volume claim:
$ oc volume deploymentconfigs/docker-registry --add --name=registry-storage -t pvc \ --claim-name=<pvc_name> --overwrite
See Known Issues if using a scaled registry with a shared NFS volume.
3.2.5.1.1. Use Amazon S3 as a Storage Back-end
There is also an option to use Amazon Simple Storage Service storage with the internal Docker registry. It is a secure cloud storage manageable through AWS Management Console. To use it, the registry’s configuration file must be manually edited and mounted to the registry pod. However, before you start with the configuration, look at upstream’s recommended steps.
Take a default YAML configuration file as a base and replace the filesystem entry in the storage section with s3 entry such as below. The resulting storage section may look like this:
storage: cache: layerinfo: inmemory delete: enabled: true s3: accesskey: awsaccesskey 1 secretkey: awssecretkey 2 region: us-west-1 regionendpoint: http://myobjects.local bucket: bucketname encrypt: true keyid: mykeyid secure: true v4auth: false chunksize: 5242880 rootdirectory: /s3/object/name/prefix
All of the s3 configuration options are documented in upstream’s driver reference documentation.
Overriding the registry configuration will take you through the additional steps on mounting the configuration file into pod.
When the registry runs on the S3 storage back-end, there are reported issues.
3.2.5.2. Non-Production Use
For non-production use, you can use the --mount-host=<path>
option to specify a directory for the registry to use for persistent storage. The registry volume is then created as a host-mount at the specified <path>
.
The --mount-host
option mounts a directory from the node on which the registry container lives. If you scale up the docker-registry deployment configuration, it is possible that your registry pods and containers will run on different nodes, which can result in two or more registry containers, each with its own local storage. This will lead to unpredictable behavior, as subsequent requests to pull the same image repeatedly may not always succeed, depending on which container the request ultimately goes to.
The --mount-host
option requires that the registry container run in privileged mode. This is automatically enabled when you specify --mount-host
. However, not all pods are allowed to run privileged containers by default. If you still want to use this option, create the registry and specify that it use the registry service account that was created during installation:
$ oadm registry --service-account=registry \ --config=/etc/origin/master/admin.kubeconfig \ --images='registry.access.redhat.com/openshift3/ose-${component}:${version}' \ --mount-host=<path>
The Docker registry pod runs as user 1001. This user must be able to write to the host directory. You may need to change directory ownership to user ID 1001 with this command:
$ sudo chown 1001:root <path>
3.2.6. Enabling the Registry Console
OpenShift Container Platform provides a web-based interface to the integrated registry. This registry console is an optional component for browsing and managing images. It is deployed as a stateless service running as a pod.
If you installed OpenShift Container Platform as a stand-alone registry, the registry console is already deployed and secured automatically during installation.
If Cockpit is already running, you’ll need to shut it down before proceeding in order to avoid a port conflict (9090 by default) with the registry console.
3.2.6.1. Deploying the Registry Console
You must first have exposed the registry.
Create a passthrough route in the default project. You will need this when creating the registry console application in the next step.
$ oc create route passthrough --service registry-console \ --port registry-console \ -n default
Deploy the registry console application. Replace
<openshift_oauth_url>
with the URL of the OpenShift Container Platform OAuth provider, which is typically the master.$ oc new-app -n default --template=registry-console -p \ OPENSHIFT_OAUTH_PROVIDER_URL="https://<openshift_oauth_url>:8443",REGISTRY_HOST=$(oc get route docker-registry -n default --template='{{ .spec.host }}'),COCKPIT_KUBE_URL=$(oc get route registry-console -n default --template='https://{{ .spec.host }}')
If the redirection URL is wrong when you are trying to log in to the registry console, check your OAuth client with oc get oauthclients
.
- Finally, use a web browser to view the console using the route URI.
3.2.6.2. Securing the Registry Console
By default, the registry console generates self-signed TLS certificates if deployed manually per the steps in Deploying the Registry Console. See Troubleshooting the Registry Console for more information.
Use the following steps to add your organization’s signed certificates as a secret volume. This assumes your certificates are available on the oc
client host.
Create a .cert file containing the certificate and key. Format the file with:
- One or more BEGIN CERTIFICATE blocks for the server certificate and the intermediate certificate authorities
A block containing a BEGIN PRIVATE KEY or similar for the key. The key must not be encrypted
For example:
-----BEGIN CERTIFICATE----- MIIDUzCCAjugAwIBAgIJAPXW+CuNYS6QMA0GCSqGSIb3DQEBCwUAMD8xKTAnBgNV BAoMIGI0OGE2NGNkNmMwNTQ1YThhZTgxOTEzZDE5YmJjMmRjMRIwEAYDVQQDDAls ... -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- MIIDUzCCAjugAwIBAgIJAPXW+CuNYS6QMA0GCSqGSIb3DQEBCwUAMD8xKTAnBgNV BAoMIGI0OGE2NGNkNmMwNTQ1YThhZTgxOTEzZDE5YmJjMmRjMRIwEAYDVQQDDAls ... -----END CERTIFICATE----- -----BEGIN PRIVATE KEY----- MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCyOJ5garOYw0sm 8TBCDSqQ/H1awGMzDYdB11xuHHsxYS2VepPMzMzryHR137I4dGFLhvdTvJUH8lUS ... -----END PRIVATE KEY-----
The secured registry should contain the following Subject Alternative Names (SAN) list:
Two service hostnames.
For example:
docker-registry.default.svc.cluster.local docker-registry.default.svc
Service IP address.
For example:
172.30.124.220
Use the following command to get the Docker registry service IP address:
oc get service docker-registry --template='{{.spec.clusterIP}}'
Public hostname.
For example:
docker-registry-default.apps.example.com
Use the following command to get the Docker registry public hostname:
oc get route docker-registry --template '{{.spec.host}}'
For example, the server certificate should contain SAN details similar to the following:
X509v3 Subject Alternative Name: DNS:docker-registry-public.openshift.com, DNS:docker-registry.default.svc, DNS:docker-registry.default.svc.cluster.local, DNS:172.30.2.98, IP Address:172.30.2.98
The registry console loads a certificate from the /etc/cockpit/ws-certs.d directory. It uses the last file with a .cert extension in alphabetical order. Therefore, the .cert file should contain at least two PEM blocks formatted in the OpenSSL style.
If no certificate is found, a self-signed certificate is created using the
openssl
command and stored in the 0-self-signed.cert file.
Create the secret:
$ oc secrets new console-secret \ /path/to/console.cert
Add the secrets to the registry-console deployment configuration:
$ oc volume dc/registry-console --add --type=secret \ --secret-name=console-secret -m /etc/cockpit/ws-certs.d
This triggers a new deployment of the registry console to include your signed certificates.
3.2.6.3. Troubleshooting the Registry Console
3.2.6.3.1. Debug Mode
The registry console debug mode is enabled using an environment variable. The following command redeploys the registry console in debug mode:
$ oc set env dc registry-console G_MESSAGES_DEBUG=cockpit-ws,cockpit-wrapper
Enabling debug mode allows more verbose logging to appear in the registry console’s pod logs.
3.2.6.3.2. Display SSL Certificate Path
To check which certificate the registry console is using, a command can be run from inside the console pod.
List the pods in the default project and find the registry console’s pod name:
$ oc get pods -n default NAME READY STATUS RESTARTS AGE registry-console-1-rssrw 1/1 Running 0 1d
Using the pod name from the previous command, get the certificate path that the cockpit-ws process is using. This example shows the console using the auto-generated certificate:
$ oc exec registry-console-1-rssrw remotectl certificate certificate: /etc/cockpit/ws-certs.d/0-self-signed.cert
3.3. Accessing the Registry
3.3.1. Viewing Logs
To view the logs for the Docker registry, use the oc logs
command with the deployment config:
$ oc logs dc/docker-registry 2015-05-01T19:48:36.300593110Z time="2015-05-01T19:48:36Z" level=info msg="version=v2.0.0+unknown" 2015-05-01T19:48:36.303294724Z time="2015-05-01T19:48:36Z" level=info msg="redis not configured" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002 2015-05-01T19:48:36.303422845Z time="2015-05-01T19:48:36Z" level=info msg="using inmemory layerinfo cache" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002 2015-05-01T19:48:36.303433991Z time="2015-05-01T19:48:36Z" level=info msg="Using OpenShift Auth handler" 2015-05-01T19:48:36.303439084Z time="2015-05-01T19:48:36Z" level=info msg="listening on :5000" instance.id=9ed6c43d-23ee-453f-9a4b-031fea646002
3.3.2. File Storage
Tag and image metadata is stored in OpenShift Container Platform, but the registry stores layer and signature data in a volume that is mounted into the registry container at /registry. As oc exec
does not work on privileged containers, to view a registry’s contents you must manually SSH into the node housing the registry pod’s container, then run docker exec
on the container itself:
List the current pods to find the pod name of your Docker registry:
# oc get pods
Then, use
oc describe
to find the host name for the node running the container:# oc describe pod <pod_name>
Log into the desired node:
# ssh node.example.com
List the running containers on the node host and identify the container ID for the Docker registry:
# docker ps | grep ose-docker-registry
List the registry contents using the
docker exec
command:# docker exec -it 4c01db0b339c find /registry /registry/docker /registry/docker/registry /registry/docker/registry/v2 /registry/docker/registry/v2/blobs 1 /registry/docker/registry/v2/blobs/sha256 /registry/docker/registry/v2/blobs/sha256/ed /registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810 /registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/data 2 /registry/docker/registry/v2/blobs/sha256/a3 /registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 /registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/data /registry/docker/registry/v2/blobs/sha256/f7 /registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845 /registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/data /registry/docker/registry/v2/repositories 3 /registry/docker/registry/v2/repositories/p1 /registry/docker/registry/v2/repositories/p1/pause 4 /registry/docker/registry/v2/repositories/p1/pause/_manifests /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256 /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures 5 /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256 /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810 /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/link 6 /registry/docker/registry/v2/repositories/p1/pause/_uploads 7 /registry/docker/registry/v2/repositories/p1/pause/_layers 8 /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256 /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4 /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/link 9 /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845 /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/link
- 1
- This directory stores all layers and signatures as blobs.
- 2
- This file contains the blob’s contents.
- 3
- This directory stores all the image repositories.
- 4
- This directory is for a single image repository p1/pause.
- 5
- This directory contains signatures for a particular image manifest revision.
- 6
- This file contains a reference back to a blob (which contains the signature data).
- 7
- This directory contains any layers that are currently being uploaded and staged for the given repository.
- 8
- This directory contains links to all the layers this repository references.
- 9
- This file contains a reference to a specific layer that has been linked into this repository via an image.
3.3.3. Accessing the Registry Directly
For advanced usage, you can access the registry directly to invoke docker
commands. This allows you to push images to or pull them from the integrated registry directly using operations like docker push
or docker pull
. To do so, you must be logged in to the registry using the docker login
command. The operations you can perform depend on your user permissions, as described in the following sections.
3.3.3.1. User Prerequisites
To access the registry directly, the user that you use must satisfy the following, depending on your intended usage:
For any direct access, you must have a regular user, if one does not already exist, for your preferred identity provider. A regular user can generate an access token required for logging in to the registry. System users, such as system:admin, cannot obtain access tokens and, therefore, cannot access the registry directly.
For example, if you are using
HTPASSWD
authentication, you can create one using the following command:# htpasswd /etc/origin/openshift-htpasswd <user_name>
The user must have the system:registry role. To add this role:
# oadm policy add-role-to-user system:registry <user_name>
Have the admin role for the project associated with the Docker operation. For example, if accessing images in the global openshift project:
$ oadm policy add-role-to-user admin <user_name> -n openshift
For writing or pushing images, for example when using the
docker push
command, the user must have the system:image-builder role. To add this role:$ oadm policy add-role-to-user system:image-builder <user_name>
For more information on user permissions, see Managing Role Bindings.
3.3.3.2. Logging in to the Registry
Ensure your user satisfies the prerequisites for accessing the registry directly.
To log in to the registry directly:
Ensure you are logged in to OpenShift Container Platform as a regular user:
$ oc login
Get your access token:
$ oc whoami -t
Log in to the Docker registry:
$ docker login -u <username> -e <any_email_address> \ -p <token_value> <registry_ip>:<port>
3.3.3.3. Pushing and Pulling Images
After logging in to the registry, you can perform docker pull
and docker push
operations against your registry.
You can pull arbitrary images, but if you have the system:registry role added, you can only push images to the registry in your project.
In the following examples, we use:
Component | Value |
<registry_ip> |
|
<port> |
|
<project> |
|
<image> |
|
<tag> |
omitted (defaults to |
Pull an arbitrary image:
$ docker pull docker.io/busybox
Tag the new image with the form
<registry_ip>:<port>/<project>/<image>
. The project name must appear in this pull specification for OpenShift Container Platform to correctly place and later access the image in the registry.$ docker tag docker.io/busybox 172.30.124.220:5000/openshift/busybox
NoteYour regular user must have the system:image-builder role for the specified project, which allows the user to write or push an image. Otherwise, the
docker push
in the next step will fail. To test, you can create a new project to push the busybox image.Push the newly-tagged image to your registry:
$ docker push 172.30.124.220:5000/openshift/busybox ... cf2616975b4a: Image successfully pushed Digest: sha256:3662dd821983bc4326bee12caec61367e7fb6f6a3ee547cbaff98f77403cab55
3.4. Securing and Exposing the Registry
3.4.1. Securing the Registry
Optionally, you can secure the registry so that it serves traffic via TLS:
- Deploy the registry.
Fetch the service IP and port of the registry:
$ oc get svc/docker-registry NAME LABELS SELECTOR IP(S) PORT(S) docker-registry docker-registry=default docker-registry=default 172.30.124.220 5000/TCP
You can use an existing server certificate, or create a key and server certificate valid for specified IPs and host names, signed by a specified CA. To create a server certificate for the registry service IP and the docker-registry.default.svc.cluster.local host name:
$ oadm ca create-server-cert \ --signer-cert=/etc/origin/master/ca.crt \ --signer-key=/etc/origin/master/ca.key \ --signer-serial=/etc/origin/master/ca.serial.txt \ --hostnames='docker-registry.default.svc.cluster.local,docker-registry.default.svc,172.30.124.220' \ --cert=/etc/secrets/registry.crt \ --key=/etc/secrets/registry.key
If the router will be exposed externally, add the public route host name in the
--hostnames
flag:--hostnames='mydocker-registry.example.com,docker-registry.default.svc.cluster.local,172.30.124.220 \
See Redeploying Registry and Router Certificates for additional details on updating the default certificate so that the route is externally accessible.
NoteThe
oadm ca create-server-cert
command generates a certificate that is valid for two years. This can be altered with the--expire-days
option, but for security reasons, it is recommended to not make it greater than this value.Create the secret for the registry certificates:
$ oc secrets new registry-secret \ /etc/secrets/registry.crt \ /etc/secrets/registry.key
Add the secret to the registry pod’s service accounts (including the default service account):
$ oc secrets link registry registry-secret $ oc secrets link default registry-secret
NoteLimiting secrets to only the service accounts that reference them is disabled by default. This means that if
serviceAccountConfig.limitSecretReferences
is set tofalse
(the default setting) in the master configuration file, linking secrets to a service is not required.Add the secret volume to the registry deployment configuration:
$ oc volume dc/docker-registry --add --type=secret \ --secret-name=registry-secret -m /etc/secrets
Enable TLS by adding the following environment variables to the registry deployment configuration:
$ oc set env dc/docker-registry \ REGISTRY_HTTP_TLS_CERTIFICATE=/etc/secrets/registry.crt \ REGISTRY_HTTP_TLS_KEY=/etc/secrets/registry.key
See more details on overriding registry options.
Update the scheme used for the registry’s liveness probe from HTTP to HTTPS:
$ oc patch dc/docker-registry -p '{"spec": {"template": {"spec": {"containers":[{ "name":"registry", "livenessProbe": {"httpGet": {"scheme":"HTTPS"}} }]}}}}'
If your registry was initially deployed on OpenShift Container Platform 3.2 or later, update the scheme used for the registry’s readiness probe from HTTP to HTTPS:
$ oc patch dc/docker-registry -p '{"spec": {"template": {"spec": {"containers":[{ "name":"registry", "readinessProbe": {"httpGet": {"scheme":"HTTPS"}} }]}}}}'
Validate the registry is running in TLS mode. Wait until the latest docker-registry deployment completes and verify the Docker logs for the registry container. You should find an entry for
listening on :5000, tls
.$ oc logs dc/docker-registry | grep tls time="2015-05-27T05:05:53Z" level=info msg="listening on :5000, tls" instance.id=deeba528-c478-41f5-b751-dc48e4935fc2
Copy the CA certificate to the Docker certificates directory. This must be done on all nodes in the cluster:
$ dcertsdir=/etc/docker/certs.d $ destdir_addr=$dcertsdir/172.30.124.220:5000 $ destdir_name=$dcertsdir/docker-registry.default.svc.cluster.local:5000 $ sudo mkdir -p $destdir_addr $destdir_name $ sudo cp ca.crt $destdir_addr 1 $ sudo cp ca.crt $destdir_name
- 1
- The ca.crt file is a copy of /etc/origin/master/ca.crt on the master.
When using authentication, some versions of
docker
also require you to configure your cluster to trust the certificate at the OS level.Copy the certificate:
$ cp /etc/origin/master/ca.crt /etc/pki/ca-trust/source/anchors/myregistrydomain.com.crt
Run:
$ update-ca-trust enable
Remove the
--insecure-registry
option only for this particular registry in the /etc/sysconfig/docker file. Then, reload the daemon and restart the docker service to reflect this configuration change:$ sudo systemctl daemon-reload $ sudo systemctl restart docker
Validate the
docker
client connection. Runningdocker push
to the registry ordocker pull
from the registry should succeed. Make sure you have logged into the registry.$ docker tag|push <registry/image> <internal_registry/project/image>
For example:
$ docker pull busybox $ docker tag docker.io/busybox 172.30.124.220:5000/openshift/busybox $ docker push 172.30.124.220:5000/openshift/busybox ... cf2616975b4a: Image successfully pushed Digest: sha256:3662dd821983bc4326bee12caec61367e7fb6f6a3ee547cbaff98f77403cab55
3.4.2. Exposing the Registry
To expose your internal registry externally, it is recommended that you run a secure registry. To expose the registry you must first have deployed a router.
- Deploy the registry.
- Secure the registry.
- Deploy a router.
Create a passthrough route via the
oc create route passthrough
command, specifying the registry as the route’s service. By default, the name of the created route is the same as the service name.For example:
$ oc get svc NAME CLUSTER_IP EXTERNAL_IP PORT(S) SELECTOR AGE docker-registry 172.30.69.167 <none> 5000/TCP docker-registry=default 4h kubernetes 172.30.0.1 <none> 443/TCP,53/UDP,53/TCP <none> 4h router 172.30.172.132 <none> 80/TCP router=router 4h $ oc create route passthrough \ --service=docker-registry \1 --hostname=<host> route "docker-registry" created 2
$ oc get route/docker-registry -o yaml apiVersion: v1 kind: Route metadata: name: docker-registry spec: host: <host> 1 to: kind: Service name: docker-registry 2 tls: termination: passthrough 3
NotePassthrough is currently the only type of route supported for exposing the secure registry.
Next, you must trust the certificates being used for the registry on your host system. The certificates referenced were created when you secured your registry.
$ sudo mkdir -p /etc/docker/certs.d/<host> $ sudo cp <ca certificate file> /etc/docker/certs.d/<host> $ sudo systemctl restart docker
Log in to the registry using the information from securing the registry. However, this time point to the host name used in the route rather than your service IP. You should now be able to tag and push images using the route host.
$ oc get imagestreams -n test NAME DOCKER REPO TAGS UPDATED $ docker pull busybox $ docker tag busybox <host>/test/busybox $ docker push <host>/test/busybox The push refers to a repository [<host>/test/busybox] (len: 1) 8c2e06607696: Image already exists 6ce2e90b0bc7: Image successfully pushed cf2616975b4a: Image successfully pushed Digest: sha256:6c7e676d76921031532d7d9c0394d0da7c2906f4cb4c049904c4031147d8ca31 $ docker pull <host>/test/busybox latest: Pulling from <host>/test/busybox cf2616975b4a: Already exists 6ce2e90b0bc7: Already exists 8c2e06607696: Already exists Digest: sha256:6c7e676d76921031532d7d9c0394d0da7c2906f4cb4c049904c4031147d8ca31 Status: Image is up to date for <host>/test/busybox:latest $ oc get imagestreams -n test NAME DOCKER REPO TAGS UPDATED busybox 172.30.11.215:5000/test/busybox latest 2 seconds ago
NoteYour image streams will have the IP address and port of the registry service, not the route name and port. See
oc get imagestreams
for details.NoteIn the
<host>/test/busybox
example above,test
refers to the project name.
3.4.2.1. Exposing a Secure Registry
Instead of logging in to the registry from within the OpenShift Container Platform cluster, you can gain external access to it by first securing the registry and then exposing the registry. This allows you to log in to the registry from outside the cluster using the route address, and to tag and push images using the route host.
When logging in to the secured and exposed registry, make sure you specify the registry in the login command. For example:
docker login -e user@company.com -u f83j5h6 -p Ju1PeM47R0B92Lk3AZp-bWJSck2F7aGCiZ66aFGZrs2 registry.example.com:80
3.4.2.2. Exposing a Non-Secure Registry
Instead of securing the registry in order to expose the registry, you can simply expose a non-secure registry for non-production OpenShift Container Platform environments. This allows you to have an external route to the registry without using SSL certificates.
Only non-production environments should expose a non-secure registry to external access.
To expose a non-secure registry:
Expose the registry:
# oc expose service docker-registry --hostname=<hostname> -n default
This creates the following JSON file:
apiVersion: v1 kind: Route metadata: creationTimestamp: null labels: docker-registry: default name: docker-registry spec: host: registry.example.com port: targetPort: "5000" to: kind: Service name: docker-registry status: {}
Verify that the route has been created successfully:
# oc get route NAME HOST/PORT PATH SERVICE LABELS INSECURE POLICY TLS TERMINATION docker-registry registry.example.com docker-registry docker-registry=default
Check the health of the registry:
$ curl -v http://registry.example.com/healthz
Expect an HTTP 200/OK message.
After exposing the registry, update your /etc/sysconfig/docker file by adding the port number to the
OPTIONS
entry. For example:OPTIONS='--selinux-enabled --insecure-registry=172.30.0.0/16 --insecure-registry registry.example.com:80'
ImportantThe above options should be added on the client from which you are trying to log in.
Also, ensure that Docker is running on the client.
When logging in to the non-secured and exposed registry, make sure you specify the registry in the login command. For example:
docker login -e user@company.com -u f83j5h6 -p Ju1PeM47R0B92Lk3AZp-bWJSck2F7aGCiZ66aFGZrs2 registry.example.com:80
3.5. Extended Registry Configuration
3.5.1. Maintaining the Registry IP Address
OpenShift Container Platform refers to the integrated registry by its service IP address, so if you decide to delete and recreate the docker-registry service, you can ensure a completely transparent transition by arranging to re-use the old IP address in the new service. If a new IP address cannot be avoided, you can minimize cluster disruption by rebooting only the masters.
- Re-using the Address
- To re-use the IP address, you must save the IP address of the old docker-registry service prior to deleting it, and arrange to replace the newly assigned IP address with the saved one in the new docker-registry service.
Make a note of the
clusterIP
for the service:$ oc get svc/docker-registry -o yaml | grep clusterIP:
Delete the service:
$ oc delete svc/docker-registry dc/docker-registry
Create the registry definition in registry.yaml, replacing
<options>
with, for example, those used in step 3 of the instructions in the Non-Production Use section:$ oadm registry <options> -o yaml > registry.yaml
-
Edit registry.yaml, find the
Service
there, and change itsclusterIP
to the address noted in step 1. Create the registry using the modified registry.yaml:
$ oc create -f registry.yaml
- Rebooting the Masters
If you are unable to re-use the IP address, any operation that uses a pull specification that includes the old IP address will fail. To minimize cluster disruption, you must reboot the masters:
# systemctl restart atomic-openshift-master
This ensures that the old registry URL, which includes the old IP address, is cleared from the cache.
NoteWe recommend against rebooting the entire cluster because that incurs unnecessary downtime for pods and does not actually clear the cache.
3.5.2. Whitelisting Docker Registries
You can specify a whitelist of docker registries, allowing you to curate a set of images and templates that are available for download by OpenShift Container Platform users. This curated set can be placed in one or more docker registries, and then added to the whitelist. When using a whitelist, only the specified registries are accessible within OpenShift Container Platform, and all other registries are denied access by default.
To configure a whitelist:
Edit the /etc/sysconfig/docker file to block all registries:
BLOCK_REGISTRY='--block-registry=all'
You may need to uncomment the
BLOCK_REGISTRY
line.In the same file, add registries to which you want to allow access:
ADD_REGISTRY='--add-registry=<registry1> --add-registry=<registry2>'
Example 3.1. Allowing Access to Registries
ADD_REGISTRY='--add-registry=registry.access.redhat.com'
This example would restrict access to images available on the Red Hat Customer Portal.
Once the whitelist is configured, if a user tries to pull from a docker registry that is not on the whitelist, they will receive an error message stating that this registry is not allowed.
3.5.3. Overriding the Registry Configuration
You can override the integrated registry’s default configuration, found by default at /config.yml in a running registry’s container, with your own custom configuration.
Upstream configuration options in this file may also be overridden using environment variables. The middleware section is an exception as there are just a few options that can be overridden using environment variables. Learn how to override specific configuration options.
To enable management of the registry configuration file directly and deploy an updated configuration, mount the configuration file as a secret volume:
- Deploy the registry.
Edit the registry configuration file locally as needed. The initial YAML file deployed on the registry is provided below. Review supported options.
Example 3.2. Registry Configuration File
version: 0.1 log: level: debug http: addr: :5000 storage: cache: blobdescriptor: inmemory filesystem: rootdirectory: /registry delete: enabled: true auth: openshift: realm: openshift middleware: registry: - name: openshift repository: - name: openshift options: acceptschema2: false pullthrough: true enforcequota: false projectcachettl: 1m blobrepositorycachettl: 10m storage: - name: openshift
Create a new secret called registry-config from your custom registry configuration file you edited locally:
$ oc secrets new registry-config config.yml=</path/to/custom/registry/config.yml>
Add the registry-config secret as a volume to the registry’s deployment configuration to mount the custom configuration file at /etc/docker/registry/:
$ oc volume dc/docker-registry --add --type=secret \ --secret-name=registry-config -m /etc/docker/registry/
Update the registry to reference the configuration path from the previous step by adding the following environment variable to the registry’s deployment configuration:
$ oc set env dc/docker-registry \ REGISTRY_CONFIGURATION_PATH=/etc/docker/registry/config.yml
This may be performed as an iterative process to achieve the desired configuration. For example, during troubleshooting, the configuration may be temporarily updated to put it in debug mode.
To update an existing configuration:
This procedure will overwrite the currently deployed registry configuration.
- Edit the local registry configuration file, config.yml.
Delete the registry-config secret:
$ oc delete secret registry-config
Recreate the secret to reference the updated configuration file:
$ oc secrets new registry-config config.yml=</path/to/custom/registry/config.yml>
Redeploy the registry to read the updated configuration:
$ oc deploy docker-registry --latest
Maintain configuration files in a source control repository.
3.5.4. Registry Configuration Reference
There are many configuration options available in the upstream Docker Distribution library. Not all configuration options are supported or enabled. Use this section as a reference when overriding the registry configuration.
Upstream configuration options in this file may also be overridden using environment variables. However, the middleware section may not be overridden using environment variables. Learn how to override specific configuration options.
3.5.4.1. Log
Upstream options are supported.
Example:
log: level: debug formatter: text fields: service: registry environment: staging
3.5.4.2. Hooks
Mail hooks are not supported.
3.5.4.3. Storage
This section lists the supported registry storage drivers.
The following list includes storage drivers that need to be configured in the registry’s configuration file:
- Filesystem. Filesystem is the default and does not need to be configured.
- S3. Learn more about CloudFront configuration.
- OpenStack Swift
- Google Cloud Storage (GCS)
- Microsoft Azure
- Aliyun OSS
General registry storage configuration options are supported.
The following storage options need to be configured through the filesystem driver:
For more information on supported persistent storage drivers, see Configuring Persistent Storage and Persistent Storage Examples.
Example 3.3. General Storage Configuration Options
storage:
delete:
enabled: true 1
redirect:
disable: false
cache:
blobdescriptor: inmemory
maintenance:
uploadpurging:
enabled: true
age: 168h
interval: 24h
dryrun: false
readonly:
enabled: false
- 1
- This entry is mandatory for image pruning to work properly.
3.5.4.4. Auth
Auth options should not be altered. The openshift extension is the only supported option.
auth: openshift: realm: openshift
3.5.4.5. Middleware
The repository middleware extension allows to configure OpenShift Container Platform middleware responsible for interaction with OpenShift Container Platform and image proxying.
middleware: registry: - name: openshift 1 repository: - name: openshift 2 options: acceptschema2: false 3 pullthrough: true 4 enforcequota: false 5 projectcachettl: 1m 6 blobrepositorycachettl: 10m 7 storage: - name: openshift 8
- 1 2 8
- These entries are mandatory. Their presence ensures required components get loaded. These values shouldn’t be changed.
- 3
- Allow to store manifest v2 schema 2 during a push to the registry. See below for more details.
- 4
- Let the registry act as a proxy for remote blobs. See below for more details.
- 5
- Prevent blob uploads exceeding size limit defined in targeted project.
- 6
- An expiration timeout for limits cached in the registry. The lower the value, the less time will it take for the limit changes to propagate to the registry. However, the registry will query limits from the server more frequently and, as a consequence, pushes will be slower.
- 7
- An expiration timeout for remembered associations between blob and repository. The higher the value, the higher probability of fast lookup and more efficient registry operation. On the other hand, memory usage will raise as well as a risk of serving image layer to user, who is no longer authorized to access it.
3.5.4.5.1. CloudFront Middleware
The CloudFront middleware extension can be added to support AWS, CloudFront CDN storage provider. CloudFront middleware speeds up distribution of image content internationally. The blobs are distributed to several edge locations around the world. The client is always directed to the edge with the lowest latency.
The CloudFront middleware extension can be only used with S3 storage. It is utilized only during blob serving. Therefore, only blob downloads can be speeded up, not uploads.
The following is an example of minimal configuration of S3 storage driver with a CloudFront middleware:
version: 0.1 log: level: debug http: addr: :5000 storage: cache: blobdescriptor: inmemory delete: enabled: true s3: 1 accesskey: BJKMSZBRESWJQXRWMAEQ secretkey: 5ah5I91SNXbeoUXXDasFtadRqOdy62JzlnOW1goS region: us-east-1 bucket: docker.myregistry.com auth: openshift: realm: openshift middleware: registry: - name: openshift repository: - name: openshift storage: - name: cloudfront 2 options: baseurl: https://jrpbyn0k5k88bi.cloudfront.net/ 3 privatekey: /etc/docker/cloudfront-ABCEDFGHIJKLMNOPQRST.pem 4 keypairid: ABCEDFGHIJKLMNOPQRST 5 - name: openshift
- 1
- The S3 storage must be configured the same way regardless of CloudFront middleware.
- 2
- The CloudFront storage middleware needs to be listed before OpenShift middleware.
- 3
- The CloudFront base URL. In the AWS management console, this is listed as Domain Name of CloudFront distribution.
- 4
- The location of your AWS private key on the filesystem. This must be not confused with Amazon EC2 key pair. Please refer to AWS documentation on creating CloudFront key pairs for your trusted signers. The file needs to be mounted as a secret secret into the registry pod.
- 5
- The ID of your Cloudfront key pair.
3.5.4.5.2. Overriding Middleware Configuration Options
The middleware section cannot be overridden using environment variables. There are a few exceptions, however. For example:
middleware: repository: - name: openshift options: acceptschema2: false 1 enforcequota: false 2 projectcachettl: 1m 3 blobrepositorycachettl: 10m 4
- 1
- A configuration option that can be overridden by the boolean environment variable
REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_ACCEPTSCHEMA2
, which allows for the ability to accept manifest v2 schema 2 on manifest put requests. - 2
- A configuration option that can be overridden by the boolean environment variable
REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_ENFORCEQUOTA
, which allows the ability to turn quota enforcement on or off. By default, quota enforcement is off. It overrides OpenShift Container Platform middleware configuration option. Recognized values are true and false. - 3
- A configuration option that can be overridden by the environment variable
REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_PROJECTCACHETTL
, specifying an eviction timeout for project quota objects. It takes a valid time duration string (for example, 2m). If empty, you get the default timeout. If zero (0m), caching is disabled. - 4
- A configuration option that can be overriden by the environment variable
REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_BLOBREPOSITORYCACHETTL
, specifying an eviction timeout for associations between blob and containing repository. The format of the value is the same as inprojectcachettl
case.
3.5.4.5.3. Image Pullthrough
If enabled, the registry will attempt to fetch requested blob from a remote registry unless the blob exists locally. The remote candidates are calculated from DockerImage entries stored in status of the image stream, a client pulls from. All the unique remote registry references in such entries will be tried in turn until the blob is found. The blob, served this way, will not be stored in the registry.
You must ensure that your registry has appropriate certificates to trust any external registries you do a pullthrough against. The certificates need to be placed in the /etc/pki/tls/certs directory on the pod. You can mount the certificates using a configuration map or secret. Note that the entire /etc/pki/tls/certs directory must be replaced. You must include the new certificates and replace the system certificates in your secret or configuration map that you mount.
This feature is on by default. However, it can be disabled using a configuration option.
3.5.4.5.4. Manifest V2 Schema 2 Support
Each image has a manifest describing its blobs, instructions for running it and additional metadata. The manifest is versioned which have different structure and fields as it evolves over time. The same image can be represented by multiple manifest versions. Each version will have different digest though.
The registry currently supports manifest v2 schema 1 (schema 1) and manifest v2 schema 2 (schema 2). The former is being obsoleted but will be supported for an extended amount of time.
You should be wary of compatibility issues with various Docker clients:
- Docker clients of version 1.9 or older support only schema 1. Any manifest this client pulls or pushes will be of this legacy schema.
- Docker clients of version 1.10 support both schema 1 and schema 2. And by default, it will push the latter to the registry if it supports newer schema.
The registry, storing an image with schema 1 will always return it unchanged to the client. Schema 2 will be transferred unchanged only to newer Docker client. For the older one, it will be converted on-the-fly to schema 1.
This has significant consequences. For example an image pushed to the registry by a newer Docker client cannot be pulled by the older Docker by its digest. That’s because the stored image’s manifest is of schema 2 and its digest can be used to pull only this version of manifest.
For this reason, the registry is configured by default not to store schema 2. This ensures that any docker client will be able to pull from the registry any image pushed there regardless of client’s version.
Once you’re confident that all the registry clients support schema 2, you’ll be safe to enable its support in the registry. See the middleware configuration reference above for particular option.
3.5.4.6. Reporting
Reporting is unsupported.
3.5.4.7. HTTP
Upstream options are supported. Learn how to alter these settings via environment variables. Only the tls section should be altered. For example:
http: addr: :5000 tls: certificate: /etc/secrets/registry.crt key: /etc/secrets/registry.key
3.5.4.8. Notifications
Upstream options are supported. The REST API Reference provides more comprehensive integration options.
Example:
notifications: endpoints: - name: registry disabled: false url: https://url:port/path headers: Accept: - text/plain timeout: 500 threshold: 5 backoff: 1000
3.5.4.9. Redis
Redis is not supported.
3.5.4.10. Health
Upstream options are supported. The registry deployment configuration provides an integrated health check at /healthz.
3.5.4.11. Proxy
Proxy configuration should not be enabled. This functionality is provided by the OpenShift Container Platform repository middleware extension, pullthrough: true.
3.6. Known Issues
3.6.1. Overview
The following are the known issues when deploying or using the integrated registry.
3.6.2. Image Push Errors with Scaled Registry Using Shared NFS Volume
When using a scaled registry with a shared NFS volume, you may see one of the following errors during the push of an image:
-
digest invalid: provided digest did not match uploaded content
-
blob upload unknown
-
blob upload invalid
These errors are returned by an internal registry service when Docker attempts to push the image. Its cause originates in the synchronization of file attributes across nodes. Factors such as NFS client side caching, network latency, and layer size can all contribute to potential errors that might occur when pushing an image using the default round-robin load balancing configuration.
You can perform the following steps to minimize the probability of such a failure:
Ensure that the
sessionAffinity
of your docker-registry service is set toClientIP
:$ oc get svc/docker-registry --template='{{.spec.sessionAffinity}}'
This should return
ClientIP
, which is the default in recent OpenShift Container Platform versions. If not, change it:$ oc get -o yaml svc/docker-registry | \ sed 's/\(sessionAffinity:\s*\).*/\1ClientIP/' | \ oc replace -f -
-
Ensure that the NFS export line of your registry volume on your NFS server has the
no_wdelay
options listed. Theno_wdelay
option prevents the server from delaying writes, which greatly improves read-after-write consistency, a requirement of the registry.
The guidelines for NFS are recommended to help you get started. You may switch off from NFS when moving to production.
3.6.3. Pull of Internally Managed Image Fails with "not found" Error
This error occurs when the pulled image is pushed to an image stream different from the one it is being pulled from. This is caused by re-tagging a built image into an arbitrary image stream:
$ oc tag srcimagestream:latest anyproject/pullimagestream:latest
And subsequently pulling from it, using an image reference such as:
internal.registry.url:5000/anyproject/pullimagestream:latest
During a manual Docker pull, this will produce a similar error:
Error: image anyproject/pullimagestream:latest not found
To prevent this, avoid the tagging of internally managed images completely, or re-push the built image to the desired namespace manually.
3.6.4. Image Push Fails with "500 Internal Server Error" on S3 Storage
There are problems reported happening when the registry runs on S3 storage back-end. Pushing to a Docker registry occasionally fails with the following error:
Received unexpected HTTP status: 500 Internal Server Error
To debug this, you need to view the registry logs. In there, look for similar error messages occurring at the time of the failed push:
time="2016-03-30T15:01:21.22287816-04:00" level=error msg="unknown error completing upload: driver.Error{DriverName:\"s3\", Enclosed:(*url.Error)(0xc20901cea0)}" http.request.method=PUT ... time="2016-03-30T15:01:21.493067808-04:00" level=error msg="response completed with error" err.code=UNKNOWN err.detail="s3: Put https://s3.amazonaws.com/oso-tsi-docker/registry/docker/registry/v2/blobs/sha256/ab/abe5af443833d60cf672e2ac57589410dddec060ed725d3e676f1865af63d2e2/data: EOF" err.message="unknown error" http.request.method=PUT ... time="2016-04-02T07:01:46.056520049-04:00" level=error msg="error putting into main store: s3: The request signature we calculated does not match the signature you provided. Check your key and signing method." http.request.method=PUT atest
If you see such errors, contact your Amazon S3 support. There may be a problem in your region or with your particular bucket.
3.6.5. Image Pruning Fails
If you encounter the following error when pruning images:
BLOB sha256:49638d540b2b62f3b01c388e9d8134c55493b1fa659ed84e97cb59b87a6b8e6c error deleting blob
And your registry log contains the following information:
error deleting blob \"sha256:49638d540b2b62f3b01c388e9d8134c55493b1fa659ed84e97cb59b87a6b8e6c\": operation unsupported
It means that your custom configuration file lacks mandatory entries in the storage section, namely storage:delete:enabled
set to true. Add them, re-deploy the registry, and repeat your image pruning operation.
Chapter 4. Setting up a Router
4.1. Router Overview
4.1.1. About Routers
The OpenShift Container Platform router is the ingress point for all external traffic destined for services in your OpenShift Container Platform installation. OpenShift Container Platform provides and supports the following two router plug-ins:
- The HAProxy template router is the default plug-in. It uses the openshift3/ose-haproxy-router image to run an HAProxy instance alongside the template router plug-in inside a container on OpenShift Container Platform. It currently supports HTTP(S) traffic and TLS-enabled traffic via SNI. The router’s container listens on the host network interface, unlike most containers that listen only on private IPs. The router proxies external requests for route names to the IPs of actual pods identified by the service associated with the route.
- The F5 router integrates with an existing F5 BIG-IP® system in your environment to synchronize routes. F5 BIG-IP® version 11.4 or newer is required in order to have the F5 iControl REST API.
The F5 router plug-in is available starting in OpenShift Container Platform 3.0.2.
4.1.2. Router Service Account
Before deploying an OpenShift Container Platform cluster, you must have a service account for the router. Starting in OpenShift Container Platform 3.1, a router service account is automatically created during a quick or advanced installation (previously, this required manual creation). This service account has permissions to a security context constraint (SCC) that allows it to specify host ports.
Use of labels (e.g., to define router shards) requires cluster-reader
permission.
$ oadm policy add-cluster-role-to-user \ cluster-reader \ system:serviceaccount:default:router
4.2. Using the Default HAProxy Router
4.2.1. Overview
The oadm router
command is provided with the administrator CLI to simplify the tasks of setting up routers in a new installation. If you followed the quick installation, then a default router was automatically created for you. The oadm router
command creates the service and deployment configuration objects. Just about every form of communication between OpenShift Container Platform components is secured by TLS and uses various certificates and authentication methods. Use the --service-account
option to specify the service account the router will use to contact the master.
Routers directly attach to port 80 and 443 on all interfaces on a host. Restrict routers to hosts where port 80/443 is available and not being consumed by another service, and set this using node selectors and the scheduler configuration. As an example, you can achieve this by dedicating infrastructure nodes to run services such as routers.
It is recommended to use separate distinct openshift-router service account with your router. This can be provided using the --service-account
flag to the oadm router
command.
$ oadm router --dry-run --service-account=router 1
Router pods created using oadm router
have default resource requests that a node must satisfy for the router pod to be deployed. In an effort to increase the reliability of infrastructure components, the default resource requests are used to increase the QoS tier of the router pods above pods without resource requests. The default values represent the observed minimum resources required for a basic router to be deployed and can be edited in the routers deployment configuration and you may want to increase them based on the load of the router.
4.2.2. Creating a Router
The quick installation process automatically creates a default router. If the router does not exist, run the following to create a router:
$ oadm router <router_name> --replicas=<number> --service-account=router
You can also use router shards to ensure that the router is filtered to specific namespaces or routes, or set any environment variables after router creation.
4.2.3. Other Basic Router Commands
- Checking the Default Router
- The default router service account, named router, is automatically created during quick and advanced installations. To verify that this account already exists:
$ oadm router --dry-run --service-account=router
- Viewing the Default Router
- To see what the default router would look like if created:
$ oadm router -o yaml --service-account=router
- Deploying the Router to a Labeled Node
- To deploy the router to any node(s) that match a specified node label:
$ oadm router <router_name> --replicas=<number> --selector=<label> \ --service-account=router
For example, if you want to create a router named router
and have it placed on a node labeled with region=infra
:
$ oadm router router --replicas=1 --selector='region=infra' \ --service-account=router
During advanced installation, the openshift_hosted_router_selector
and openshift_registry_selector
Ansible settings are set to region=infra by default. The default router and registry will only be automatically deployed if a node exists that matches the region=infra label.
Multiple instances are created on different hosts according to the scheduler policy.
- Using a Different Router Image
- To use a different router image and view the router configuration that would be used:
$ oadm router <router_name> -o <format> --images=<image> \ --service-account=router
For example:
$ oadm router region-west -o yaml --images=myrepo/somerouter:mytag \ --service-account=router
4.2.4. Filtering Routes to Specific Routers
Using the ROUTE_LABELS
environment variable, you can filter routes so that they are used only by specific routers.
For example, if you have multiple routers, and 100 routes, you can attach labels to the routes so that a portion of them are handled by one router, whereas the rest are handled by another.
After creating a router, use the
ROUTE_LABELS
environment variable to tag the router:$ oc env dc/<router=name> ROUTE_LABELS="key=value"
Add the label to the desired routes:
oc label route <route=name> key=value
To verify that the label has been attached to the route, check the route configuration:
$ oc describe dc/<route_name>
4.2.5. Highly-Available Routers
You can set up a highly-available router on your OpenShift Container Platform cluster using IP failover.
4.2.6. Customizing the Router Service Ports
You can customize the service ports that a template router binds to by setting the environment variables ROUTER_SERVICE_HTTP_PORT
and ROUTER_SERVICE_HTTPS_PORT
. This can be done by creating a template router, then editing its deployment configuration.
The following example creates a router deployment with 0
replicas and customizes the router service HTTP and HTTPS ports, then scales it appropriately (to 1
replica).
$ oadm router --replicas=0 --ports='10080:10080,10443:10443' 1
$ oc set env dc/router ROUTER_SERVICE_HTTP_PORT=10080 \
ROUTER_SERVICE_HTTPS_PORT=10443
$ oc scale dc/router --replicas=1
- 1
- Ensures exposed ports are appropriately set for routers that use the container networking mode
--host-network=false
.
If you do customize the template router service ports, you will also need to ensure that the nodes where the router pods run have those custom ports opened in the firewall (either via Ansible or iptables
, or any other custom method that you use via firewall-cmd
).
The following is an example using iptables
to open the custom router service ports.
$ iptables -A INPUT -p tcp --dport 10080 -j ACCEPT $ iptables -A INPUT -p tcp --dport 10443 -j ACCEPT
4.2.7. Working With Multiple Routers
An administrator can create multiple routers with the same definition to serve the same set of routes. By having different groups of routers with different namespace or route selectors, they can vary the routes that the router serves.
Multiple routers can be grouped to distribute routing load in the cluster and separate tenants to different routers or shards. Each router or shard in the group handles routes based on the selectors in the router. An administrator can create shards over the whole cluster using ROUTE_LABELS
. A user can create shards over a namespace (project) by using NAMESPACE_LABELS
.
4.2.8. Adding a Node Selector to a Deployment Configuration
Making specific routers deploy on specific nodes requires two steps:
Add a label to the desired node:
$ oc label node 10.254.254.28 "router=first"
Add a node selector to the router deployment configuration:
$ oc edit dc <deploymentConfigName>
Add the
template.spec.nodeSelector
field with a key and value corresponding to the label:... template: metadata: creationTimestamp: null labels: router: router1 spec: nodeSelector: 1 router: "first" ...
- 1
- The key and value are
router
andfirst
, respectively, corresponding to therouter=first
label.
4.2.9. Using Router Shards
The access controls are based on the service account that the router is run with.
Using NAMESPACE_LABELS
and/or ROUTE_LABELS
, a router can filter out the namespaces and/or routes that it should service. This enables you to partition routes amongst multiple router deployments effectively distributing the set of routes.
Figure 4.1. Router Sharding Based on Namespace Labels
Example: A router deployment finops-router
is run with route selector NAMESPACE_LABELS="name in (finance, ops)"
and a router deployment dev-router
is run with route selector NAMESPACE_LABELS="name=dev"
.
If all routes are in the three namespaces finance
, ops
or dev
, then this could effectively distribute your routes across two router deployments.
In the above scenario, sharding becomes a special case of partitioning with no overlapping sets. Routes are divided amongst multiple router shards.
The criteria for route selection governs how the routes are distributed. It is possible to have routes that overlap across multiple router deployments.
Example: In addition to the finops-router
and dev-router
in the example above, you also have devops-router
, which is run with a route selector NAMESPACE_LABELS="name in (dev, ops)"
.
The routes in namespaces dev
or ops
now are serviced by two different router deployments. This becomes a case in which you have partitioned the routes with an overlapping set.
In addition, this enables you to create more complex routing rules, allowing the diversion of high priority traffic to the dedicated finops-router
, but sending the lower priority ones to the devops-router
.
NAMESPACE_LABELS
allows filtering of the projects to service and selecting all the routes from those projects, but you may want to partition routes based on other criteria in the routes themselves. The ROUTE_LABELS
selector allows you to slice-and-dice the routes themselves.
Example: A router deployment prod-router
is run with route selector ROUTE_LABELS="mydeployment=prod"
and a router deployment devtest-router
is run with route selector ROUTE_LABELS="mydeployment in (dev, test)"
.
The example assumes you have all the routes you want to be serviced tagged with a label "mydeployment=<tag>"
.
Figure 4.2. Router Sharding Based on Namespace Names
4.2.9.1. Creating Router Shards
Router sharding lets you select how routes are distributed among a set of routers.
Router sharding is based on labels; you set labels on the routes in the pool, and express the desired subset of those routes for the router to serve with a selection expression via the oc set env
command.
First, ensure that service account associated with the router has the cluster reader
permission.
The rest of this section describes an extended example. Suppose there are 26 routes, named a
— z
, in the pool, with various labels:
Possible labels on routes in the pool
sla=high geo=east hw=modest dept=finance sla=medium geo=west hw=strong dept=dev sla=low dept=ops
These labels express the concepts: service level agreement, geographical location, hardware requirements, and department. The routes in the pool can have at most one label from each column. Some routes may have other labels, entirely, or none at all.
Name(s) | SLA | Geo | HW | Dept | Other Labels |
---|---|---|---|---|---|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
| ||
|
|
|
| ||
|
|
|
| ||
|
|
|
Here is a convenience script mkshard that ilustrates how oadm router
, oc set env
, and oc scale
work together to make a router shard.
#!/bin/bash # Usage: mkshard ID SELECTION-EXPRESSION id=$1 sel="$2" router=router-shard-$id 1 oadm router $router --replicas=0 2 dc=dc/router-shard-$id 3 oc set env $dc ROUTE_LABELS="$sel" 4 oc scale $dc --replicas=3 5
Running mkshard several times creates several routers:
Router | Selection Expression | Routes |
---|---|---|
|
|
|
|
|
|
|
|
|
4.2.9.2. Modifying Router Shards
Because a router shard is a construct based on labels, you can modify either the labels (via oc label
) or the selection expression.
This section extends the example started in the Creating Router Shards section, demonstrating how to change the selection expression.
Here is a convenience script modshard that modifies an existing router to use a new selection expression:
#!/bin/bash # Usage: modshard ID SELECTION-EXPRESSION... id=$1 shift router=router-shard-$id 1 dc=dc/$router 2 oc scale $dc --replicas=0 3 oc set env $dc "$@" 4 oc scale $dc --replicas=3 5
- 1
- The modified router has name
router-shard-<id>
. - 2
- The deployment configuration where the modifications occur.
- 3
- Scale it down.
- 4
- Set the new selection expression using
oc set env
. Unlikemkshard
from the Creating Router Shards section, the selection expression specified as the non-ID
arguments tomodshard
must include the environment variable name as well as its value. - 5
- Scale it back up.
In modshard
, the oc scale
commands are not necessary if the deployment strategy for router-shard-<id>
is Rolling
.
For example, to expand the department for router-shard-3
to include ops
as well as dev
:
$ modshard 3 ROUTE_LABELS='dept in (dev, ops)'
The result is that router-shard-3
now selects routes g
— s
(the combined sets of g
— k
and l
— s
).
This example takes into account that there are only three departments in this example scenario, and specifies a department to leave out of the shard, thus achieving the same result as the preceding example:
$ modshard 3 ROUTE_LABELS='dept != finanace'
This example specifies shows three comma-separated qualities, and results in only route b
being selected:
$ modshard 3 ROUTE_LABELS='hw=strong,type=dynamic,geo=west'
Similarly to ROUTE_LABELS
, which involve a route’s labels, you can select routes based on the labels of the route’s namespace labels, with the NAMESPACE_LABELS
environment variable. This example modifies router-shard-3
to serve routes whose namespace has the label frequency=weekly
:
$ modshard 3 NAMESPACE_LABELS='frequency=weekly'
The last example combines ROUTE_LABELS
and NAMESPACE_LABELS
to select routes with label sla=low
and whose namespace has the label frequency=weekly
:
$ modshard 3 \ NAMESPACE_LABELS='frequency=weekly' \ ROUTE_LABELS='sla=low'
4.2.9.3. Using Namespace Router Shards
The routes for a project can be handled by a selected router by using NAMESPACE_LABELS
. The router is given a selector for a NAMESPACE_LABELS
label and the project that wants to use the router applies the NAMESPACE_LABELS
label to its namespace.
First, ensure that service account associated with the router has the cluster reader
permission. This permits the router to read the labels that are applied to the namespaces.
Now create and label the router:
$ oadm router ... --service-account=router $ oc set env dc/router NAMESPACE_LABELS="router=r1"
Because the router has a selector for a namespace, the router will handle routes for that namespace. So, for example:
$ oc label namespace default "router=r1"
Now create routes in the default namespace, and the route is available in the default router:
$ oc create -f route1.yaml
Now create a new project (namespace) and create a route, route2.
$ oc new-project p1 $ oc create -f route2.yaml
And notice the route is not available in your router. Now label namespace p1 with "router=r1"
$ oc label namespace p1 "router=r1"
Which makes the route available to the router.
Note that removing the label from the namespace won’t have immediate effect (as we don’t see the updates in the router), so if you redeploy/start a new router pod, you should see the unlabelled effects.
$ oc scale dc/router --replicas=0 && oc scale dc/router --replicas=1
4.2.10. Customizing the Default Routing Subdomain
You can customize the suffix used as the default routing subdomain for your environment by modifying the master configuration file (the /etc/origin/master/master-config.yaml file by default). Routes that do not specify a host name would have one generated using this default routing subdomain.
The following example shows how you can set the configured suffix to v3.openshift.test:
routingConfig: subdomain: v3.openshift.test
This change requires a restart of the master if it is running.
With the OpenShift Container Platform master(s) running the above configuration, the generated host name for the example of a route named no-route-hostname without a host name added to a namespace mynamespace would be:
no-route-hostname-mynamespace.v3.openshift.test
4.2.11. Forcing Route Host Names to a Custom Routing Subdomain
If an administrator wants to restrict all routes to a specific routing subdomain, they can pass the --force-subdomain
option to the oadm router
command. This forces the router to override any host names specified in a route and generate one based on the template provided to the --force-subdomain
option.
The following example runs a router, which overrides the route host names using a custom subdomain template ${name}-${namespace}.apps.example.com
.
$ oadm router --force-subdomain='${name}-${namespace}.apps.example.com'
4.2.12. Using Wildcard Certificates
A TLS-enabled route that does not include a certificate uses the router’s default certificate instead. In most cases, this certificate should be provided by a trusted certificate authority, but for convenience you can use the OpenShift Container Platform CA to create the certificate. For example:
$ CA=/etc/origin/master $ oadm ca create-server-cert --signer-cert=$CA/ca.crt \ --signer-key=$CA/ca.key --signer-serial=$CA/ca.serial.txt \ --hostnames='*.cloudapps.example.com' \ --cert=cloudapps.crt --key=cloudapps.key
The router expects the certificate and key to be in PEM format in a single file:
$ cat cloudapps.crt cloudapps.key $CA/ca.crt > cloudapps.router.pem
From there you can use the --default-cert
flag:
$ oadm router --default-cert=cloudapps.router.pem --service-account=router
Browsers only consider wildcards valid for subdomains one level deep. So in this example, the certificate would be valid for a.cloudapps.example.com but not for a.b.cloudapps.example.com.
4.2.13. Manually Redeploy Certificates
To manually redeploy the router certificates:
Check to see if a secret containing the default router certificate was added to the router:
$ oc volumes dc/router deploymentconfigs/router secret/router-certs as server-certificate mounted at /etc/pki/tls/private
If the certificate is added, skip the following step and overwrite the secret.
Make sure that you have a default certificate directory set for the following variable
DEFAULT_CERTIFICATE_DIR
:$ oc env dc/router --list DEFAULT_CERTIFICATE_DIR=/etc/pki/tls/private
If not, create the directory using the following command:
$ oc env dc/router DEFAULT_CERTIFICATE_DIR=/etc/pki/tls/private
Export the certificate to PEM format:
$ cat custom-router.key custom-router.crt custom-ca.crt > custom-router.crt
Overwrite or create a router certificate secret:
If the certificate secret was added to the router, overwrite the secret. If not, create a new secret.
To overwrite the secret, run the following command:
$ oc secrets new router-certs tls.crt=custom-router.crt tls.key=custom-router.key -o json --type='kubernetes.io/tls' --confirm | oc replace -f -
To create a new secret, run the following commands:
$ oc secrets new router-certs tls.crt=custom-router.crt tls.key=custom-router.key --type='kubernetes.io/tls' --confirm $ oc volume dc/router --add --mount-path=/etc/pki/tls/private --secret-name='router-certs' --name router-certs
Deploy the router.
$ oc deploy router --latest
4.2.14. Using Secured Routes
Currently, password protected key files are not supported. HAProxy prompts for a password upon starting and does not have a way to automate this process. To remove a passphrase from a keyfile, you can run:
# openssl rsa -in <passwordProtectedKey.key> -out <new.key>
Here is an example of how to use a secure edge terminated route with TLS termination occurring on the router before traffic is proxied to the destination. The secure edge terminated route specifies the TLS certificate and key information. The TLS certificate is served by the router front end.
First, start up a router instance:
# oadm router --replicas=1 --service-account=router
Next, create a private key, csr and certificate for our edge secured route. The instructions on how to do that would be specific to your certificate authority and provider. For a simple self-signed certificate for a domain named www.example.test
, see the example shown below:
# sudo openssl genrsa -out example-test.key 2048 # # sudo openssl req -new -key example-test.key -out example-test.csr \ -subj "/C=US/ST=CA/L=Mountain View/O=OS3/OU=Eng/CN=www.example.test" # # sudo openssl x509 -req -days 366 -in example-test.csr \ -signkey example-test.key -out example-test.crt
Generate a route using the above certificate and key.
$ oc create route edge --service=my-service \ --hostname=www.example.test \ --key=example-test.key --cert=example-test.crt route "my-service" created
Look at its definition.
$ oc get route/my-service -o yaml apiVersion: v1 kind: Route metadata: name: my-service spec: host: www.example.test to: kind: Service name: my-service tls: termination: edge key: | -----BEGIN PRIVATE KEY----- [...] -----END PRIVATE KEY----- certificate: | -----BEGIN CERTIFICATE----- [...] -----END CERTIFICATE-----
Make sure your DNS entry for www.example.test
points to your router instance(s) and the route to your domain should be available. The example below uses curl along with a local resolver to simulate the DNS lookup:
# routerip="4.1.1.1" # replace with IP address of one of your router instances. # curl -k --resolve www.example.test:443:$routerip https://www.example.test/
4.2.15. Using the Container Network Stack
The OpenShift Container Platform router runs inside a container and the default behavior is to use the network stack of the host (i.e., the node where the router container runs). This default behavior benefits performance because network traffic from remote clients does not need to take multiple hops through user space to reach the target service and container.
Additionally, this default behavior enables the router to get the actual source IP address of the remote connection rather than getting the node’s IP address. This is useful for defining ingress rules based on the originating IP, supporting sticky sessions, and monitoring traffic, among other uses.
This host network behavior is controlled by the --host-network
router command line option, and the default behaviour is the equivalent of using --host-network=true
. If you wish to run the router with the container network stack, use the --host-network=false
option when creating the router. For example:
$ oadm router --service-account=router --host-network=false
Internally, this means the router container must publish the 80 and 443 ports in order for the external network to communicate with the router.
Running with the container network stack means that the router sees the source IP address of a connection to be the NATed IP address of the node, rather than the actual remote IP address.
On OpenShift Container Platform clusters using multi-tenant network isolation, routers on a non-default namespace with the --host-network=false
option will load all routes in the cluster, but routes across the namespaces will not be reachable due to network isolation. With the --host-network=true
option, routes bypass the container network and it can access any pod in the cluster. If isolation is needed in this case, then do not add routes across the namespaces.
4.2.16. Exposing Router Metrics
Using the --metrics-image
and --expose-metrics
options, you can configure the OpenShift Container Platform router to run a sidecar container that exposes or publishes router metrics for consumption by external metrics collection and aggregation systems (e.g. Prometheus, statsd).
Depending on your router implementation, the image is appropriately set up and the metrics sidecar container is started when the router is deployed. For example, the HAProxy-based router implementation defaults to using the prom/haproxy-exporter
image to run as a sidecar container, which can then be used as a metrics datasource by the Prometheus server.
The --metrics-image
option overrides the defaults for HAProxy-based router implementations and, in the case of custom implementations, enables the image to use for a custom metrics exporter or publisher.
Grab the HAProxy Prometheus exporter image from the Docker registry:
$ sudo docker pull prom/haproxy-exporter
Create the OpenShift Container Platform router:
$ oadm router --service-account=router --expose-metrics
Or, optionally, use the
--metrics-image
option to override the HAProxy defaults:$ oadm router --service-account=router --expose-metrics \ --metrics-image=prom/haproxy-exporter
Once the haproxy-exporter containers (and your HAProxy router) have started, point Prometheus to the sidecar container on port 9101 on the node where the haproxy-exporter container is running:
$ haproxy_exporter_ip="<enter-ip-address-or-hostname>" $ cat > haproxy-scraper.yml <<CFGEOF --- global: scrape_interval: "60s" scrape_timeout: "10s" # external_labels: # source: openshift-router scrape_configs: - job_name: "haproxy" target_groups: - targets: - "${haproxy_exporter_ip}:9101" CFGEOF $ # And start prometheus as you would normally using the above config file. $ echo " - Example: prometheus -config.file=haproxy-scraper.yml " $ echo " or you can start it as a container on {product-title}!! $ echo " - Once the prometheus server is up, view the {product-title} HAProxy " $ echo " router metrics at: http://<ip>:9090/consoles/haproxy.html "
4.2.17. Preventing Connection Failures During Restarts
If you connect to the router while the proxy is reloading, there is a small chance that your connection will end up in the wrong network queue and be dropped. The issue is being addressed. In the meantime, it is possible to work around the problem by installing iptables
rules to prevent connections during the reload window. However, doing so means that the router needs to run with elevated privilege so that it can manipulate iptables
on the host. It also means that connections that happen during the reload are temporarily ignored and must retransmit their connection start, lengthening the time it takes to connect, but preventing connection failure.
To prevent this, configure the router to use iptables
by changing the service account, and setting an environment variable on the router.
Use a Privileged SCC
When creating the router, allow it to use the privileged SCC. This gives the router user the ability to create containers with root privileges on the nodes:
$ oadm policy add-scc-to-user privileged -z router
Patch the Router Deployment Configuration to Create a Privileged Container
You can now create privileged containers. Next, configure the router deployment configuration to use the privilege so that the router can set the iptables rules it needs. This patch changes the router deployment configuration so that the container that is created runs as privileged (and therefore gets correct capabilities) and run as root:
$ oc patch dc router -p '{"spec":{"template":{"spec":{"containers":[{"name":"router","securityContext":{"privileged":true}}],"securityContext":{"runAsUser": 0}}}}}'
Configure the Router to Use iptables
Set the option on the router deployment configuration:
$ oc set env dc/router -c router DROP_SYN_DURING_RESTART=true
If you used a non-default name for the router, you must change dc/router accordingly.
4.2.18. Protecting Against DDoS Attacks
Add timeout http-request to the default HAProxy router image to protect the deployment against distributed denial-of-service (DDoS) attacks (for example, slowloris):
# and the haproxy stats socket is available at /var/run/haproxy.stats
global
stats socket ./haproxy.stats level admin
defaults
option http-server-close
mode http
timeout http-request 5s
timeout connect 5s 1
timeout server 10s
timeout client 30s
- 1
- timeout http-request is set up to 5 seconds. HAProxy gives a client 5 seconds *to send its whole HTTP request. Otherwise, HAProxy shuts the connection with *an error.
Also, when the environment variable ROUTER_SLOWLORIS_TIMEOUT
is set, it limits the amount of time a client has to send the whole HTTP request. Otherwise, HAProxy will shut down the connection.
Setting the environment variable allows information to be captured as part of the router’s deployment configuration and does not require manual modification of the template, whereas manually adding the HAProxy setting requires you to rebuild the router pod and maintain your router template file.
Using annotations implements basic DDoS protections in the HAProxy template router, including the ability to limit the:
- number of concurrent TCP connections
- rate at which a client can request TCP connections
- rate at which HTTP requests can be made
These are enabled on a per route basis because applications can have extremely different traffic patterns.
Setting | Description |
---|---|
| Enables the settings be configured (when set to true, for example). |
| The number of concurrent TCP connections that can be made by the same IP address on this route. |
| The number of TCP connections that can be opened by a client IP. |
| The number of HTTP requests that a client IP can make in a 3-second period. |
4.3. Deploying a Customized HAProxy Router
4.3.1. Overview
The default HAProxy router is intended to satisfy the needs of most users. However, it does not expose all of the capability of HAProxy. Therefore, users may need to modify the router for their own needs.
You may need to implement new features within the application back-ends, or modify the current operation. The router plug-in provides all the facilities necessary to make this customization.
The router pod uses a template file to create the needed HAProxy configuration file. The template file is a golang template. When processing the template, the router has access to OpenShift Container Platform information, including the router’s deployment configuration, the set of admitted routes, and some helper functions.
When the router pod starts, and every time it reloads, it creates an HAProxy configuration file, and then it starts HAProxy. The HAProxy configuration manual describes all of the features of HAProxy and how to construct a valid configuration file.
A configMap can be used to add the new template to the router pod. With this approach, the router deployment configuration is modified to mount the configMap as a volume in the router pod. The TEMPLATE_FILE
environment variable is set to the full path name of the template file in the router pod.
Alternatively, you can build a custom router image and use it when deploying some or all of your routers. There is no need for all routers to run the same image. To do this, modify the haproxy-template.config file, and rebuild the router image. The new image is pushed to the the cluster’s Docker repository, and the router’s deployment configuration image: field is updated with the new name. When the cluster is updated, the image needs to be rebuilt and pushed.
In either case, the router pod starts with the template file.
4.3.2. Obtaining the Router Configuration Template
The HAProxy template file is fairly large and complex. For some changes, it may be easier to modify the existing template rather than writing a complete replacement. You can obtain a haproxy-config.template file from a running router by running this on master, referencing the router pod:
# oc get po NAME READY STATUS RESTARTS AGE router-2-40fc3 1/1 Running 0 11d # oc rsh router-2-40fc3 cat haproxy-config.template > haproxy-config.template # oc rsh router-2-40fc3 cat haproxy.config > haproxy.config
Alternatively, you can log onto the node that is running the router:
# docker run --rm --interactive=true --tty --entrypoint=cat \ registry.access.redhat.com/openshift3/ose-haproxy-router:$version haproxy-config.template
The image name is from docker images.
Save this content to a file for use as the basis of your customized template. The saved haproxy.config shows what is actually running.
4.3.3. Modifying the Router Configuration Template
4.3.3.1. Background
The template is based on the golang template. It can reference any of the environment variables in the router’s deployment configuration, any configuration information that is described below, and router provided helper functions.
The structure of the template file mirrors the resulting HAProxy configuration file. As the template is processed, anything not surrounded by {{" something "}}
is directly copied to the configuration file. Passages that are surrounded by {{" something "}}
are evaluated. The resulting text, if any, is copied to the configuration file.
4.3.3.2. Go Template Actions
The define action names the file that will contain the processed template.
{{define "/var/lib/haproxy/conf/haproxy.config"}}pipeline{{end}}
Function | Meaning |
---|---|
| Returns the list of valid endpoints. |
| Tries to get the named environment variable from the pod. Returns the second argument if the variable cannot be read or is empty. |
| The first argument is a string that contains the regular expression, the second argument is the variable to test. Returns a Boolean value indicating whether the regular expression provided as the first argument matches the string provided as the second argument. |
| Determines if a given variable is an integer. |
| Compares a given string to a list of allowed strings. |
| Generates a regular expression matching the subdomain for hosts (and paths) with a wildcard policy. |
| Generates a regular expression matching the route hosts (and paths). The first argument is the host name, the second is the path, and the third is a wildcard Boolean. |
| Generates host name to use for serving/matching certificates. First argument is the host name and the second is the wildcard Boolean. |
These functions are provided by the HAProxy template router plug-in.
4.3.3.3. Router Provided Information
This section reviews the OpenShift Container Platform information that the router makes available to the template. The router configuration parameters are the set of data that the HAProxy router plug-in is given. The fields are accessed by (dot) .Fieldname
.
The tables below the Router Configuration Parameters expand on the definitions of the various fields. In particular, .State has the set of admitted routes.
Field | Type | Description |
---|---|---|
| string | The directory that files will be written to, defaults to /var/lib/containers/router |
|
| The routes. |
|
| The service lookup. |
| string | Full path name to the default certificate in pem format. |
|
| Peers. |
| string | User name to expose stats with (if the template supports it). |
| string | Password to expose stats with (if the template supports it). |
| int | Port to expose stats with (if the template supports it). |
| bool | Whether the router should bind the default ports. |
Field | Type | Description |
---|---|---|
| string | The user-specified name of the route. |
| string | The namespace of the route. |
| string |
The host name. For example, |
| string |
Optional path. For example, |
|
| The termination policy for this back-end; drives the mapping files and router configuration. |
|
| Certificates used for securing this back-end. Keyed by the certificate ID. |
|
| Indicates the status of configuration that needs to be persisted. |
| string | Indicates the port the user wants to expose. If empty, a port will be selected for the service. |
|
|
Indicates desired behavior for insecure connections to an edge-terminated route: |
| string | Hash of the route + namespace name used to obscure the cookie ID. |
| bool | Indicates this service unit needing wildcard support. |
|
| Annotations attached to this route. |
|
| Collection of services that support this route, keyed by service name and valued on the weight attached to it with respect to other entries in the map. |
| int |
Count of the |
The ServiceAliasConfig
is a route for a service. Uniquely identified by host + path. The default template iterates over routes using {{range $cfgIdx, $cfg := .State }}
. Within such a {{range}}
block, the template can refer to any field of the current ServiceAliasConfig
using $cfg.Field
.
Field | Type | Description |
---|---|---|
| string |
Name corresponds to a service name + namespace. Uniquely identifies the |
|
| Endpoints that back the service. This translates into a final back-end implementation for routers. |
ServiceUnit
is an encapsulation of a service, the endpoints that back that service, and the routes that point to the service. This is the data that drives the creation of the router configuration files
Field | Type |
---|---|
| string |
| string |
| string |
| string |
| string |
| string |
| bool |
Endpoint
is an internal representation of a Kubernetes endpoint.
Field | Type | Description |
---|---|---|
| string |
Represents a public/private key pair. It is identified by an ID, which will become the file name. A CA certificate will not have a |
| string | Indicates that the necessary files for this configuration have been persisted to disk. Valid values: "saved", "". |
Field | Type | Description |
---|---|---|
ID | string | |
Contents | string | The certificate. |
PrivateKey | string | The private key. |
Field | Type | Description |
---|---|---|
| string | Dictates where the secure communication will stop. |
| string | Indicates the desired behavior for insecure connections to a route. While each router may make its own decisions on which ports to expose, this is normally port 80. |
TLSTerminationType
and InsecureEdgeTerminationPolicyType
dictate where the secure communication will stop.
Constant | Value | Meaning |
---|---|---|
|
| Terminate encryption at the edge router. |
|
| Terminate encryption at the destination, the destination is responsible for decrypting traffic. |
|
| Terminate encryption at the edge router and re-encrypt it with a new certificate supplied by the destination. |
Type | Meaning |
---|---|
| Traffic is sent to the server on the insecure port (default). |
| No traffic is allowed on the insecure port. |
| Clients are redirected to the secure port. |
None (""
) is the same as Disable
.
4.3.3.4. Annotations
Each route can have annotations attached. Each annotation is just a name and a value.
apiVersion: v1 kind: Route metadata: annotations: haproxy.router.openshift.io/timeout: 5500ms [...]
The name can be anything that does not conflict with existing Annotations. The value is any string. The string can have multiple tokens separated by a space. For example, aa bb cc
. The template uses {{index}}
to extract the value of an annotation. For example:
{{$balanceAlgo := index $cfg.Annotations "haproxy.router.openshift.io/balance"}}
This is an example of how this could be used for mutual client authorization.
{{ with $cnList := index $cfg.Annotations "whiteListCertCommonName" }} {{ if ne $cnList "" }} acl test ssl_c_s_dn(CN) -m str {{ $cnList }} http-request deny if !test {{ end }} {{ end }}
Then, you can handle the white-listed CNs with this command.
$ oc annotate route <route-name> --overwrite whiteListCertCommonName="CN1 CN2 CN3"
4.3.3.5. Environment Variables
The template can use any environment variables that exist in the router pod. The environment variables can be set in the deployment configuration. New environment variables can be added.
They are referenced by the env
function:
{{env "ROUTER_MAX_CONNECTIONS" "20000"}}
The first string is the variable, and the second string is the default when the variable is missing or nil
. When ROUTER_MAX_CONNECTIONS
is not set or is nil
, 20000 is used. Environment variables are a map where the key is the environment variable name and the content is the value of the variable.
See Route-specific Environment variables for more information.
4.3.3.6. Example Usage
Here is a simple template based on the HAProxy template file.
Start with a comment:
{{/* Here is a small example of how to work with templates taken from the HAProxy template file. */}}
The template can create any number of output files. Use a define construct to create an output file. The file name is specified as an argument to define, and everything inside the define block up to the matching end is written as the contents of that file.
{{ define "/var/lib/haproxy/conf/haproxy.config" }} global {{ end }}
The above will copy global
to the /var/lib/haproxy/conf/haproxy.config file, and then close the file.
Set up logging based on environment variables.
{{ with (env "ROUTER_SYSLOG_ADDRESS" "") }} log {{.}} {{env "ROUTER_LOG_FACILITY" "local1"}} {{env "ROUTER_LOG_LEVEL" "warning"}} {{ end }}
The env
function extracts the value for the environment variable. If the environment variable is not defined or nil
, the second argument is returned.
The with construct sets the value of "." (dot) within the with block to whatever value is provided as an argument to with. The with
action tests Dot for nil
. If not nil
, the clause is processed up to the end
. In the above, assume ROUTER_SYSLOG_ADDRESS
contains /var/log/msg, ROUTER_LOG_FACILITY
is not defined, and ROUTER_LOG_LEVEL
contains info
. The following will be copied to the output file:
log /var/log/msg local1 info
Each admitted route ends up generating lines in the configuration file. Use range
to go through the admitted routes:
{{ range $cfgIdx, $cfg := .State }} backend be_http_{{$cfgIdx}} {{end}}
.State
is a map of ServiceAliasConfig
, where the key is the route name. range
steps through the map and, for each pass, it sets $cfgIdx
with the key
, and sets `$cfg
to point to the ServiceAliasConfig
that describes the route. If there are two routes named myroute
and hisroute
, the above will copy the following to the output file:
backend be_http_myroute backend be_http_hisroute
Route Annotations, $cfg.Annotations
, is also a map with the annotation name as the key and the content string as the value. The route can have as many annotations as desired and the use is defined by the template author. The user codes the annotation into the route and the template author customized the HAProxy template to handle the annotation.
The common usage is to index the annotation to get the value.
{{$balanceAlgo := index $cfg.Annotations "haproxy.router.openshift.io/balance"}}
The index extracts the value for the given annotation, if any. Therefore, `$balanceAlgo
will contain the string associated with the annotation or nil
. As above, you can test for a non-nil
string and act on it with the with
construct.
{{ with $balanceAlgo }} balance $balanceAlgo {{ end }}
Here when $balanceAlgo
is not nil
, balance $balanceAlgo
is copied to the output file.
In a second example, you want to set a server timeout based on a timeout value set in an annotation.
$value := index $cfg.Annotations "haproxy.router.openshift.io/timeout"
The $value
can now be evaluated to make sure it contains a properly constructed string. The matchPattern
function accepts a regular expression and returns true
if the argument satisfies the expression.
matchPattern "[1-9][0-9]*(us\|ms\|s\|m\|h\|d)?" $value
This would accept 5000ms
but not 7y
. The results can be used in a test.
{{if (matchPattern "[1-9][0-9]*(us\|ms\|s\|m\|h\|d)?" $value) }} timeout server {{$value}} {{ end }}
It can also be used to match tokens:
matchPattern "roundrobin|leastconn|source" $balanceAlgo
Alternatively matchValues
can be used to match tokens:
matchValues $balanceAlgo "roundrobin" "leastconn" "source"
4.3.4. Using a ConfigMap to Replace the Router Configuration Template
You can use a ConfigMap to customize the router instance without rebuilding the router image. The haproxy-config.template, reload-haproxy, and other scripts can be modified as well as creating and modifying router environment variables.
- Copy the haproxy-config.template that you want to modify as described above. Modify it as desired.
Create a ConfigMap:
$ oc create configmap customrouter --from-file=haproxy-config.template
The
customrouter
ConfigMap now contains a copy of the modified haproxy-config.template file.Modify the router deployment configuration to mount the ConfigMap as a file and point the
TEMPLATE_FILE
environment variable to it. This can be done viaoc set env
andoc volume
commands, or alternatively by editing the router deployment configuration.- Using
oc
commands $ oc set env dc/router \ TEMPLATE_FILE=/var/lib/haproxy/conf/custom/haproxy-config.template $ oc volume dc/router --add --overwrite \ --name=config-volume \ --mount-path=/var/lib/haproxy/conf/custom \ --source='{"configMap": { "name": "customrouter"}}'
- Editing the Router Deployment Configuration
Use
oc edit dc router
to edit the router deployment configuration with a text editor.... - name: STATS_USERNAME value: admin - name: TEMPLATE_FILE 1 value: /var/lib/haproxy/conf/custom/haproxy-config.template image: openshift/origin-haproxy-routerp ... terminationMessagePath: /dev/termination-log volumeMounts: 2 - mountPath: /var/lib/haproxy/conf/custom name: config-volume dnsPolicy: ClusterFirst ... terminationGracePeriodSeconds: 30 volumes: 3 - configMap: name: customrouter name: config-volume test: false ...
Save the changes and exit the editor. This restarts the router.
- Using
4.3.5. Using Stick Tables
The following example customization can be used in a highly-available routing setup to use stick-tables that synchronize between peers.
Adding a Peer Section
In order to synchronize stick-tables amongst peers you must a define a peers section in your HAProxy configuration. This section determines how HAProxy will identify and connect to peers. The plug-in provides data to the template under the .PeerEndpoints
variable to allow you to easily identify members of the router service. You may add a peer section to the haproxy-config.template file inside the router image by adding:
{{ if (len .PeerEndpoints) gt 0 }} peers openshift_peers {{ range $endpointID, $endpoint := .PeerEndpoints }} peer {{$endpoint.TargetName}} {{$endpoint.IP}}:1937 {{ end }} {{ end }}
Changing the Reload Script
When using stick-tables, you have the option of telling HAProxy what it should consider the name of the local host in the peer section. When creating endpoints, the plug-in attempts to set the TargetName
to the value of the endpoint’s TargetRef.Name
. If TargetRef
is not set, it will set the TargetName
to the IP address. The TargetRef.Name
corresponds with the Kubernetes host name, therefore you can add the -L
option to the reload-haproxy
script to identify the local host in the peer section.
peer_name=$HOSTNAME 1
if [ -n "$old_pid" ]; then
/usr/sbin/haproxy -f $config_file -p $pid_file -L $peer_name -sf $old_pid
else
/usr/sbin/haproxy -f $config_file -p $pid_file -L $peer_name
fi
- 1
- Must match an endpoint target name that is used in the peer section.
Modifying Back Ends
Finally, to use the stick-tables within back ends, you can modify the HAProxy configuration to use the stick-tables and peer set. The following is an example of changing the existing back end for TCP connections to use stick-tables:
{{ if eq $cfg.TLSTermination "passthrough" }} backend be_tcp_{{$cfgIdx}} balance leastconn timeout check 5000ms stick-table type ip size 1m expire 5m{{ if (len $.PeerEndpoints) gt 0 }} peers openshift_peers {{ end }} stick on src {{ range $endpointID, $endpoint := $serviceUnit.EndpointTable }} server {{$endpointID}} {{$endpoint.IP}}:{{$endpoint.Port}} check inter 5000ms {{ end }} {{ end }}
After this modification, you can rebuild your router.
4.3.6. Rebuilding Your Router
In order to rebuild the router, you need copies of several files that are present on a running router. Make a work directory and copy the files from the router:
# mkdir - myrouter/conf # cd myrouter # oc get po NAME READY STATUS RESTARTS AGE router-2-40fc3 1/1 Running 0 11d # oc rsh router-2-40fc3 cat haproxy-config.template > conf/haproxy-config.template # oc rsh router-2-40fc3 cat error-page-503.http > conf/error-page-503.http # oc rsh router-2-40fc3 cat default_pub_keys.pem > conf/default_pub_keys.pem # oc rsh router-2-40fc3 cat ../Dockerfile > Dockerfile # oc rsh router-2-40fc3 cat ../reload-haproxy > reload-haproxy
You can edit or replace any of these files. However, conf/haproxy-config.template and reload-haproxy are the most likely to be modified.
After updating the files:
# docker build -t openshift/origin-haproxy-router-myversion . # docker tag openshift/origin-haproxy-router-myversion 172.30.243.98:5000/openshift/haproxy-router-myversion 1 # docker push 172.30.243.98:5000/openshift/origin-haproxy-router-pc:latest 2
To use the new router, edit the router deployment configuration either by changing the image: string or by adding the --images=<repo>/<image>:<tag>
flag to the oadm router
command.
When debugging the changes, it is helpful to set imagePullPolicy: Always
in the deployment configuration to force an image pull on each pod creation. When debugging is complete, you can change it back to imagePullPolicy: IfNotPresent
to avoid the pull on each pod start.
4.4. Configuring the HAProxy Router to Use the PROXY Protocol
4.4.1. Overview
By default, the HAProxy router expects incoming connections to unsecure, edge, and re-encrypt routes to use HTTP. However, you can configure the router to expect incoming requests by using the PROXY protocol instead. This topic describes how to configure the HAProxy router and an external load balancer to use the PROXY protocol.
4.4.2. Why Use the PROXY Protocol?
When an intermediary service such as a proxy server or load balancer forwards an HTTP request, it appends the source address of the connection to the request’s "Forwarded" header in order to provide this information to subsequent intermediaries and to the back-end service to which the request is ultimately forwarded. However, if the connection is encrypted, intermediaries cannot modify the "Forwarded" header. In this case, the HTTP header will not accurately communicate the original source address when the request is forwarded.
To solve this problem, some load balancers encapsulate HTTP requests using the PROXY protocol as an alternative to simply forwarding HTTP. Encapsulation enables the load balancer to add information to the request without modifying the forwarded request itself. In particular, this means that the load balancer can communicate the source address even when forwarding an encrypted connection.
The HAProxy router can be configured to accept the PROXY protocol and decapsulate the HTTP request. Because the router terminates encryption for edge and re-encrypt routes, the router can then update the "Forwarded" HTTP header (and related HTTP headers) in the request, appending any source address that is communicated using the PROXY protocol.
The PROXY protocol and HTTP are incompatible and cannot be mixed. If you use a load balancer in front of the router, both must use either the PROXY protocol or HTTP. Configuring one to use one protocol and the other to use the other protocol will cause routing to fail.
4.4.3. Using the PROXY Protocol
By default, the HAProxy router does not use the PROXY protocol. The router can be configured using the ROUTER_USE_PROXY_PROTOCOL
environment variable to expect the PROXY protocol for incoming connections:
Enable the PROXY Protocol
$ oc env dc/router ROUTER_USE_PROXY_PROTOCOL=true
Set the variable to any value other than true
or TRUE
to disable the PROXY protocol:
Disable the PROXY Protocol
$ oc env dc/router ROUTER_USE_PROXY_PROTOCOL=false
If you enable the PROXY protocol in the router, you must configure your load balancer in front of the router to use the PROXY protocol as well. Following is an example of configuring Amazon’s Elastic Load Balancer (ELB) service to use the PROXY protocol. This example assumes that ELB is forwarding ports 80 (HTTP), 443 (HTTPS), and 5000 (for the image registry) to the router running on one or more EC2 instances.
Configure Amazon ELB to Use the PROXY Protocol
To simplify subsequent steps, first set some shell variables:
$ lb='infra-lb' 1 $ instances=( 'i-079b4096c654f563c' ) 2 $ secgroups=( 'sg-e1760186' ) 3 $ subnets=( 'subnet-cf57c596' ) 4
Next, create the ELB with the appropriate listeners, security groups, and subnets.
NoteYou must configure all listeners to use the TCP protocol, not the HTTP protocol.
$ aws elb create-load-balancer --load-balancer-name "$lb" \ --listeners \ 'Protocol=TCP,LoadBalancerPort=80,InstanceProtocol=TCP,InstancePort=80' \ 'Protocol=TCP,LoadBalancerPort=443,InstanceProtocol=TCP,InstancePort=443' \ 'Protocol=TCP,LoadBalancerPort=5000,InstanceProtocol=TCP,InstancePort=5000' \ --security-groups $secgroups \ --subnets $subnets { "DNSName": "infra-lb-2006263232.us-east-1.elb.amazonaws.com" }
Register your router instance or instances with the ELB:
$ aws elb register-instances-with-load-balancer --load-balancer-name "$lb" \ --instances $instances { "Instances": [ { "InstanceId": "i-079b4096c654f563c" } ] }
Configure the ELB’s health check:
$ aws elb configure-health-check --load-balancer-name "$lb" \ --health-check 'Target=HTTP:1936/healthz,Interval=30,UnhealthyThreshold=2,HealthyThreshold=2,Timeout=5' { "HealthCheck": { "HealthyThreshold": 2, "Interval": 30, "Target": "HTTP:1936/healthz", "Timeout": 5, "UnhealthyThreshold": 2 } }
Finally, create a load-balancer policy with the
ProxyProtocol
attribute enabled, and configure it on the ELB’s TCP ports 80 and 443:$ aws elb create-load-balancer-policy --load-balancer-name "$lb" \ --policy-name "${lb}-ProxyProtocol-policy" \ --policy-type-name 'ProxyProtocolPolicyType' \ --policy-attributes 'AttributeName=ProxyProtocol,AttributeValue=true' $ for port in 80 443 do aws elb set-load-balancer-policies-for-backend-server \ --load-balancer-name "$lb" \ --instance-port "$port" \ --policy-names "${lb}-ProxyProtocol-policy" done
Verify the Configuration
You can examine the load balancer as follows to verify that the configuration is correct:
$ aws elb describe-load-balancers --load-balancer-name "$lb" | jq '.LoadBalancerDescriptions| [.[]|.ListenerDescriptions]' [ [ { "Listener": { "InstancePort": 80, "LoadBalancerPort": 80, "Protocol": "TCP", "InstanceProtocol": "TCP" }, "PolicyNames": ["infra-lb-ProxyProtocol-policy"] 1 }, { "Listener": { "InstancePort": 443, "LoadBalancerPort": 443, "Protocol": "TCP", "InstanceProtocol": "TCP" }, "PolicyNames": ["infra-lb-ProxyProtocol-policy"] 2 }, { "Listener": { "InstancePort": 5000, "LoadBalancerPort": 5000, "Protocol": "TCP", "InstanceProtocol": "TCP" }, "PolicyNames": [] 3 } ] ]
Alternatively, if you already have an ELB configured, but it is not configured to use the PROXY protocol, you will need to change the existing listener for TCP port 80 to use the TCP protocol instead of HTTP (TCP port 443 should already be using the TCP protocol):
$ aws elb delete-load-balancer-listeners --load-balancer-name "$lb" \ --load-balancer-ports 80 $ aws elb create-load-balancer-listeners --load-balancer-name "$lb" \ --listeners 'Protocol=TCP,LoadBalancerPort=80,InstanceProtocol=TCP,InstancePort=80'
Verify the Protocol Updates
Verify that the protocol has been updated as follows:
$ aws elb describe-load-balancers --load-balancer-name "$lb" |
jq '[.LoadBalancerDescriptions[]|.ListenerDescriptions]'
[
[
{
"Listener": {
"InstancePort": 443,
"LoadBalancerPort": 443,
"Protocol": "TCP",
"InstanceProtocol": "TCP"
},
"PolicyNames": []
},
{
"Listener": {
"InstancePort": 5000,
"LoadBalancerPort": 5000,
"Protocol": "TCP",
"InstanceProtocol": "TCP"
},
"PolicyNames": []
},
{
"Listener": {
"InstancePort": 80,
"LoadBalancerPort": 80,
"Protocol": "TCP", 1
"InstanceProtocol": "TCP"
},
"PolicyNames": []
}
]
]
- 1
- All listeners, including the listener for TCP port 80, should be using the TCP protocol.
Then, create a load-balancer policy and add it to the ELB as described in Step 5 above.
4.5. Using the F5 Router Plug-in
4.5.1. Overview
The F5 router plug-in is available starting in OpenShift Container Platform 3.0.2.
The F5 router plug-in is provided as a container image and run as a pod, just like the default HAProxy router. Deploying the F5 router is done similarly as well, using the oadm router
command but providing additional flags (or environment variables) to specify the following parameters for the F5 BIG-IP® host:
Flag | Description |
---|---|
|
Specifies that an F5 router should be launched (the default |
| Specifies the F5 BIG-IP® host’s management interface’s host name or IP address. |
| Specifies the F5 BIG-IP® user name (typically admin). |
| Specifies the F5 BIG-IP® password. |
| Specifies the name of the F5 virtual server for HTTP connections. |
| Specifies the name of the F5 virtual server for HTTPS connections. |
| Specifies the path to the SSH private key file for the F5 BIG-IP® host. Required to upload and delete key and certificate files for routes. |
| A Boolean flag that indicates that the F5 router should skip strict certificate verification with the F5 BIG-IP® host. |
As with the HAProxy router, the oadm router
command creates the service and deployment configuration objects, and thus the replication controllers and pod(s) in which the F5 router itself runs. The replication controller restarts the F5 router in case of crashes. Because the F5 router is only watching routes and endpoints and configuring F5 BIG-IP® accordingly, running the F5 router in this way along with an appropriately configured F5 BIG-IP® deployment should satisfy high-availability requirements.
4.5.2. Deploying the F5 Router
The F5 router must be run in privileged mode because route certificates get copied using scp
:
$ oadm policy remove-scc-from-user hostnetwork -z router $ oadm policy add-scc-to-user privileged -z router
To deploy the F5 router:
- First, establish a tunnel using a ramp node, which allows for the routing of traffic to pods through the OpenShift Container Platform SDN.
Run the
oadm router
command with the appropriate flags. For example:$ oadm router \ --type=f5-router \ --external-host=10.0.0.2 \ --external-host-username=admin \ --external-host-password=mypassword \ --external-host-http-vserver=ose-vserver \ --external-host-https-vserver=https-ose-vserver \ --external-host-private-key=/path/to/key \ --service-account=router
Chapter 5. Upgrading a Cluster
5.1. Overview
When new versions of OpenShift Container Platform are released, you can upgrade your existing cluster to apply the latest enhancements and bug fixes. This includes upgrading from previous minor versions, such as release 3.2 to 3.3, and applying asynchronous errata updates within a minor version (3.3.z releases). See the OpenShift Container Platform 3.3 Release Notes to review the latest changes.
Due to the core architectural changes between the major versions, OpenShift Enterprise 2 environments cannot be upgraded to OpenShift Container Platform 3 and require a fresh installation.
Unless noted otherwise, node and masters within a major version are forward and backward compatible across one minor version, so upgrading your cluster should go smoothly. However, you should not run mismatched versions longer than necessary to upgrade the entire cluster.
5.1.1. In-place or Blue-Green Upgrades
There are two methods for performing OpenShift Container Platform cluster upgrades. You can either do in-place upgrades (automated or manual), or upgrade using a blue-green deployment method.
In-place Upgrades
With in-place upgrades, the cluster upgrade is performed on all hosts in a single cluster. If you installed using the quick or advanced installation and the ~/.config/openshift/installer.cfg.yml or inventory file that was used is available, you can perform an automated in-place upgrade. Alternatively, you can upgrade in-place manually.
Blue-green Deployments
With blue-green deployments, you can reduce downtime caused while upgrading an environment by creating a parallel environment on which the new deployment can be installed. If a problem is detected, and after the new deployment is verified, traffic can be switched over with the option to rollback.
5.2. Performing Automated In-place Cluster Upgrades
5.2.1. Overview
If you installed using the advanced installation and the inventory file that was used is available, you can use the upgrade playbook to automate the OpenShift cluster upgrade process. If you installed using the quick installation method and a ~/.config/openshift/installer.cfg.yml file is available, you can use the installer to perform the automated upgrade.
The automated upgrade performs the following steps for you:
- Applies the latest configuration.
- Upgrades and restart master services.
- Upgrades and restart node services.
- Applies the latest cluster policies.
- Updates the default router if one exists.
- Updates the default registry if one exists.
- Updates default image streams and InstantApp templates.
Ensure that you have met all prerequisites before proceeding with an upgrade. Failure to do so can result in a failed upgrade.
Running Ansible playbooks with the --tags
or --check
options is not supported by Red Hat.
5.2.2. Preparing for an Automated Upgrade
Before upgrading your cluster to OpenShift Container Platform 3.3, the cluster must be already upgraded to the latest asynchronous release of version 3.2. Cluster upgrades cannot span more than one minor version at a time, so if your cluster is at version 3.0 or 3.1, you must first upgrade incrementally (e.g., 3.0 to 3.1, then 3.1 or 3.2).
To prepare for an automated upgrade:
If you are upgrading from version 3.2 to 3.3, manually disable the 3.2 channel and enable the 3.3 channel on each master and node host:
# subscription-manager repos --disable="rhel-7-server-ose-3.2-rpms" \ --enable="rhel-7-server-ose-3.3-rpms"\ --enable="rhel-7-server-rpms" \ --enable="rhel-7-server-extras-rpms" # yum clean all
For any upgrade path, always ensure that you have the latest version of the atomic-openshift-utils package, which should also update the openshift-ansible-* packages:
# yum update atomic-openshift-utils
Install or update to the following latest available *-excluder packages on each RHEL 7 system, which helps ensure your systems stay on the correct versions of atomic-openshift and docker packages when you are not trying to upgrade, according to the OpenShift Container Platform version:
# yum install atomic-openshift-excluder atomic-openshift-docker-excluder
These packages add entries to the
exclude
directive in the host’s /etc/yum.conf file.You must be logged in as a cluster administrative user on the master host for the upgrade to succeed:
$ oc login
After satisfying these steps, there are two methods for running the automated upgrade:
Choose and follow one of these methods.
5.2.3. Using the Installer to Upgrade
If you installed OpenShift Container Platform using the quick installation method, you should have an installation configuration file located at ~/.config/openshift/installer.cfg.yml. The installer requires this file to start an upgrade.
The installer supports upgrading between minor versions of OpenShift Container Platform (one minor version at a time, e.g., 3.2 to 3.3) as well as between asynchronous errata updates within a minor version (e.g., 3.3.z).
If you have an older format installation configuration file in ~/.config/openshift/installer.cfg.yml from an installation of a previous cluster version, the installer will attempt to upgrade the file to the new supported format. If you do not have an installation configuration file of any format, you can create one manually.
To start an upgrade with the quick installer:
- Satisfy the steps in Preparing for an Automated Upgrade to ensure you are using the latest upgrade playbooks.
Run the installer with the
upgrade
subcommand:# atomic-openshift-installer upgrade
- Then, follow the on-screen instructions to upgrade to the latest release.
- After all master and node upgrades have completed, a recommendation will be printed to reboot all hosts.
After rebooting, if there are no additional features enabled, you can verify the upgrade. Otherwise, the next step depends on what additional features have you previously enabled.
Feature Next Step Aggregated Logging
Cluster Metrics
5.2.4. Running the Upgrade Playbook Directly
You can run the automated upgrade playbook using Ansible directly, similar to the advanced installation method, if you have an inventory file.
The same v3_3 upgrade playbook can be used to upgrade either of the following to the latest 3.3 release:
5.2.4.1. Upgrading to OpenShift Container Platform 3.3
To run an upgrade from OpenShift Container Platform 3.2 to 3.3:
- Satisfy the steps in Preparing for an Automated Upgrade to ensure you are using the latest upgrade playbooks.
-
Ensure the
deployment_type
parameter in your inventory file is set toopenshift-enterprise
. -
If you have multiple masters configured and want to enable rolling, full system restarts of the hosts, you can set the
openshift_rolling_restart_mode
parameter in your inventory file tosystem
. Otherwise, the default valueservices
performs rolling service restarts on HA masters, but does not reboot the systems. See Configuring Cluster Variables for details. Run the v3_3 upgrade playbook. If your inventory file is located somewhere other than the default /etc/ansible/hosts, add the
-i
flag to specify the location. If you previously used theatomic-openshift-installer
command to run your installation, you can check ~/.config/openshift/hosts (previously located at ~/.config/openshift/.ansible/hosts) for the last inventory file that was used, if needed.# ansible-playbook [-i </path/to/inventory/file>] \ /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_3/upgrade.yml
- After all master and node upgrades have completed, a recommendation will be printed to reboot all hosts.
After rebooting, if there are no additional features enabled, you can verify the upgrade. Otherwise, the next step depends on what additional features have you previously enabled.
Feature Next Step Aggregated Logging
Cluster Metrics
5.2.4.2. Upgrading to OpenShift Container Platform 3.3 Asynchronous Releases
To apply asynchronous errata updates to an existing OpenShift Container Platform 3.3 cluster:
- Satisfy the steps in Preparing for an Automated Upgrade to ensure you are using the latest upgrade playbooks.
Run the v3_3 upgrade playbook (the same playbook that is used for upgrading from OpenShift Container Platform 3.2 to 3.3). If your inventory file is located somewhere other than the default /etc/ansible/hosts, add the
-i
flag to specify the location. If you previously used theatomic-openshift-installer
command to run your installation, you can check ~/.config/openshift/hosts (previously located at ~/.config/openshift/.ansible/hosts) for the last inventory file that was used, if needed.# ansible-playbook [-i </path/to/inventory/file>] \ /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_3/upgrade.yml
- After all master and node upgrades have completed, a recommendation will be printed to reboot all hosts.
After rebooting, if there are no additional features enabled, you can verify the upgrade. Otherwise, the next step depends on what additional features have you previously enabled.
Feature Next Step Aggregated Logging
Cluster Metrics
5.2.5. Upgrading the EFK Logging Stack
If you have previously deployed the EFK logging stack and want to upgrade to the latest logging component images, the steps must be performed manually as shown in Manual Upgrades.
5.2.6. Upgrading Cluster Metrics
If you have previously deployed cluster metrics, you must manually update to the latest metric components.
5.2.7. Verifying the Upgrade
To verify the upgrade:
First check that all nodes are marked as Ready:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
Then, verify that you are running the expected versions of the docker-registry and router images, if deployed. Replace
<tag>
withv3.3.1.25
for the latest version.# oc get -n default dc/docker-registry -o json | grep \"image\" "image": "openshift3/ose-docker-registry:<tag>", # oc get -n default dc/router -o json | grep \"image\" "image": "openshift3/ose-haproxy-router:<tag>",
After upgrading, you can use the diagnostics tool on the master to look for common issues:
# oadm diagnostics ... [Note] Summary of diagnostics execution: [Note] Completed with no errors or warnings seen.
5.3. Performing Manual In-place Cluster Upgrades
5.3.1. Overview
As an alternative to performing an automated upgrade, you can manually upgrade your OpenShift cluster. To manually upgrade without disruption, it is important to upgrade each component as documented in this topic.
Before you begin your upgrade, familiarize yourself now with the entire procedure. Specific releases may require additional steps to be performed at key points before or during the standard upgrade process.
Ensure that you have met all prerequisites before proceeding with an upgrade. Failure to do so can result in a failed upgrade.
5.3.2. Preparing for a Manual Upgrade
Before upgrading your cluster to OpenShift Container Platform 3.3, the cluster must be already upgraded to the latest asynchronous release of version 3.2. Cluster upgrades cannot span more than one minor version at a time, so if your cluster is at version 3.0 or 3.1, you must first upgrade incrementally (e.g., 3.0 to 3.1, then 3.1 or 3.2).
To prepare for a manual upgrade, follow these steps:
If you are upgrading from version 3.2 to 3.3, manually disable the 3.2 channel and enable the 3.3 channel on each host:
# subscription-manager repos --disable="rhel-7-server-ose-3.2-rpms" \ --enable="rhel-7-server-ose-3.3-rpms" \ --enable="rhel-7-server-extras-rpms"
On RHEL 7 systems, also clear the yum cache:
# yum clean all
Install or update to the latest available version of the atomic-openshift-utils package on each RHEL 7 system, which provides files that will be used in later sections:
# yum install atomic-openshift-utils
Install or update to the following latest available *-excluder packages on each RHEL 7 system, which helps ensure your systems stay on the correct versions of atomic-openshift and docker packages when you are not trying to upgrade, according to the OpenShift Container Platform version:
# yum install atomic-openshift-excluder atomic-openshift-docker-excluder
These packages add entries to the
exclude
directive in the host’s /etc/yum.conf file.Create an etcd backup on each master. The etcd package is required, even if using embedded etcd, for access to the
etcdctl
command to make the backup. The package is installed by default for RHEL Atomic Host 7 systems. If the master is a RHEL 7 system, ensure the package is installed:# yum install etcd
Then, create the backup:
# ETCD_DATA_DIR=/var/lib/origin/openshift.local.etcd 1 # etcdctl backup \ --data-dir $ETCD_DATA_DIR \ --backup-dir $ETCD_DATA_DIR.bak.<date> 2
For any upgrade path, ensure that you are running the latest kernel on each RHEL 7 system:
# yum update kernel
5.3.3. Upgrading Master Components
Upgrade your master hosts first:
Run the following command on each master to remove the atomic-openshift packages from the list of yum excludes on the host:
# atomic-openshift-excluder unexclude
Upgrade the atomic-openshift packages or related images.
For masters using the RPM-based method on a RHEL 7 system, upgrade all installed atomic-openshift packages:
# yum upgrade atomic-openshift\*
For masters using the containerized method on a RHEL 7 or RHEL Atomic Host 7 system, set the
IMAGE_VERSION
parameter to the version you are upgrading to in the following files:- /etc/sysconfig/atomic-openshift-master (single master clusters only)
- /etc/sysconfig/atomic-openshift-master-controllers (multi-master clusters only)
- /etc/sysconfig/atomic-openshift-master-api (multi-master clusters only)
- /etc/sysconfig/atomic-openshift-node
/etc/sysconfig/atomic-openshift-openvswitch
For example:
IMAGE_VERSION=<tag>
Replace
<tag>
withv3.3
for the latest version.
In OpenShift Container Platform 3.3, protocol buffers are used by default for internal communications between node, masters, and controllers. To configure this, the following stanzas must be altered in the /etc/origin/master-config.yaml file on each master:
masterClients: externalKubernetesClientConnectionOverrides: acceptContentTypes: application/vnd.kubernetes.protobuf,application/json contentType: application/vnd.kubernetes.protobuf burst: 400 qps: 200 externalKubernetesKubeConfig: "" openshiftLoopbackClientConnectionOverrides: acceptContentTypes: application/vnd.kubernetes.protobuf,application/json contentType: application/vnd.kubernetes.protobuf burst: 600 qps: 300 openshiftLoopbackKubeConfig: openshift-master.kubeconfig
For more information on protocol buffers, see https://developers.google.com/protocol-buffers/docs/overview.
-
In OpenShift Container Platform 3.3, the
kubernetesMasterConfig.admissionConfig.pluginConfig
parameter in the /etc/origin/master-config.yaml file is being deprecated. If you are upgrading from version 3.2 to 3.3 and this parameter is in use, see General Admission Rules for guidance on moving and merging intoadmissionConfig.pluginConfig
. Restart the master service(s) on each master and review logs to ensure they restart successfully.
For single master clusters:
# systemctl restart atomic-openshift-master # journalctl -r -u atomic-openshift-master
For multi-master clusters:
# systemctl restart atomic-openshift-master-controllers # systemctl restart atomic-openshift-master-api # journalctl -r -u atomic-openshift-master-controllers # journalctl -r -u atomic-openshift-master-api
Because masters also have node components running on them in order to be configured as part of the OpenShift SDN, restart the atomic-openshift-node and openvswitch services:
# systemctl restart atomic-openshift-node # systemctl restart openvswitch # journalctl -r -u openvswitch # journalctl -r -u atomic-openshift-node
Run the following command on each master to add the atomic-openshift packages back to the list of yum excludes on the host:
# atomic-openshift-excluder exclude
Upgrade any external etcd hosts using the RPM-based method on a RHEL 7 system:
Upgrade the etcd package:
# yum update etcd
Restart the etcd service and review the logs to ensure it restarts successfully:
# systemctl restart etcd # journalctl -r -u etcd
During the cluster upgrade, it can sometimes be useful to take a master out of rotation since some DNS client libraries will not properly to the other masters for cluster DNS. In addition to stopping the master and controller services, you can remove the EndPoint from the Kubernetes service’s subsets.addresses
.
$ oc edit ep/kubernetes -n default
When the master is restarted, the Kubernetes service will be automatically updated.
5.3.4. Updating Policy Definitions
After a cluster upgrade, the recommended default cluster roles may be updated. To check if an update is recommended for your environment, you can run:
# oadm policy reconcile-cluster-roles
If you have customized default cluster roles and want to ensure a role reconciliation does not modify those customized roles, annotate them with openshift.io/reconcile-protect
set to true
. Doing so means you are responsible for manually updating those roles with any new or required permissions during upgrades.
This command outputs a list of roles that are out of date and their new proposed values. For example:
# oadm policy reconcile-cluster-roles apiVersion: v1 items: - apiVersion: v1 kind: ClusterRole metadata: creationTimestamp: null name: admin rules: - attributeRestrictions: null resources: - builds/custom ...
Your output will vary based on the OpenShift version and any local customizations you have made. Review the proposed policy carefully.
You can either modify this output to re-apply any local policy changes you have made, or you can automatically apply the new policy using the following process:
Reconcile the cluster roles:
# oadm policy reconcile-cluster-roles \ --additive-only=true \ --confirm
Reconcile the cluster role bindings:
# oadm policy reconcile-cluster-role-bindings \ --exclude-groups=system:authenticated \ --exclude-groups=system:authenticated:oauth \ --exclude-groups=system:unauthenticated \ --exclude-users=system:anonymous \ --additive-only=true \ --confirm
Reconcile security context constraints:
# oadm policy reconcile-sccs \ --additive-only=true \ --confirm
5.3.5. Upgrading Nodes
After upgrading your masters, you can upgrade your nodes. When restarting the atomic-openshift-node service, there will be a brief disruption of outbound network connectivity from running pods to services while the service proxy is restarted. The length of this disruption should be very short and scales based on the number of services in the entire cluster.
Blue-green deployments are another proven approach to reducing downtime caused while updating an environment.
One at at time for each node that is not also a master, you must disable scheduling and evacuate its pods to other nodes, then upgrade packages and restart services.
Run the following command on each node to remove the atomic-openshift packages from the list of yum excludes on the host:
# atomic-openshift-excluder unexclude
As a user with cluster-admin privileges, disable scheduling for the node:
# oadm manage-node <node> --schedulable=false
Evacuate pods on the node to other nodes:
ImportantThe
--force
option deletes any pods that are not backed by a replication controller.# oadm manage-node <node> --evacuate --force
Upgrade the node component packages or related images.
For nodes using the RPM-based method on a RHEL 7 system, upgrade all installed atomic-openshift packages:
# yum upgrade atomic-openshift\*
For nodes using the containerized method on a RHEL 7 or RHEL Atomic Host 7 system, set the
IMAGE_VERSION
parameter in the /etc/sysconfig/atomic-openshift-node and /etc/sysconfig/openvswitch files to the version you are upgrading to. For example:IMAGE_VERSION=<tag>
Replace
<tag>
withv3.3
for the latest version.
In OpenShift Container Platform 3.3, protocol buffers are used by default for internal communications between node, masters, and controllers. To configure this, the following stanzas must be altered in the /etc/origin/node-config.yaml file on each node:
masterClientConnectionOverrides: acceptContentTypes: application/vnd.kubernetes.protobuf,application/json contentType: application/vnd.kubernetes.protobuf burst: 200 qps: 100
For more information on protocol buffers, see https://developers.google.com/protocol-buffers/docs/overview.
Restart the atomic-openshift-node and openvswitch services and review the logs to ensure they restart successfully:
# systemctl restart atomic-openshift-node # systemctl restart openvswitch # journalctl -r -u atomic-openshift-node # journalctl -r -u openvswitch
Re-enable scheduling for the node:
# oadm manage-node <node> --schedulable
Run the following command on the node to add the atomic-openshift packages back to the list of yum excludes on the host:
# atomic-openshift-excluder exclude
- Repeat these steps on the next node, and continue repeating these steps until all nodes have been upgraded.
After all nodes have been upgraded, as a user with cluster-admin privileges, verify that all nodes are showing as Ready:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
5.3.6. Upgrading the Router
If you have previously deployed a router, the router deployment configuration must be upgraded to apply updates contained in the router image. To upgrade your router without disrupting services, you must have previously deployed a highly-available routing service.
If you previously customized your HAProxy routing template, then, depending on the changes, additional steps may be required due to changes in the routing data structure starting in OpenShift Container Platform 3.3. See Routing Data Structure Changes in the OpenShift Container Platform 3.3 Release Notes for details.
Edit your router’s deployment configuration. For example, if it has the default router name:
# oc edit dc/router
Apply the following changes:
...
spec:
template:
spec:
containers:
- env:
...
image: registry.access.redhat.com/openshift3/ose-haproxy-router:<tag> 1
imagePullPolicy: IfNotPresent
...
- 1
- Adjust
<tag>
to match the version you are upgrading to (usev3.3
for the latest version).
You should see one router pod updated and then the next.
5.3.7. Upgrading the Registry
The registry must also be upgraded for changes to take effect in the registry image. If you have used a PersistentVolumeClaim
or a host mount point, you may restart the registry without losing the contents of your registry. Storage for the Registry details how to configure persistent storage for the registry.
Edit your registry’s deployment configuration:
# oc edit dc/docker-registry
Apply the following changes:
...
spec:
template:
spec:
containers:
- env:
...
image: registry.access.redhat.com/openshift3/ose-docker-registry:<tag> 1
imagePullPolicy: IfNotPresent
...
- 1
- Adjust
<tag>
to match the version you are upgrading to (usev3.3
for the latest version).
Images that are being pushed or pulled from the internal registry at the time of upgrade will fail and should be restarted automatically. This will not disrupt pods that are already running.
5.3.7.1. Updating Custom Registry Configuration Files
You may safely skip this part if you do not use a custom registry configuration file.
The internal Docker registry version 3.3.0 and higher requires following entries in the middleware section of the configuration file:
middleware: registry: - name: openshift repository: - name: openshift storage: - name: openshift
- Edit your custom configuration file, adding the missing entries.
- Deploy your updated configuration.
-
Append the
--overwrite
flag tooc volume dc/docker-registry --add
to replace a volume mount of your previous secret. - You can safely remove the old secret.
5.3.7.2. Enforcing Quota in the Registry
Quota must be enforced to prevent layer blobs that exceed the size limit from being written to the registry’s storage. This can be achieved via a configuration file:
... middleware: repository: - name: openshift options: enforcequota: true ...
Alternatively, use the REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_ENFORCEQUOTA
environment variable, which is set to true
for the new registry deployments by default. Existing deployments need to be modified using:
# oc set env dc/docker-registry REGISTRY_MIDDLEWARE_REPOSITORY_OPENSHIFT_ENFORCEQUOTA=true
5.3.8. Updating the Default Image Streams and Templates
By default, the quick and advanced installation methods automatically create default image streams, InstantApp templates, and database service templates in the openshift project, which is a default project to which all users have view access. These objects were created during installation from the JSON files located under the /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/ directory.
Because RHEL Atomic Host 7 cannot use yum to update packages, the following steps must take place on a RHEL 7 system.
Update the packages that provide the example JSON files. On a subscribed Red Hat Enterprise Linux 7 system where you can run the CLI as a user with cluster-admin permissions, install or update to the latest version of the atomic-openshift-utils package, which should also update the openshift-ansible- packages:
# yum update atomic-openshift-utils
The openshift-ansible-roles package provides the latest example JSON files.
After a manual upgrade, get the latest templates from openshift-ansible-roles:
rpm -ql openshift-ansible-roles | grep examples | grep v1.3
In this example, /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/image-streams/image-streams-rhel7.json is the latest file that you want in the latest openshift-ansible-roles package.
/usr/share/openshift/examples/image-streams/image-streams-rhel7.json is not owned by a package, but is updated by Ansible. If you are upgrading outside of Ansible. you need to get the latest .json files on the system where you are running
oc
, which can run anywhere that has access to the master.Install atomic-openshift-utils and its dependencies to install the new content into /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/.:
$ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/image-streams/image-streams-rhel7.json $ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/image-streams/dotnet_imagestreams.json $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/image-streams/image-streams-rhel7.json $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/image-streams/dotnet_imagestreams.json
Update the templates:
$ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/ $ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/db-templates/ $ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/infrastructure-templates/ $ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/xpaas-templates/ $ oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/xpaas-streams/ $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/ $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/db-templates/ $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/infrastructure-templates/ $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/xpaas-templates/ $ oc replace -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/xpaas-streams/
Errors are generated for items that already exist. This is expected behavior:
# oc create -n openshift -f /usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/ Error from server: error when creating "/usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/cakephp-mysql.json": templates "cakephp-mysql-example" already exists Error from server: error when creating "/usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/cakephp.json": templates "cakephp-example" already exists Error from server: error when creating "/usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/dancer-mysql.json": templates "dancer-mysql-example" already exists Error from server: error when creating "/usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/dancer.json": templates "dancer-example" already exists Error from server: error when creating "/usr/share/ansible/openshift-ansible/roles/openshift_examples/files/examples/v1.3/quickstart-templates/django-postgresql.json": templates "django-psql-example" already exists
Now, content can be updated. Without running the automated upgrade playbooks, the content is not updated in /usr/share/openshift/.
5.3.9. Importing the Latest Images
After updating the default image streams, you may also want to ensure that the images within those streams are updated. For each image stream in the default openshift project, you can run:
# oc import-image -n openshift <imagestream>
For example, get the list of all image streams in the default openshift project:
# oc get is -n openshift NAME DOCKER REPO TAGS UPDATED mongodb registry.access.redhat.com/openshift3/mongodb-24-rhel7 2.4,latest,v3.1.1.6 16 hours ago mysql registry.access.redhat.com/openshift3/mysql-55-rhel7 5.5,latest,v3.1.1.6 16 hours ago nodejs registry.access.redhat.com/openshift3/nodejs-010-rhel7 0.10,latest,v3.1.1.6 16 hours ago ...
Update each image stream one at a time:
# oc import-image -n openshift nodejs The import completed successfully. Name: nodejs Created: 10 seconds ago Labels: <none> Annotations: openshift.io/image.dockerRepositoryCheck=2016-07-05T19:20:30Z Docker Pull Spec: 172.30.204.22:5000/openshift/nodejs Tag Spec Created PullSpec Image latest 4 9 seconds ago registry.access.redhat.com/rhscl/nodejs-4-rhel7:latest 570ad8ed927fd5c2c9554ef4d9534cef808dfa05df31ec491c0969c3bd372b05 4 registry.access.redhat.com/rhscl/nodejs-4-rhel7:latest 9 seconds ago <same> 570ad8ed927fd5c2c9554ef4d9534cef808dfa05df31ec491c0969c3bd372b05 0.10 registry.access.redhat.com/openshift3/nodejs-010-rhel7:latest 9 seconds ago <same> a1ef33be788a28ec2bdd48a9a5d174ebcfbe11c8e986d2996b77f5bccaaa4774
In order to update your S2I-based applications, you must manually trigger a new build of those applications after importing the new images using oc start-build <app-name>
.
5.3.10. Upgrading the EFK Logging Stack
Use the following to upgrade an already-deployed EFK logging stack.
The following steps apply when upgrading to OpenShift Container Platform 3.3+.
Ensure you are working in the project where the EFK stack was previously deployed. For example, if the project is named logging:
$ oc project logging
Recreate the deployer templates for service accounts and running the deployer:
$ oc apply -n openshift -f \ usr/share/ansible/openshift-ansible/roles/openshift_hosted_templates/files/v1.3/enterprise/metrics-deployer.yaml
Generate any missing service accounts and roles:
$ oc process logging-deployer-account-template | oc apply -f -
Ensure that the cluster role
oauth-editor
is assigned to the logging-deployer service account:$ oadm policy add-cluster-role-to-user oauth-editor \ system:serviceaccount:logging:logging-deployer
In preparation for running the deployer, ensure that you have the configurations for your current deployment in the logging-deployer ConfigMap.
ImportantEnsure that your image version is the latest version, not the currently installed version.
Run the deployer with the parameter in
upgrade
mode:$ oc new-app logging-deployer-template -p MODE=upgrade
Running the deployer in this mode handles scaling down the components to minimize loss of logs, patching configurations, generating missing secrets and keys, and scaling the components back up to their previous replica count.
ImportantDue to the privileges needed to label and unlabel a node for controlling the deployment of Fluentd pods, the deployer does delete the logging-fluentd Daemonset and recreates it from the logging-fluentd-template template.
5.3.11. Upgrading Cluster Metrics
After upgrading an already-deployed Cluster Metrics install, you must update to a newer version of the metrics components.
- The update process stops all the metrics containers, updates the metrics configuration files, and redeploys the newer components.
- It does not change the metrics route.
- It does not delete the metrics persistent volume claim. Metrics stored to persistent volumes before the update are available after the update completes.
The update deletes all non-persisted metric values and overwrites local changes to the metrics configurations. For example, the number of instances in a replica set is not saved.
To update, follow the same steps as when the metrics components were first deployed, using the correct template, except this time, specify the MODE=refresh
option:
$ oc new-app -f metrics-deployer.yaml \
-p HAWKULAR_METRICS_HOSTNAME=hm.example.com,MODE=refresh 1
- 1
- In the original deployment command, there was no
MODE=refresh
.
During the update, the metrics components do not run. Because of this, they cannot collect data and a gap normally appears in the graphs.
5.3.12. Additional Manual Steps Per Release
Some OpenShift Container Platform releases may have additional instructions specific to that release that must be performed to fully apply the updates across the cluster. This section will be updated over time as new asynchronous updates are released for OpenShift Container Platform 3.3.
As of the latest 3.3 release (v3.3), there are no 3.3 asynchronous releases that require additional instructions during upgrade. See the OpenShift Container Platform 3.3 Release Notes to review the latest release notes.
5.3.13. Verifying the Upgrade
To verify the upgrade, first check that all nodes are marked as Ready:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
Then, verify that you are running the expected versions of the docker-registry and router images, if deployed. Replace <tag>
with v3.3
for the latest version.
# oc get -n default dc/docker-registry -o json | grep \"image\" "image": "openshift3/ose-docker-registry:<tag>", # oc get -n default dc/router -o json | grep \"image\" "image": "openshift3/ose-haproxy-router:<tag>",
After upgrading, you can use the diagnostics tool on the master to look for common issues:
# oadm diagnostics ... [Note] Summary of diagnostics execution: [Note] Completed with no errors or warnings seen.
5.4. Blue-Green Deployments
5.4.1. Overview
This topic serves as an alternative node upgrade method to the approach in Manual In-place Upgrades.
Blue-green deployments are a proven approach to reducing downtime caused while upgrading an environment. This is done by creating a parallel environment on which the new deployment can be installed. If a problem is detected, and after the new deployment is verified, traffic can be switched over with the option to rollback.
While blue-green is a valid strategy for deploying just about any software, there are always trade-offs. Not all environments have the same uptime requirements or the resources to properly perform blue-green deployments. In an OpenShift Container Platform environment, the most suitable candidate for blue-green deployments are the nodes. All user processes run on these systems and even critical pieces of OpenShift Container Platform infrastructure are self-hosted there. Uptime is most important for these workloads and the additional complexity of blue-green deployments can be justified. The exact implementation of this approach varies based on your requirements. Often the main challenge is having the excess capacity to facilitate such an approach.
Another lesser challenge is that the administrator must temporarily share the Red Hat software entitlements between the blue-green deployments or provide access to the installation content by means of a system such as Red Hat Satellite. This can be accomplished by sharing the consumer ID from the previous host.
5.4.2. Preparing for Upgrade
On the old host:
# subscription-manager identity | grep system system identity: 6699375b-06db-48c4-941e-689efd6ce3aa
On the new host:
# subscription-manager register --consumerid=6699375b-06db-48c4-941e-689efd6ce3aa
ImportantAfter a successful deployment, remember to unregister the old host with
subscription-manager clean
to prevent the environment from being out of compliance.After the master and etcd servers have been upgraded, you must ensure that your current production nodes are labeled either blue or green. In this example, the current installation will be blue and the new environment will be green. On each production node in your current installation:
$ oc label --all nodes color=blue
In the case of nodes requiring the uptime guarantees of a blue-green deployment, the
-l
flag can be used to match a subset of the environment using a selector.-
Create the new green environment for any nodes that are to be replaced by adding an equal number of new nodes to the existing cluster. Ansible can apply the
color=green
label using theopenshift_node_labels
variable for each node. -
In order to delay workload scheduling until the nodes are healthy, be sure to set the
openshift_schedulable=false
variable. After the green nodes are in Ready state, they can be made schedulable. Blue nodes are disabled so that no new pods are run on them:
# oadm manage-node --schedulable=true --selector=color=green # oadm manage-node --schedulable=false --selector=color=blue
A common practice is to scale the registry and router pods until they are migrated to the green nodes. For these pods, a canary deployment approach is commonly used. Scaling them up will make them immediately active on the new nodes. Pointing the deployment configuration to the new image initiates a rolling update. However, because of node anti-affinity, and the fact that the blue nodes are still unschedulable, the deployments to the old nodes will fail. At this point, the registry and router deployments can be scaled down to the original number of pods. At any given point, the original number of pods is still available so no capacity is lost.
5.4.3. Warming the New Nodes
In order for pods to be migrated from the blue environment to the green, the images must be pulled. Network latency and load on the registry can cause delays if there is not sufficient capacity built in to the environment. Often, the best way to minimize impact to the running system is to trigger new pod deployments that will land on the new nodes. Accomplish this by importing new image streams.
A major release of OpenShift Container Platform is the motivation for a blue-green deployment. At that time, new image streams become available for users of Source-to-Image (S2I). Upon import, any builds or deployments configured with ImageChangeTriggers are automatically created.
To continue with the upgrade process, update the default image streams and templates and import the latest images.
It is important to realize that this process can trigger a large number of builds. The good news is that the builds are performed on the green nodes and, therefore, do not impact any traffic on the blue deployment.
To monitor build progress across all namespaces (projects) in the cluster:
$ oc get events -w --all-namespaces
In large environments, builds rarely completely stop. However, you should see a large increase and decrease caused by the administrative import.
Another benefit of triggering the builds is that it does a fairly good job of fetching the majority of the ancillary images to all nodes such as the various build images, the pod infrastructure image, and deployers. Everything else can be moved over using node evacuation and will proceed more quickly as a result.
5.4.4. Node Evacuation
For larger deployments, it is possible to have other labels that help determine how evacuation can be coordinated. The most conservative approach for avoiding downtime is to evacuate one node at a time. If services are composed of pods using zone anti-affinity, then an entire zone can be evacuated at once. It is important to ensure that the storage volumes used are available in the new zone as this detail can vary among cloud providers.
In OpenShift Enterprise 3.2 and later, a node evacuation is triggered whenever the service is stopped. Achieve manual evacuation and deletion of all blue nodes at once by:
# oadm manage-node --selector=color=blue --evacuate # oc delete node --selector=color=blue
5.5. Operating System Updates and Upgrades
5.5.1. Updating and Upgrading the Operating System
Updating or upgrading your operating system (OS), by either changing OS versions or updating the system software, can impact the OpenShift Container Platform software running on those machines. In particular, these updates can affect the iptables
rules or ovs
flows that OpenShift Container Platform requires to operate.
Use the following to safely upgrade the OS on a host:
Ensure the host is unschedulable, meaning that no new pods will be placed onto the host:
$ oadm manage-node <node_name> --schedulable=false
Migrate the pods from the host:
$ oadm drain <node_name> --force --delete-local-data --ignore-daemonsets
Install or update the *-excluder packages on each host with the following. This ensures the hosts stay on the correct versions of OpenShift Container Platform, as per the atomic-openshift and docker packages, instead of the most current versions:
# yum install atomic-openshift-excluder atomic-openshift-docker-excluder
This adds entries to the
exclude
directive in the host’s /etc/yum.conf file.Update or upgrade the host packages, and reboot the host. A reboot ensures that the host is running the newest versions, and means that the
docker
and OpenShift Container Platform processes have been restarted, which will force them to check that all of the rules in other services are correct.However, instead of rebooting a node host, you can restart the services that are affected, or preserve the
iptables
state. Both processes are described in the OpenShift Container Platform IPtables topic. Theovs
flow rules do not need to be saved, but restarting the OpenShift Container Platform node software will fix the flow rules.Configure the host to be schedulable again:
$ oadm manage-node <node_name> --schedulable=true
Chapter 6. Downgrading OpenShift
6.1. Overview
Following an OpenShift Container Platform upgrade, it may be desirable in extreme cases to downgrade your cluster to a previous version. The following sections outline the required steps for each system in a cluster to perform such a downgrade for the OpenShift Container Platform 3.3 to 3.2 downgrade path.
These steps are currently only supported for RPM-based installations of OpenShift Container Platform and assumes downtime of the entire cluster.
6.2. Verifying Backups
The Ansible playbook used during the upgrade process should have created a backup of the master-config.yaml file and the etcd data directory. Ensure these exist on your masters and etcd members:
/etc/origin/master/master-config.yaml.<timestamp> /var/lib/origin/etcd-backup-<timestamp>
Also, back up the node-config.yaml file on each node (including masters, which have the node component on them) with a timestamp:
/etc/origin/node/node-config.yaml.<timestamp>
If you use a separate etcd cluster instead of a single embedded etcd instance, the backup is likely created on all etcd members, though only one is required for the recovery process. You can run a separate etcd instance that is co-located with your master nodes.
The RPM downgrade process in a later step should create .rpmsave backups of the following files, but it may be a good idea to keep a separate copy regardless:
/etc/sysconfig/atomic-openshift-master
/etc/etcd/etcd.conf 1
- 1
- Only required if using a separate etcd cluster.
6.3. Shutting Down the Cluster
On all masters, nodes, and etcd members, if you use a separate etcd cluster that runs on different nodes, ensure the relevant services are stopped.
On the master in a single master cluster:
# systemctl stop atomic-openshift-master
On each master in a multi-master cluster:
# systemctl stop atomic-openshift-master-api # systemctl stop atomic-openshift-master-controllers
On all master and node hosts:
# systemctl stop atomic-openshift-node
On any etcd hosts for a separate etcd cluster:
# systemctl stop etcd
6.4. Removing RPMs
The *-excluder packages add entries to the exclude directive in the host’s /etc/yum.conf file when installed. Run the following command on each host to remove the
atomic-openshift-*
anddocker
packages from the exclude list:# atomic-openshift-excluder unexclude # atomic-openshift-docker-excluder unexclude
On all masters, nodes, and etcd members, if you use a separate etcd cluster that runs on different nodes, remove the following packages:
# yum remove atomic-openshift \ atomic-openshift-clients \ atomic-openshift-node \ atomic-openshift-master \ openvswitch \ atomic-openshift-sdn-ovs \ tuned-profiles-atomic-openshift-node\ atomic-openshift-excluder \ atomic-openshift-docker-excluder
If you use a separate etcd cluster, also remove the etcd package:
# yum remove etcd
If using the embedded etcd, leave the etcd package installed. It is required for running the
etcdctl
command to issue operations in later steps.
6.5. Downgrading Docker
OpenShift Container Platform 3.2 requires Docker 1.9.1 and also supports Docker 1.10.3.
Downgrade to Docker 1.9.1 on each host using the following steps:
Remove all local containers and images on the host. Any pods backed by a replication controller will be recreated.
WarningThe following commands are destructive and should be used with caution.
Delete all containers:
# docker rm $(docker ps -a -q)
Delete all images:
# docker rmi $(docker images -q)
Use
yum swap
(instead ofyum downgrade
) to install Docker 1.9.1:# yum swap docker-* docker-*1.9.1 # sed -i 's/--storage-opt dm.use_deferred_deletion=true//' /etc/sysconfig/docker-storage # systemctl restart docker
You should now have Docker 1.9.1 installed and running on the host. Verify with the following:
# docker version Client: Version: 1.9.1-el7 API version: 1.20 Package Version: docker-1.9.1-10.el7.x86_64 [...] # systemctl status docker ● docker.service - Docker Application Container Engine Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled) Active: active (running) since Wed 2017-06-21 15:44:20 EDT; 30min ago [...]
6.6. Reinstalling RPMs
Disable the OpenShift Container Platform 3.3 repositories, and re-enable the 3.2 repositories:
# subscription-manager repos \ --disable=rhel-7-server-ose-3.3-rpms \ --enable=rhel-7-server-ose-3.2-rpms
On each master, install the following packages:
# yum install atomic-openshift \ atomic-openshift-clients \ atomic-openshift-node \ atomic-openshift-master \ openvswitch \ atomic-openshift-sdn-ovs \ tuned-profiles-atomic-openshift-node \ atomic-openshift-excluder \ atomic-openshift-docker-excluder
On each node, install the following packages:
# yum install atomic-openshift \ atomic-openshift-node \ openvswitch \ atomic-openshift-sdn-ovs \ tuned-profiles-atomic-openshift-node \ atomic-openshift-excluder \ atomic-openshift-docker-excluder
If you use a separate etcd cluster, install the following package on each etcd member:
# yum install etcd
6.7. Bringing OpenShift Container Platform Services Back Online
See Backup and Restore.
6.8. Verifying the Downgrade
To verify the downgrade, first check that all nodes are marked as Ready:
# oc get nodes NAME STATUS AGE master.example.com Ready,SchedulingDisabled 165d node1.example.com Ready 165d node2.example.com Ready 165d
Then, verify that you are running the expected versions of the docker-registry and router images, if deployed:
# oc get -n default dc/docker-registry -o json | grep \"image\" "image": "openshift3/ose-docker-registry:v3.2.1.34-5", # oc get -n default dc/router -o json | grep \"image\" "image": "openshift3/ose-haproxy-router:v3.2.1.34-5",
You can use the diagnostics tool on the master to look for common issues and provide suggestions:
# oc adm diagnostics ... [Note] Summary of diagnostics execution: [Note] Completed with no errors or warnings seen.
Chapter 7. Master and Node Configuration
7.1. Overview
The openshift start
command is used to launch OpenShift Container Platform servers. The command and its subcommands (master
to launch a master server and node
to launch a node server) all take a limited set of arguments that are sufficient for launching servers in a development or experimental environment.
However, these arguments are insufficient to describe and control the full set of configuration and security options that are necessary in a production environment. To provide those options, it is necessary to use the dedicated master and node configuration files.
Master configuration files and node configuration files are fully specified with no default values. Therefore, any empty value indicates that you want to start up with an empty value for that parameter. This makes it easy to reason about exactly what your configuration is, but it also makes it difficult to remember all of the options to specify. To make this easier, the configuration files can be created with the --write-config
option and then used with the --config
option.
7.2. Master Configuration Files
This section reviews parameters mentioned in the master-config.yaml file.
You can create a new master configuration file to see the valid options for your installed version of OpenShift Container Platform.
7.2.1. Admission Control Configuration
Parameter Name | Description |
---|---|
| Contains admission control plug-in configuration. |
|
Key-value pairs that will be passed directly to the Kube API server that match the API servers' command line arguments. These are not migrated, but if you reference a value that does not exist the server will not start. These values may override other settings in |
|
Key-value pairs that will be passed directly to the Kube controller manager that match the controller manager’s command line arguments. These are not migrated, but if you reference a value that does not exist the server will not start. These values may override other settings in |
|
Used to enable or disable various admission plug-ins. When this type is present as the configuration object under |
| Allows specifying a configuration file per admission control plug-in. |
| A list of admission control plug-in names that will be installed on the master. Order is significant. If empty, a default list of plug-ins is used. |
|
Key-value pairs that will be passed directly to the Kube scheduler that match the scheduler’s command line arguments. These are not migrated, but if you reference a value that does not exist the server will not start. These values may override other settings in |
7.2.2. Asset Configuration
Parameter Name | Description |
---|---|
| Holds the necessary configuration options for serving assets. |
| A list of features that should not be started. You will likely want to set this as null. It is very unlikely that anyone will want to manually disable features and that is not encouraged. |
| Files to serve from the asset server file system under a subcontext. |
| When set to true, tells the asset server to reload extension scripts and stylesheets for every request rather than only at startup. It lets you develop extensions without having to restart the server for every change. |
|
Key- (string) and value- (string) pairs that will be injected into the console under the global variable |
| File paths on the asset server files to load as scripts when the web console loads. |
| File paths on the asset server files to load as style sheets when the web console loads. |
| The public endpoint for logging (optional). |
| An optional, absolute URL to redirect web browsers to after logging out of the web console. If not specified, the built-in logout page is shown. |
| How the web console can access the OpenShift Container Platform server. |
| The public endpoint for metrics (optional). |
| URL of the the asset server. |
7.2.3. Authentication and Authorization Configuration
Parameter Name | Description |
---|---|
| Holds authentication and authorization configuration options. |
| Indicates how many authentication results should be cached. If 0, the default cache size is used. |
| Indicates how long an authorization result should be cached. It takes a valid time duration string (e.g. "5m"). If empty, you get the default timeout. If zero (e.g. "0m"), caching is disabled. |
7.2.4. Controller Configuration
Parameter Name | Description |
---|---|
|
List of the controllers that should be started. If set to none, no controllers will start automatically. The default value is * which will start all controllers. When using *, you may exclude controllers by prepending a |
|
Enables controller election, instructing the master to attempt to acquire a lease before controllers start and renewing it within a number of seconds defined by this value. Setting this value non-negative forces |
| Instructs the master to not automatically start controllers, but instead to wait until a notification to the server is received before launching them. |
7.2.5. etcd Configuration
Parameter Name | Description |
---|---|
| The advertised host:port for client connections to etcd. |
| Contains information about how to connect to etcd. |
| Holds the necessary configuration options for connecting with an etcd database. |
| Contains information about how API resources are stored in etcd. These values are only relevant when etcd is the backing store for the cluster. |
| The path within etcd that the Kubernetes resources will be rooted under. This value, if changed, will mean existing objects in etcd will no longer be located. The default value is kubernetes.io. |
| The API version that Kubernetes resources in etcd should be serialized to. This value should not be advanced until all clients in the cluster that read from etcd have code that allows them to read the new version. |
| The path within etcd that the OpenShift Container Platform resources will be rooted under. This value, if changed, will mean existing objects in etcd will no longer be located. The default value is openshift.io. |
| API version that OS resources in etcd should be serialized to. This value should not be advanced until all clients in the cluster that read from etcd have code that allows them to read the new version. |
| The advertised host:port for peer connections to etcd. |
| Describes how to start serving the etcd peer. |
| Describes how to start serving the etcd master. |
| The path to the etcd storage directory. |
7.2.6. Grant Configuration
Parameter Name | Description |
---|---|
| Describes how to handle grants. |
| Auto-approves client authorization grant requests. |
| Auto-denies client authorization grant requests. |
| Prompts the user to approve new client authorization grant requests. |
| Determines the default strategy to use when an OAuth client requests a grant.This method will be used only if the specific OAuth client does not provide a strategy of their own. Valid grant handling methods are:
|
7.2.7. Image Configuration
Parameter Name | Description |
---|---|
| Allows scheduled background import of images to be disabled. |
| The format of the name to be built for the system component. |
| Holds options that describe how to build image names for system components. |
| Controls limits and behavior for importing images. |
| Determines if the latest tag will be pulled from the registry. |
| Controls the number of images that are imported when a user does a bulk import of a Docker repository. This number defaults to 5 to prevent users from importing large numbers of images accidentally. Set -1 for no limit. |
| The maximum number of scheduled image streams that will be imported in the background per minute. The default value is 60. |
| The minimum number of seconds that can elapse between when image streams scheduled for background import are checked against the upstream repository. The default value is 15 minutes. |
7.2.8. Kubernetes Master Configuration
Parameter Name | Description |
---|---|
| A list of API levels that should be enabled on startup, v1 as examples. |
|
A map of groups to the versions (or |
| Contains information about how to connect to kubelets. |
| Holds the necessary configuration options for the Kubernetes master. |
| The number of expected masters that should be running. This value defaults to 1 and may be set to a positive integer, or if set to -1, indicates this is part of a cluster. |
|
The public IP address of Kubernetes resources. If empty, the first result from |
| File name for the .kubeconfig file that describes how to connect this node to the master. |
| The range to use for assigning service public ports on a host. |
| The subnet to use for assigning service IPs. |
| The list of nodes that are statically known. |
7.2.9. Network Configuration
Parameter Name | Description |
---|---|
| The CIDR string to specify the global overlay network’s L3 space. |
|
Controls what values are acceptable for the service external IP field. If empty, no |
| The number of bits to allocate to each host’s subnet. For example, 8 would mean a /24 network on the host. |
| Controls the range to assign ingress IPs from for services of type LoadBalancer on bare metal. If empty, ingress IPs will not be assigned. It may contain a single CIDR that will be allocated from. For security reasons, you should ensure that this range does not overlap with the CIDRs reserved for external IPs, nodes, pods, or services. |
| Provides network options for the node. |
| The name of the network plug-in to use. |
| The CIDR string to specify the service networks. |
7.2.10. OAuth Authentication Configuration
Parameter Name | Description |
---|---|
| Forces the provider selection page to render even when there is only a single provider. |
| Used for building valid client redirect URLs for external access. |
| A path to a file containing a go template used to render error pages during the authentication or grant flow If unspecified, the default error page is used. |
| Ordered list of ways for a user to identify themselves. |
| A path to a file containing a go template used to render the login page. If unspecified, the default login page is used. |
|
CA for verifying the TLS connection back to the |
| Used for building valid client redirect URLs for external access. |
| Used for making server-to-server calls to exchange authorization codes for access tokens. |
| Holds the necessary configuration options for OAuth authentication. |
| Allows for customization of pages like the login page. |
| A path to a file containing a go template used to render the provider selection page. If unspecified, the default provider selection page is used. |
| Holds information about configuring sessions. |
| Allows you to customize pages like the login page. |
| Contains options for authorization and access tokens. |
7.2.11. Project Configuration
Parameter Name | Description |
---|---|
| Holds default project node label selector. |
| Holds information about project creation and defaults. |
| The string presented to a user if they are unable to request a project via the project request API endpoint. |
| The template to use for creating projects in response to projectrequest. It is in the format namespace/template and it is optional. If it is not specified, a default template is used. |
7.2.12. Scheduler Configuration
Parameter Name | Description |
---|---|
| Points to a file that describes how to set up the scheduler. If empty, you get the default scheduling rules |
7.2.13. Security Allocator Configuration
Parameter Name | Description |
---|---|
|
Defines the range of MCS categories that will be assigned to namespaces. The format is |
| Controls the automatic allocation of UIDs and MCS labels to a project. If nil, allocation is disabled. |
| Defines the total set of Unix user IDs (UIDs) that will be allocated to projects automatically, and the size of the block each namespace gets. For example, 1000-1999/10 will allocate ten UIDs per namespace, and will be able to allocate up to 100 blocks before running out of space. The default is to allocate from 1 billion to 2 billion in 10k blocks (which is the expected size of the ranges container images will use once user namespaces are started). |
7.2.14. Service Account Configuration
Parameter Name | Description |
---|---|
| Controls whether or not to allow a service account to reference any secret in a namespace without explicitly referencing them. |
|
A list of service account names that will be auto-created in every namespace. If no names are specified, the |
| The CA for verifying the TLS connection back to the master. The service account controller will automatically inject the contents of this file into pods so they can verify connections to the master. |
|
A file containing a PEM-encoded private RSA key, used to sign service account tokens. If no private key is specified, the service account |
| A list of files, each containing a PEM-encoded public RSA key. If any file contains a private key, the public portion of the key is used. The list of public keys is used to verify presented service account tokens. Each key is tried in order until the list is exhausted or verification succeeds. If no keys are specified, no service account authentication will be available. |
| Holds the necessary configuration options for a service account. |
7.2.15. Serving Information Configuration
Parameter Name | Description |
---|---|
| Allows the DNS server on the master to answer queries recursively. Note that open resolvers can be used for DNS amplification attacks and the master DNS should not be made accessible to public networks. |
| The ip:port to serve on. |
| Controls limits and behavior for importing images. |
| A file containing a PEM-encoded certificate. |
| TLS cert information for serving secure traffic. |
| The certificate bundle for all the signers that you recognize for incoming client certificates. |
| Holds the necessary configuration options for DNS. |
| Holds the domain suffix. |
| Holds the IP. |
|
A file containing a PEM-encoded private key for the certificate specified by |
| Provides overrides to the client connection used to connect to the master. |
| The number of concurrent requests allowed to the server. If zero, no limit. |
| A list of certificates to use to secure requests to specific host names. |
| The number of seconds before requests are timed out. The default is 60 minutes. If -1, there is no limit on requests. |
| The HTTP serving information for the assets. |
7.2.16. Volume Configuration
Parameter Name | Description |
---|---|
| A boolean to enable or disable dynamic provisioning. Default is true. |
FSGroup |
Can be specified to enable a quota on local storage use per unique FSGroup ID. At present this is only implemented for emptyDir volumes, and if the underlying |
| Contains options for controlling local volume quota on the node. |
| Contains options for configuring volume plug-ins in the master node. |
| Contains options for configuring volumes on the node. |
| Contains options for configuring volumes on the node. |
| The directory that volumes are stored under. |
7.2.17. Audit Configuration
Audit provides a security-relevant chronological set of records documenting the sequence of activities that have affected system by individual users, administrators, or other components of the system.
Audit works at the API server level, logging all requests coming to the server. Each audit log contains two entries:
The request line containing:
- A Unique ID allowing to match the response line (see #2)
- The source IP of the request
- The HTTP method being invoked
- The original user invoking the operation
- The impersonated user for the operation
- The namespace of the request or <none>
- The URI as requested
The response line containing:
- The the unique ID from #1
- The response code
Example output for user admin asking for a list of pods:
AUDIT: id="5c3b8227-4af9-4322-8a71-542231c3887b" ip="127.0.0.1" method="GET" user="admin" as="<self>" namespace="default" uri="/api/v1/namespaces/default/pods" AUDIT: id="5c3b8227-4af9-4322-8a71-542231c3887b" response="200"
The openshift_master_audit_config
variable enables API service auditing. It takes an array of the following options:
Parameter Name | Description |
---|---|
|
A boolean to enable or disable audit logs. Default is |
| File path where the requests should be logged to. If not set, logs are printed to master logs. |
| Specifies maximum number of days to retain old audit log files based on the time stamp encoded in their filename. |
| Specifies the maximum number of old audit log files to retain. |
| Specifies maximum size in megabytes of the log file before it gets rotated. Defaults to 100MB. |
Example Audit Configuration
auditConfig: auditFilePath: "/var/log/audit-ocp.log" enabled: true maximumFileRetentionDays: 10 maximumFileSizeMegabytes: 10 maximumRetainedFiles: 10
7.3. Node Configuration Files
The following node-config.yaml file is a sample node configuration file that was generated with the default values as of writing. You can create a new node configuration file to see the valid options for your installed version of OpenShift Container Platform.
Example 7.1. Sample Node Configuration File
allowDisabledDocker: false apiVersion: v1 authConfig: authenticationCacheSize: 1000 authenticationCacheTTL: 5m authorizationCacheSize: 1000 authorizationCacheTTL: 5m dnsDomain: cluster.local dnsIP: 10.0.2.15 1 dockerConfig: execHandlerName: native imageConfig: format: openshift/origin-${component}:${version} latest: false iptablesSyncPeriod: 5s kind: NodeConfig masterKubeConfig: node.kubeconfig networkConfig: mtu: 1450 networkPluginName: "" nodeIP: "" nodeName: node1.example.com podManifestConfig: 2 path: "/path/to/pod-manifest-file" 3 fileCheckIntervalSeconds: 30 4 proxyArguments: proxy-mode: - iptables 5 volumeConfig: localQuota: perFSGroup: null6 servingInfo: bindAddress: 0.0.0.0:10250 bindNetwork: tcp4 certFile: server.crt clientCA: node-client-ca.crt keyFile: server.key namedCertificates: null volumeDirectory: /root/openshift.local.volumes
- 1
- Configures an IP address to be prepended to a pod’s /etc/resolv.conf by adding the address here.
- 2
- Allows pods to be placed directly on certain set of nodes, or on all nodes without going through the scheduler. You can then use pods to perform the same administrative tasks and support the same services on each node.
- 3
- Specifies the path for the pod manifest file or directory. If it is a directory, then it is expected to contain one or more manifest files. This is used by the Kubelet to create pods on the node.
- 4
- This is the interval (in seconds) for checking the manifest file for new data. The interval must be a positive value.
- 5
- The service proxy implementation to use.
- 6
- Preliminary support for local emptyDir volume quotas, set this value to a resource quantity representing the desired quota per FSGroup, per node. (i.e. 1Gi, 512Mi, etc) Currently requires that the volumeDirectory be on an XFS filesystem mounted with the 'gquota' option, and the matching security context contraint’s fsGroup type set to 'MustRunAs'.
7.3.1. Pod and Node Configuration
Parameter Name | Description |
---|---|
| The fully specified configuration starting an OpenShift Container Platform node. |
| Node may have multiple IPs, so this specifies the IP to use for pod traffic routing. If not specified, network parse/lookup on the nodeName is performed and the first non-loopback address is used. |
| The value used to identify this particular node in the cluster. If possible, this should be your fully qualified hostname. If you are describing a set of static nodes to the master, this value must match one of the values in the list. |
| Controls grace period for deleting pods on failed nodes. It takes valid time duration string. If empty, you get the default pod eviction timeout. |
| Specifies the client cert/key to use when proxying to pods. |
7.3.2. Docker Configuration
Parameter Name | Description |
---|---|
| If true, the kubelet will ignore errors from Docker. This means that a node can start on a machine that does not have docker started. |
| Holds Docker related configuration options |
| The handler to use for executing commands in Docker containers. |
7.3.3. Parallel Image Pulls with Docker 1.9+
If you are using Docker 1.9+, you may want to consider enabling parallel image pulling, as the default is to pull images one at a time.
There is a potential issue with data corruption prior to Docker 1.9. However, starting with 1.9, the corruption issue is resolved and it is safe to switch to parallel pulls.
kubeletArguments:
serialize-image-pulls:
- "false" 1
- 1
- Change to true to disable parallel pulls. (This is the default config)
7.4. Passwords and Other Sensitive Data
For some authentication configurations, an LDAP bindPassword
or OAuth clientSecret
value is required. Instead of specifying these values directly in the master configuration file, these values may be provided as environment variables, external files, or in encrypted files.
Environment Variable Example
... bindPassword: env: BIND_PASSWORD_ENV_VAR_NAME
External File Example
... bindPassword: file: bindPassword.txt
Encrypted External File Example
... bindPassword: file: bindPassword.encrypted keyFile: bindPassword.key
To create the encrypted file and key file for the above example:
$ oadm ca encrypt --genkey=bindPassword.key --out=bindPassword.encrypted > Data to encrypt: B1ndPass0rd!
Encrypted data is only as secure as the decrypting key. Care should be taken to limit filesystem permissions and access to the key file.
7.5. Creating New Configuration Files
When defining an OpenShift Container Platform configuration from scratch, start by creating new configuration files.
For master host configuration files, use the openshift start
command with the --write-config
option to write the configuration files. For node hosts, use the oadm create-node-config
command to write the configuration files.
The following commands write the relevant launch configuration file(s), certificate files, and any other necessary files to the specified --write-config
or --node-dir
directory.
To create configuration files for an all-in-one server (a master and a node on the same host) in the specified directory:
$ openshift start --write-config=/openshift.local.config
To create a master configuration file and other required files in the specified directory:
$ openshift start master --write-config=/openshift.local.config/master
To create a node configuration file and other related files in the specified directory:
$ oadm create-node-config \ --node-dir=/openshift.local.config/node-<node_hostname> \ --node=<node_hostname> \ --hostnames=<node_hostname>,<ip_address> \ --certificate-authority="/path/to/ca.crt" \ --signer-cert="/path/to/ca.crt" \ --signer-key="/path/to/ca.key" --signer-serial="/path/to/ca.serial.txt" --node-client-certificate-authority="/path/to/ca.crt"
When creating node configuration files, the --hostnames
option accepts a comma-delimited list of every host name or IP address you want server certificates to be valid for.
7.6. Launching Servers Using Configuration Files
Once you have modified the master and/or node configuration files to your specifications, you can use them when launching servers by specifying them as an argument. Keep in mind that if you specify a configuration file, none of the other command line options you pass are respected.
To launch an all-in-one server using a master configuration and a node configuration file:
$ openshift start --master-config=/openshift.local.config/master/master-config.yaml --node-config=/openshift.local.config/node-<node_hostname>/node-config.yaml
To launch a master server using a master configuration file:
$ openshift start master --config=/openshift.local.config/master/master-config.yaml
To launch a node server using a node configuration file:
$ openshift start node --config=/openshift.local.config/node-<node_hostname>/node-config.yaml
7.7. Configuring Logging Levels
OpenShift Container Platform uses the systemd-journald.service
to collect log messages for debugging, using five log message severities. The logging levels are based on Kubernetes logging conventions, as follows:
Option | Description |
---|---|
0 | Errors and warnings only |
2 | Normal information |
4 | Debugging-level information |
6 | API-level debugging information (request / response) |
8 | Body-level API debugging information |
You can control which INFO messages are logged by setting the loglevel option in the in /etc/sysconfig/atomic-openshift-node or /etc/sysconfig/atomic-openshift-master file. Configuring the logs to collect all messages can lead to large logs that are difficult to interpret and can take up excessive space. Collecting all messages should only be used in debug situations.
Messages with FATAL, ERROR, WARNING and some INFO severities appear in the logs regardless of the log configuration.
You can view logs for the master or the node system using the following command:
# journalctl -r -u <journal_name>
Use the -r
option to show the newest entries first.
For example:
# journalctl -r -u atomic-openshift-master.service # journalctl -r -u atomic-openshift-node.service
To change the logging level:
- Edit the /etc/sysconfig/atomic-openshift-master file for the master or /etc/sysconfig/atomic-openshift-node file for the nodes.
Enter a value from the Log Level Options table above in the
OPTIONS=--loglevel=
field.For example:
OPTIONS=--loglevel=4
- Restart the master or node host as appropriate:
# systemctl restart atomic-openshift-master # systemctl restart atomic-openshift-node
After the restart, all new log messages will conform to the new setting. Older messages do not change.
The default log level can be set using the Advanced Install. For more information, see Cluster Variables.
The following examples are excerpts from a master journald log at various log levels. Timestamps and system information have been removed from these examples.
Excerpt of journalctl -u atomic-openshift-master.service output at loglevel=0
fit failure on node: PodFitsHostPorts E0222 factory.go:361] Error scheduling default router-1 I0222 event.go:211] Event(api.ObjectReference I0222 start_master.go:644] Started Origin Controllers I0222 start_master.go:623] Started Kubernetes Controllers I0222 endpoints_controller.go:283] Waiting for pods controller I0222 event.go:211] Event(api.ObjectReference{Kind:"Node" W0222 nodecontroller.go:671] Missing timestamp for Node W0222 nodecontroller.go:671] Missing timestamp for Node
Excerpt of journalctl -u atomic-openshift-master.service output at loglevel=2
E0222 factory.go:361] Error scheduling default router-1 Always TerminationGracePeriodSeconds:0xc20d819b78 ActiveDeadlineSeconds:<nil> I0222 scheduler.go:117] Failed to schedule: &{TypeMeta: I0222 event.go:211] Event(api.ObjectReference{Kind: I0222 replication_controller.go:434] Too few "default"/"router" I0222 start_master.go:644] Started Origin Controllers I0222 subnets.go:27] Found existing HostSubnet I0222 subnets.go:27] Found existing HostSubnet I0222 common.go:79] Initializing single-tenant plugin I0222 common.go:54] Starting with configured hostname I0222 start_master.go:623] Started Kubernetes Controllers I0222 plugins.go:291] Loaded volume plugin "kubernetes.io/nf" I0222 plugins.go:291] Loaded volume plugin "kubernetes.io/ho" I0222 endpoints_controller.go:283] Waiting for pods controller" I0222 endpoints_controller.go:283] Waiting for pods controller" W0222 nodecontroller.go:671] Missing timestamp for Node I0222 nodecontroller.go:604] Recording Registered Node I0222 nodecontroller.go:416] NodeController observed
Excerpt of journalctl -u atomic-openshift-master.service output at loglevel=4
controller_utils.go:592] Ignoring inactive pod default/router-1-0ww1g in state Failed, deletion time <nil> I0222 replication_controller.go:497] Finished syncing controller "default/docker-registry-2" (206.507µs) I0222 controller_utils.go:592] Ignoring inactive pod default/router-1-zyi9y in state Failed, deletion time <nil> I0222 replication_controller.go:497] Finished syncing controller "default/docker-registry-1" (176.748µs) I0222 controller_utils.go:160] Controller default/router-1 either never recorded expectations, or the ttl expired. I0222 controller_utils.go:160] Controller default/docker-registry-2 either never recorded expectations, or the ttl expired. I0222 nodecontroller.go:709] Node dell-r430-20.gsslab.pnq.redhat.com ReadyCondition updated. Updating timestamp. I0222 factory.go:474] Backing off 1m0s for pod &{backoff:60000000000 lastUpdate:{sec:636233 loc:0x59a6560} reqInFlight:1} ; retrying fit failure on node (ibm-x3650m4-01-vm-02.lab.eng.bos.redhat.com): PodFitsHostPorts E0222 factory.go:361] Error scheduling default router-1-d7svd: pod (router-1-d7svd) failed to fit in any node b089d8 ActiveDeadlineSeconds:<nil> DNSPolicy:ClusterFirst NodeSelector:map[region:infra] ServiceAccountName:router NodeName: SecurityContext:0xc20ecd00c0 ImagePullSec ]} Spec:{Volumes:[{Name:router-token-h6q3n VolumeSource:{HostPath:<nil> EmptyDir:<nil> GCEPersistentDisk:<nil> AWSElasticBlockStore:<nil> GitRepo:<nil> Secret:0xc20eb I0222 factory.go:474] Backing off 16s for pod &{backoff:32000000000 lastUpdate:{sec:63623353879 nsec:506358920 loc:0x59a6560} reqInFlight:1} b118b8 ActiveDeadlineSeconds:<nil> DNSPolicy:ClusterFirst NodeSelector:map[region:infra] ServiceAccountName:router NodeName:
Excerpt of journalctl -u atomic-openshift-master.service output at loglevel=8
I0222 round_trippers.go:271] Request Headers: I0222 round_trippers.go:264] GET https://dell-r430-20.gsslab I0222 round_trippers.go:274] User-Agent: openshift/v3.2. I0222 round_trippers.go:274] Accept: application/json, * I0222 round_trippers.go:271] Request Headers: I0222 round_trippers.go:264] GET https://dell-r430-20.gsslab I0222 request.go:870] Response Body: {"kind":"ClusterRole"," I0222 round_trippers.go:295] Content-Type: application/j I0222 round_trippers.go:295] Cache-Control: no-store I0222 round_trippers.go:295] Content-Length: 898 I0222 round_trippers.go:295] Date: Wed, 22 Feb 2017 09:3 I0222 round_trippers.go:292] Response Headers: I0222 round_trippers.go:289] Response Status: 200 OK in 7 mi I0222 configgetter.go:127] using watch cache storage (capacity=1000) I0222 controller_utils.go:592] Ignoring inactive pod
Chapter 8. Adding Hosts to an Existing Cluster
8.1. Overview
Depending on how your OpenShift Container Platform cluster was installed, you can add new hosts (either nodes or masters) to your installation by using the install tool for quick installations, or by using the scaleup.yml playbook for advanced installations.
8.2. Adding Hosts Using the Quick Installer Tool
If you used the quick install tool to install your OpenShift Container Platform cluster, you can use the quick install tool to add a new node host to your existing cluster, or to reinstall the cluster entirely.
Currently, you can not use the quick installer tool to add new master hosts. You must use the advanced installation method to do so.
If you used the installer in either interactive or unattended mode, you can re-run the installation as long as you have an installation configuration file at ~/.config/openshift/installer.cfg.yml (or specify a different location with the -c
option).
The recommended maximum number of nodes is 1000.
To add nodes to your installation:
Re-run the installer with the
install
subcommand in interactive or unattended mode:$ atomic-openshift-installer [-u] [-c </path/to/file>] install
The installer detects your current environment and allows you to either add an additional node or re-perform a clean install:
Gathering information from hosts... Installed environment detected. By default the installer only adds new nodes to an installed environment. Do you want to (1) only add additional nodes or (2) perform a clean install?:
Choose (1) and follow the on-screen instructions to complete your desired task.
8.3. Adding Hosts Using the Advanced Install
If you installed using the advanced install, you can add new hosts to your cluster by running the scaleup.yml playbook. This playbook queries the master, generates and distributes new certificates for the new hosts, then runs the configuration playbooks on the new hosts only. Before running the scaleup.yml playbook, complete all prerequisite host preparation steps.
This process is similar to re-running the installer in the quick installation method to add nodes, however you have more configuration options available when using the advanced method and when running the playbooks directly.
You must have an existing inventory file (for example, /etc/ansible/hosts) that is representative of your current cluster configuration in order to run the scaleup.yml playbook. If you previously used the atomic-openshift-installer
command to run your installation, you can check ~/.config/openshift/hosts (previously located at ~/.config/openshift/.ansible/hosts) for the last inventory file that the installer generated, and use or modify that as needed as your inventory file. You must then specify the file location with -i
when calling ansible-playbook
later.
The recommended maximum number of nodes is 1000.
To add a host to an existing cluster:
Ensure you have the latest playbooks by updating the atomic-openshift-utils package:
# yum update atomic-openshift-utils
Edit your /etc/ansible/hosts file and add new_<host_type> to the [OSEv3:children] section:
For example, to add a new node host, add new_nodes:
[OSEv3:children] masters nodes new_nodes
To add new master hosts, add new_masters.
Create a [new_<host_type>] section much like an existing section, specifying host information for any new hosts you want to add. For example, when adding a new node:
[nodes] master[1:3].example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" [new_nodes] node3.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}"
See Configuring Host Variables for more options.
When adding new masters, hosts added to the [new_masters] section must also be added to the [new_nodes] section. This ensures the new master host is part of the OpenShift SDN.
[masters] master[1:2].example.com [new_masters] master3.example.com [nodes] master[1:2].example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" [new_nodes] master3.example.com
Masters are also automatically marked as unschedulable for pod placement by the installer.
ImportantIf you label a master host with the
region=infra
label and have no other dedicated infrastructure nodes, you must also explicitly mark the host as schedulable by addingopenshift_schedulable=true
to the entry. Otherwise, the registry and router pods cannot be placed anywhere.Run the scaleup.yml playbook. If your inventory file is located somewhere other than the default of /etc/ansible/hosts, specify the location with the
-i option
.For additional nodes:
# ansible-playbook [-i /path/to/file] \ /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-node/scaleup.yml
For additional masters:
# ansible-playbook [-i /path/to/file] \ /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-master/scaleup.yml
- After the playbook completes successfully, verify the installation.
Finally, move any hosts you had defined in the [new_<host_type>] section into their appropriate section (but leave the [new_<host_type>] section definition itself in place) so that subsequent runs using this inventory file are aware of the nodes but do not handle them as new nodes. For example, when adding new nodes:
[nodes] master[1:3].example.com node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}" node2.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" node3.example.com openshift_node_labels="{'region': 'primary', 'zone': 'west'}" infra-node1.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" infra-node2.example.com openshift_node_labels="{'region': 'infra', 'zone': 'default'}" [new_nodes]
Chapter 9. Loading the Default Image Streams and Templates
9.1. Overview
Your OpenShift Container Platform installation includes useful sets of Red Hat-provided image streams and templates to make it easy for developers to create new applications. By default, the quick and advanced installation methods automatically create these sets in the openshift project, which is a default global project to which all users have view access.
9.2. Offerings by Subscription Type
Depending on the active subscriptions on your Red Hat account, the following sets of image streams and templates are provided and supported by Red Hat. Contact your Red Hat sales representative for further subscription details.
9.2.1. OpenShift Container Platform Subscription
The core set of image streams and templates are provided and supported with an active OpenShift Container Platform subscription. This includes the following technologies:
Type | Technology |
---|---|
Languages & Frameworks | |
Databases | |
Middleware Services | |
Other Services |
9.2.2. xPaaS Middleware Add-on Subscriptions
Support for xPaaS middleware images are provided by xPaaS Middleware add-on subscriptions, which are separate subscriptions for each xPaaS product. If the relevant subscription is active on your account, image streams and templates are provided and supported for the following technologies:
Type | Technology |
---|---|
Middleware Services |