Chapter 9. Installing a cluster on IBM Cloud in a restricted network
In OpenShift Container Platform 4.15, you can install a cluster in a restricted network by creating an internal mirror of the installation release content that is accessible to an existing Virtual Private Cloud (VPC) on IBM Cloud®.
9.1. Prerequisites
- You reviewed details about the OpenShift Container Platform installation and update processes.
- You configured an IBM Cloud account to host the cluster.
- You have a container image registry that is accessible to the internet and your restricted network. The container image registry should mirror the contents of the OpenShift image registry and contain the installation media. For more information, see Mirroring images for a disconnected installation using the oc-mirror plugin.
You have an existing VPC on IBM Cloud® that meets the following requirements:
- The VPC contains the mirror registry or has firewall rules or a peering connection to access the mirror registry that is hosted elsewhere.
- The VPC can access IBM Cloud® service endpoints using a public endpoint. If network restrictions limit access to public service endpoints, evaluate those services for alternate endpoints that might be available. For more information see Access to IBM service endpoints.
You cannot use the VPC that the installation program provisions by default.
If you plan on configuring endpoint gateways to use IBM Cloud® Virtual Private Endpoints, consider the following requirements:
-
Endpoint gateway support is currently limited to the
us-east
andus-south
regions. - The VPC must allow traffic to and from the endpoint gateways. You can use the VPC’s default security group, or a new security group, to allow traffic on port 443. For more information, see Allowing endpoint gateway traffic.
-
Endpoint gateway support is currently limited to the
- If you use a firewall, you configured it to allow the sites that your cluster requires access to.
-
You configured the
ccoctl
utility before you installed the cluster. For more information, see Configuring IAM for IBM Cloud VPC.
9.2. About installations in restricted networks
In OpenShift Container Platform 4.15, you can perform an installation that does not require an active connection to the internet to obtain software components. Restricted network installations can be completed using installer-provisioned infrastructure or user-provisioned infrastructure, depending on the cloud platform to which you are installing the cluster.
9.2.1. Required internet access and an installation host
You complete the installation using a bastion host or portable device that can access both the internet and your closed network. You must use a host with internet access to:
-
Download the installation program, the OpenShift CLI (
oc
), and the CCO utility (ccoctl
). - Use the installation program to locate the Red Hat Enterprise Linux CoreOS (RHCOS) image and create the installation configuration file.
-
Use
oc
to extractccoctl
from the CCO container image. -
Use
oc
andccoctl
to configure IAM for IBM Cloud®.
9.2.2. Access to a mirror registry
To complete a restricted network installation, you must create a registry that mirrors the contents of the OpenShift image registry and contains the installation media.
You can create this registry on a mirror host, which can access both the internet and your restricted network, or by using other methods that meet your organization’s security restrictions.
For more information on mirroring images for a disconnected installation, see "Additional resources".
9.2.3. Access to IBM service endpoints
The installation program requires access to the following IBM Cloud® service endpoints:
- Cloud Object Storage
- DNS Services
- Global Search
- Global Tagging
- Identity Services
- Resource Controller
- Resource Manager
- VPC
If you are specifying an IBM® Key Protect for IBM Cloud® root key as part of the installation process, the service endpoint for Key Protect is also required.
By default, the public endpoint is used to access the service. If network restrictions limit access to public service endpoints, you can override the default behavior.
Before deploying the cluster, you can update the installation configuration file (install-config.yaml
) to specify the URI of an alternate service endpoint. For more information on usage, see "Additional resources".
9.2.4. Additional limits
Clusters in restricted networks have the following additional limitations and restrictions:
-
The
ClusterVersion
status includes anUnable to retrieve available updates
error. - By default, you cannot use the contents of the Developer Catalog because you cannot access the required image stream tags.
9.3. About using a custom VPC
In OpenShift Container Platform 4.15, you can deploy a cluster into the subnets of an existing IBM® Virtual Private Cloud (VPC). Deploying OpenShift Container Platform into an existing VPC can help you avoid limit constraints in new accounts or more easily abide by the operational constraints that your company’s guidelines set. If you cannot obtain the infrastructure creation permissions that are required to create the VPC yourself, use this installation option.
Because the installation program cannot know what other components are in your existing subnets, it cannot choose subnet CIDRs and so forth. You must configure networking for the subnets to which you will install the cluster.
9.3.1. Requirements for using your VPC
You must correctly configure the existing VPC and its subnets before you install the cluster. The installation program does not create the following components:
- NAT gateways
- Subnets
- Route tables
- VPC network
The installation program cannot:
- Subdivide network ranges for the cluster to use
- Set route tables for the subnets
- Set VPC options like DHCP
The installation program requires that you use the cloud-provided DNS server. Using a custom DNS server is not supported and causes the installation to fail.
9.3.2. VPC validation
The VPC and all of the subnets must be in an existing resource group. The cluster is deployed to the existing VPC.
As part of the installation, specify the following in the install-config.yaml
file:
-
The name of the existing resource group that contains the VPC and subnets (
networkResourceGroupName
) -
The name of the existing VPC (
vpcName
) -
The subnets that were created for control plane machines and compute machines (
controlPlaneSubnets
andcomputeSubnets
)
Additional installer-provisioned cluster resources are deployed to a separate resource group (resourceGroupName
). You can specify this resource group before installing the cluster. If undefined, a new resource group is created for the cluster.
To ensure that the subnets that you provide are suitable, the installation program confirms the following:
- All of the subnets that you specify exist.
For each availability zone in the region, you specify:
- One subnet for control plane machines.
- One subnet for compute machines.
- The machine CIDR that you specified contains the subnets for the compute machines and control plane machines.
Subnet IDs are not supported.
9.3.3. Isolation between clusters
If you deploy OpenShift Container Platform to an existing network, the isolation of cluster services is reduced in the following ways:
- You can install multiple OpenShift Container Platform clusters in the same VPC.
- ICMP ingress is allowed to the entire network.
- TCP port 22 ingress (SSH) is allowed to the entire network.
- Control plane TCP 6443 ingress (Kubernetes API) is allowed to the entire network.
- Control plane TCP 22623 ingress (MCS) is allowed to the entire network.
9.3.4. Allowing endpoint gateway traffic
If you are using IBM Cloud® Virtual Private endpoints, your Virtual Private Cloud (VPC) must be configured to allow traffic to and from the endpoint gateways.
A VPC’s default security group is configured to allow all outbound traffic to endpoint gateways. Therefore, the simplest way to allow traffic between your VPC and endpoint gateways is to modify the default security group to allow inbound traffic on port 443.
If you choose to configure a new security group, the security group must be configured to allow both inbound and outbound traffic.
Prerequisites
-
You have installed the IBM Cloud® Command Line Interface utility (
ibmcloud
).
Procedure
Obtain the identifier for the default security group by running the following command:
$ DEFAULT_SG=$(ibmcloud is vpc <your_vpc_name> --output JSON | jq -r '.default_security_group.id')
Add a rule that allows inbound traffic on port 443 by running the following command:
$ ibmcloud is security-group-rule-add $DEFAULT_SG inbound tcp --remote 0.0.0.0/0 --port-min 443 --port-max 443
Be sure that your endpoint gateways are configured to use this security group.
9.4. Generating a key pair for cluster node SSH access
During an OpenShift Container Platform installation, you can provide an SSH public key to the installation program. The key is passed to the Red Hat Enterprise Linux CoreOS (RHCOS) nodes through their Ignition config files and is used to authenticate SSH access to the nodes. The key is added to the ~/.ssh/authorized_keys
list for the core
user on each node, which enables password-less authentication.
After the key is passed to the nodes, you can use the key pair to SSH in to the RHCOS nodes as the user core
. To access the nodes through SSH, the private key identity must be managed by SSH for your local user.
If you want to SSH in to your cluster nodes to perform installation debugging or disaster recovery, you must provide the SSH public key during the installation process. The ./openshift-install gather
command also requires the SSH public key to be in place on the cluster nodes.
Do not skip this procedure in production environments, where disaster recovery and debugging is required.
You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs.
Procedure
If you do not have an existing SSH key pair on your local machine to use for authentication onto your cluster nodes, create one. For example, on a computer that uses a Linux operating system, run the following command:
$ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> 1
- 1
- Specify the path and file name, such as
~/.ssh/id_ed25519
, of the new SSH key. If you have an existing key pair, ensure your public key is in the your~/.ssh
directory.
NoteIf you plan to install an OpenShift Container Platform cluster that uses the RHEL cryptographic libraries that have been submitted to NIST for FIPS 140-2/140-3 Validation on only the
x86_64
,ppc64le
, ands390x
architectures, do not create a key that uses theed25519
algorithm. Instead, create a key that uses thersa
orecdsa
algorithm.View the public SSH key:
$ cat <path>/<file_name>.pub
For example, run the following to view the
~/.ssh/id_ed25519.pub
public key:$ cat ~/.ssh/id_ed25519.pub
Add the SSH private key identity to the SSH agent for your local user, if it has not already been added. SSH agent management of the key is required for password-less SSH authentication onto your cluster nodes, or if you want to use the
./openshift-install gather
command.NoteOn some distributions, default SSH private key identities such as
~/.ssh/id_rsa
and~/.ssh/id_dsa
are managed automatically.If the
ssh-agent
process is not already running for your local user, start it as a background task:$ eval "$(ssh-agent -s)"
Example output
Agent pid 31874
NoteIf your cluster is in FIPS mode, only use FIPS-compliant algorithms to generate the SSH key. The key must be either RSA or ECDSA.
Add your SSH private key to the
ssh-agent
:$ ssh-add <path>/<file_name> 1
- 1
- Specify the path and file name for your SSH private key, such as
~/.ssh/id_ed25519
Example output
Identity added: /home/<you>/<path>/<file_name> (<computer_name>)
Next steps
- When you install OpenShift Container Platform, provide the SSH public key to the installation program.
9.5. Exporting the API key
You must set the API key you created as a global variable; the installation program ingests the variable during startup to set the API key.
Prerequisites
- You have created either a user API key or service ID API key for your IBM Cloud® account.
Procedure
Export your API key for your account as a global variable:
$ export IC_API_KEY=<api_key>
You must set the variable name exactly as specified; the installation program expects the variable name to be present during startup.
9.6. Downloading the RHCOS cluster image
The installation program requires the Red Hat Enterprise Linux CoreOS (RHCOS) image to install the cluster. While optional, downloading the Red Hat Enterprise Linux CoreOS (RHCOS) before deploying removes the need for internet access when creating the cluster.
Use the installation program to locate and download the Red Hat Enterprise Linux CoreOS (RHCOS) image.
Prerequisites
- The host running the installation program has internet access.
Procedure
Change to the directory that contains the installation program and run the following command:
$ ./openshift-install coreos print-stream-json
Use the output of the command to find the location of the IBM Cloud® image.
.Example output ---- "release": "415.92.202311241643-0", "formats": { "qcow2.gz": { "disk": { "location": "https://rhcos.mirror.openshift.com/art/storage/prod/streams/4.15-9.2/builds/415.92.202311241643-0/x86_64/rhcos-415.92.202311241643-0-ibmcloud.x86_64.qcow2.gz", "sha256": "6b562dee8431bec3b93adeac1cfefcd5e812d41e3b7d78d3e28319870ffc9eae", "uncompressed-sha256": "5a0f9479505e525a30367b6a6a6547c86a8f03136f453c1da035f3aa5daa8bc9" ----
- Download and extract the image archive. Make the image available on the host that the installation program uses to create the cluster.
9.7. Manually creating the installation configuration file
Installing the cluster requires that you manually create the installation configuration file.
Prerequisites
- You have obtained the OpenShift Container Platform installation program and the pull secret for your cluster.
-
You have the
imageContentSourcePolicy.yaml
file that was created when you mirrored your registry. - You have obtained the contents of the certificate for your mirror registry.
Procedure
Create an installation directory to store your required installation assets in:
$ mkdir <installation_directory>
ImportantYou must create a directory. Some installation assets, like bootstrap X.509 certificates have short expiration intervals, so you must not reuse an installation directory. If you want to reuse individual files from another cluster installation, you can copy them into your directory. However, the file names for the installation assets might change between releases. Use caution when copying installation files from an earlier OpenShift Container Platform version.
Customize the sample
install-config.yaml
file template that is provided and save it in the<installation_directory>
.NoteYou must name this configuration file
install-config.yaml
.When customizing the sample template, be sure to provide the information that is required for an installation in a restricted network:
Update the
pullSecret
value to contain the authentication information for your registry:pullSecret: '{"auths":{"<mirror_host_name>:5000": {"auth": "<credentials>","email": "you@example.com"}}}'
For
<mirror_host_name>
, specify the registry domain name that you specified in the certificate for your mirror registry, and for<credentials>
, specify the base64-encoded user name and password for your mirror registry.Add the
additionalTrustBundle
parameter and value.additionalTrustBundle: | -----BEGIN CERTIFICATE----- ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ -----END CERTIFICATE-----
The value must be the contents of the certificate file that you used for your mirror registry. The certificate file can be an existing, trusted certificate authority, or the self-signed certificate that you generated for the mirror registry.
Define the network and subnets for the VPC to install the cluster in under the parent
platform.ibmcloud
field:vpcName: <existing_vpc> controlPlaneSubnets: <control_plane_subnet> computeSubnets: <compute_subnet>
For
platform.ibmcloud.vpcName
, specify the name for the existing IBM Cloud VPC. Forplatform.ibmcloud.controlPlaneSubnets
andplatform.ibmcloud.computeSubnets
, specify the existing subnets to deploy the control plane machines and compute machines, respectively.Add the image content resources, which resemble the following YAML excerpt:
imageContentSources: - mirrors: - <mirror_host_name>:5000/<repo_name>/release source: quay.io/openshift-release-dev/ocp-release - mirrors: - <mirror_host_name>:5000/<repo_name>/release source: registry.redhat.io/ocp/release
For these values, use the
imageContentSourcePolicy.yaml
file that was created when you mirrored the registry.If network restrictions limit the use of public endpoints to access the required IBM Cloud® services, add the
serviceEndpoints
stanza toplatform.ibmcloud
to specify an alternate service endpoint.NoteYou can specify only one alternate service endpoint for each service.
Example of using alternate services endpoints
# ... serviceEndpoints: - name: IAM url: <iam_alternate_endpoint_url> - name: VPC url: <vpc_alternate_endpoint_url> - name: ResourceController url: <resource_controller_alternate_endpoint_url> - name: ResourceManager url: <resource_manager_alternate_endpoint_url> - name: DNSServices url: <dns_services_alternate_endpoint_url> - name: COS url: <cos_alternate_endpoint_url> - name: GlobalSearch url: <global_search_alternate_endpoint_url> - name: GlobalTagging url: <global_tagging_alternate_endpoint_url> # ...
Optional: Set the publishing strategy to
Internal
:publish: Internal
By setting this option, you create an internal Ingress Controller and a private load balancer.
NoteIf you use the default value of
External
, your network must be able to access the public endpoint for IBM Cloud® Internet Services (CIS). CIS is not enabled for Virtual Private Endpoints.
Back up the
install-config.yaml
file so that you can use it to install multiple clusters.ImportantThe
install-config.yaml
file is consumed during the next step of the installation process. You must back it up now.
9.7.1. Configuring the cluster-wide proxy during installation
Production environments can deny direct access to the internet and instead have an HTTP or HTTPS proxy available. You can configure a new OpenShift Container Platform cluster to use a proxy by configuring the proxy settings in the install-config.yaml
file.
Prerequisites
-
You have an existing
install-config.yaml
file. You reviewed the sites that your cluster requires access to and determined whether any of them need to bypass the proxy. By default, all cluster egress traffic is proxied, including calls to hosting cloud provider APIs. You added sites to the
Proxy
object’sspec.noProxy
field to bypass the proxy if necessary.NoteThe
Proxy
objectstatus.noProxy
field is populated with the values of thenetworking.machineNetwork[].cidr
,networking.clusterNetwork[].cidr
, andnetworking.serviceNetwork[]
fields from your installation configuration.For installations on Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, and Red Hat OpenStack Platform (RHOSP), the
Proxy
objectstatus.noProxy
field is also populated with the instance metadata endpoint (169.254.169.254
).
Procedure
Edit your
install-config.yaml
file and add the proxy settings. For example:apiVersion: v1 baseDomain: my.domain.com proxy: httpProxy: http://<username>:<pswd>@<ip>:<port> 1 httpsProxy: https://<username>:<pswd>@<ip>:<port> 2 noProxy: example.com 3 additionalTrustBundle: | 4 -----BEGIN CERTIFICATE----- <MY_TRUSTED_CA_CERT> -----END CERTIFICATE----- additionalTrustBundlePolicy: <policy_to_add_additionalTrustBundle> 5
- 1
- A proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be
http
. - 2
- A proxy URL to use for creating HTTPS connections outside the cluster.
- 3
- A comma-separated list of destination domain names, IP addresses, or other network CIDRs to exclude from proxying. Preface a domain with
.
to match subdomains only. For example,.y.com
matchesx.y.com
, but noty.com
. Use*
to bypass the proxy for all destinations. - 4
- If provided, the installation program generates a config map that is named
user-ca-bundle
in theopenshift-config
namespace that contains one or more additional CA certificates that are required for proxying HTTPS connections. The Cluster Network Operator then creates atrusted-ca-bundle
config map that merges these contents with the Red Hat Enterprise Linux CoreOS (RHCOS) trust bundle, and this config map is referenced in thetrustedCA
field of theProxy
object. TheadditionalTrustBundle
field is required unless the proxy’s identity certificate is signed by an authority from the RHCOS trust bundle. - 5
- Optional: The policy to determine the configuration of the
Proxy
object to reference theuser-ca-bundle
config map in thetrustedCA
field. The allowed values areProxyonly
andAlways
. UseProxyonly
to reference theuser-ca-bundle
config map only whenhttp/https
proxy is configured. UseAlways
to always reference theuser-ca-bundle
config map. The default value isProxyonly
.
NoteThe installation program does not support the proxy
readinessEndpoints
field.NoteIf the installer times out, restart and then complete the deployment by using the
wait-for
command of the installer. For example:$ ./openshift-install wait-for install-complete --log-level debug
- Save the file and reference it when installing OpenShift Container Platform.
The installation program creates a cluster-wide proxy that is named cluster
that uses the proxy settings in the provided install-config.yaml
file. If no proxy settings are provided, a cluster
Proxy
object is still created, but it will have a nil spec
.
Only the Proxy
object named cluster
is supported, and no additional proxies can be created.
Additional resources
9.7.2. Minimum resource requirements for cluster installation
Each cluster machine must meet the following minimum requirements:
Machine | Operating System | vCPU | Virtual RAM | Storage | Input/Output Per Second (IOPS) |
---|---|---|---|---|---|
Bootstrap | RHCOS | 4 | 16 GB | 100 GB | 300 |
Control plane | RHCOS | 4 | 16 GB | 100 GB | 300 |
Compute | RHCOS | 2 | 8 GB | 100 GB | 300 |
As of OpenShift Container Platform version 4.13, RHCOS is based on RHEL version 9.2, which updates the micro-architecture requirements. The following list contains the minimum instruction set architectures (ISA) that each architecture requires:
- x86-64 architecture requires x86-64-v2 ISA
- ARM64 architecture requires ARMv8.0-A ISA
- IBM Power architecture requires Power 9 ISA
- s390x architecture requires z14 ISA
For more information, see RHEL Architectures.
If an instance type for your platform meets the minimum requirements for cluster machines, it is supported to use in OpenShift Container Platform.
9.7.3. Tested instance types for IBM Cloud
The following IBM Cloud® instance types have been tested with OpenShift Container Platform.
Example 9.1. Machine series
-
bx2-8x32
-
bx2d-4x16
-
bx3d-4x20
-
cx2-8x16
-
cx2d-4x8
-
cx3d-8x20
-
gx2-8x64x1v100
-
gx3-16x80x1l4
-
mx2-8x64
-
mx2d-4x32
-
mx3d-2x20
-
ox2-4x32
-
ox2-8x64
-
ux2d-2x56
-
vx2d-4x56
9.7.4. Sample customized install-config.yaml file for IBM Cloud
You can customize the install-config.yaml
file to specify more details about your OpenShift Container Platform cluster’s platform or modify the values of the required parameters.
This sample YAML file is provided for reference only. You must obtain your install-config.yaml
file by using the installation program and then modify it.
apiVersion: v1 baseDomain: example.com 1 controlPlane: 2 3 hyperthreading: Enabled 4 name: master platform: ibm-cloud: {} replicas: 3 compute: 5 6 - hyperthreading: Enabled 7 name: worker platform: ibmcloud: {} replicas: 3 metadata: name: test-cluster 8 networking: clusterNetwork: - cidr: 10.128.0.0/14 9 hostPrefix: 23 machineNetwork: - cidr: 10.0.0.0/16 10 networkType: OVNKubernetes 11 serviceNetwork: - 172.30.0.0/16 platform: ibmcloud: region: us-east 12 resourceGroupName: us-east-example-cluster-rg 13 serviceEndpoints: 14 - name: IAM url: https://private.us-east.iam.cloud.ibm.com - name: VPC url: https://us-east.private.iaas.cloud.ibm.com/v1 - name: ResourceController url: https://private.us-east.resource-controller.cloud.ibm.com - name: ResourceManager url: https://private.us-east.resource-controller.cloud.ibm.com - name: DNSServices url: https://api.private.dns-svcs.cloud.ibm.com/v1 - name: COS url: https://s3.direct.us-east.cloud-object-storage.appdomain.cloud - name: GlobalSearch url: https://api.private.global-search-tagging.cloud.ibm.com - name: GlobalTagging url: https://tags.private.global-search-tagging.cloud.ibm.com networkResourceGroupName: us-east-example-existing-network-rg 15 vpcName: us-east-example-network-1 16 controlPlaneSubnets: 17 - us-east-example-network-1-cp-us-east-1 - us-east-example-network-1-cp-us-east-2 - us-east-example-network-1-cp-us-east-3 computeSubnets: 18 - us-east-example-network-1-compute-us-east-1 - us-east-example-network-1-compute-us-east-2 - us-east-example-network-1-compute-us-east-3 credentialsMode: Manual pullSecret: '{"auths":{"<local_registry>": {"auth": "<credentials>","email": "you@example.com"}}}' 19 fips: false 20 sshKey: ssh-ed25519 AAAA... 21 additionalTrustBundle: | 22 -----BEGIN CERTIFICATE----- <MY_TRUSTED_CA_CERT> -----END CERTIFICATE----- imageContentSources: 23 - mirrors: - <local_registry>/<local_repository_name>/release source: quay.io/openshift-release-dev/ocp-release - mirrors: - <local_registry>/<local_repository_name>/release source: quay.io/openshift-release-dev/ocp-v4.0-art-dev
- 1 8 12
- Required.
- 2 5
- If you do not provide these parameters and values, the installation program provides the default value.
- 3 6
- The
controlPlane
section is a single mapping, but thecompute
section is a sequence of mappings. To meet the requirements of the different data structures, the first line of thecompute
section must begin with a hyphen,-
, and the first line of thecontrolPlane
section must not. Only one control plane pool is used. - 4 7
- Enables or disables simultaneous multithreading, also known as Hyper-Threading. By default, simultaneous multithreading is enabled to increase the performance of your machines' cores. You can disable it by setting the parameter value to
Disabled
. If you disable simultaneous multithreading in some cluster machines, you must disable it in all cluster machines.ImportantIf you disable simultaneous multithreading, ensure that your capacity planning accounts for the dramatically decreased machine performance. Use larger machine types, such as
n1-standard-8
, for your machines if you disable simultaneous multithreading. - 9
- The machine CIDR must contain the subnets for the compute machines and control plane machines.
- 10
- The CIDR must contain the subnets defined in
platform.ibmcloud.controlPlaneSubnets
andplatform.ibmcloud.computeSubnets
. - 11
- The cluster network plugin to install. The default value
OVNKubernetes
is the only supported value. - 13
- The name of an existing resource group. All installer-provisioned cluster resources are deployed to this resource group. If undefined, a new resource group is created for the cluster.
- 14
- Based on the network restrictions of the VPC, specify alternate service endpoints as needed. This overrides the default public endpoint for the service.
- 15
- Specify the name of the resource group that contains the existing virtual private cloud (VPC). The existing VPC and subnets should be in this resource group. The cluster will be installed to this VPC.
- 16
- Specify the name of an existing VPC.
- 17
- Specify the name of the existing subnets to which to deploy the control plane machines. The subnets must belong to the VPC that you specified. Specify a subnet for each availability zone in the region.
- 18
- Specify the name of the existing subnets to which to deploy the compute machines. The subnets must belong to the VPC that you specified. Specify a subnet for each availability zone in the region.
- 19
- For
<local_registry>
, specify the registry domain name, and optionally the port, that your mirror registry uses to serve content. For example, registry.example.com or registry.example.com:5000. For<credentials>
, specify the base64-encoded user name and password for your mirror registry. - 20
- Enables or disables FIPS mode. By default, FIPS mode is not enabled. If FIPS mode is enabled, the Red Hat Enterprise Linux CoreOS (RHCOS) machines that OpenShift Container Platform runs on bypass the default Kubernetes cryptography suite and use the cryptography modules that are provided with RHCOS instead.Important
The use of FIPS Validated or Modules in Process cryptographic libraries is only supported on OpenShift Container Platform deployments on the
x86_64
architecture. - 21
- Optional: provide the
sshKey
value that you use to access the machines in your cluster. - 22
- Provide the contents of the certificate file that you used for your mirror registry.
- 23
- Provide these values from the
metadata.name: release-0
section of theimageContentSourcePolicy.yaml
file that was created when you mirrored the registry.NoteFor production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery, specify an SSH key that your
ssh-agent
process uses.
9.8. Installing the OpenShift CLI by downloading the binary
You can install the OpenShift CLI (oc
) to interact with OpenShift Container Platform from a command-line interface. You can install oc
on Linux, Windows, or macOS.
If you installed an earlier version of oc
, you cannot use it to complete all of the commands in OpenShift Container Platform 4.15. Download and install the new version of oc
.
Installing the OpenShift CLI on Linux
You can install the OpenShift CLI (oc
) binary on Linux by using the following procedure.
Procedure
- Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
- Select the architecture from the Product Variant drop-down list.
- Select the appropriate version from the Version drop-down list.
- Click Download Now next to the OpenShift v4.15 Linux Client entry and save the file.
Unpack the archive:
$ tar xvf <file>
Place the
oc
binary in a directory that is on yourPATH
.To check your
PATH
, execute the following command:$ echo $PATH
Verification
After you install the OpenShift CLI, it is available using the
oc
command:$ oc <command>
Installing the OpenShift CLI on Windows
You can install the OpenShift CLI (oc
) binary on Windows by using the following procedure.
Procedure
- Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
- Select the appropriate version from the Version drop-down list.
- Click Download Now next to the OpenShift v4.15 Windows Client entry and save the file.
- Unzip the archive with a ZIP program.
Move the
oc
binary to a directory that is on yourPATH
.To check your
PATH
, open the command prompt and execute the following command:C:\> path
Verification
After you install the OpenShift CLI, it is available using the
oc
command:C:\> oc <command>
Installing the OpenShift CLI on macOS
You can install the OpenShift CLI (oc
) binary on macOS by using the following procedure.
Procedure
- Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
- Select the appropriate version from the Version drop-down list.
Click Download Now next to the OpenShift v4.15 macOS Client entry and save the file.
NoteFor macOS arm64, choose the OpenShift v4.15 macOS arm64 Client entry.
- Unpack and unzip the archive.
Move the
oc
binary to a directory on your PATH.To check your
PATH
, open a terminal and execute the following command:$ echo $PATH
Verification
Verify your installation by using an
oc
command:$ oc <command>
9.9. Manually creating IAM
Installing the cluster requires that the Cloud Credential Operator (CCO) operate in manual mode. While the installation program configures the CCO for manual mode, you must specify the identity and access management secrets for you cloud provider.
You can use the Cloud Credential Operator (CCO) utility (ccoctl
) to create the required IBM Cloud® resources.
Prerequisites
-
You have configured the
ccoctl
binary. -
You have an existing
install-config.yaml
file.
Procedure
Edit the
install-config.yaml
configuration file so that it contains thecredentialsMode
parameter set toManual
.Example
install-config.yaml
configuration fileapiVersion: v1 baseDomain: cluster1.example.com credentialsMode: Manual 1 compute: - architecture: amd64 hyperthreading: Enabled
- 1
- This line is added to set the
credentialsMode
parameter toManual
.
To generate the manifests, run the following command from the directory that contains the installation program:
$ ./openshift-install create manifests --dir <installation_directory>
From the directory that contains the installation program, set a
$RELEASE_IMAGE
variable with the release image from your installation file by running the following command:$ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
Extract the list of
CredentialsRequest
custom resources (CRs) from the OpenShift Container Platform release image by running the following command:$ oc adm release extract \ --from=$RELEASE_IMAGE \ --credentials-requests \ --included \1 --install-config=<path_to_directory_with_installation_configuration>/install-config.yaml \2 --to=<path_to_directory_for_credentials_requests> 3
- 1
- The
--included
parameter includes only the manifests that your specific cluster configuration requires. - 2
- Specify the location of the
install-config.yaml
file. - 3
- Specify the path to the directory where you want to store the
CredentialsRequest
objects. If the specified directory does not exist, this command creates it.
This command creates a YAML file for each
CredentialsRequest
object.Sample
CredentialsRequest
objectapiVersion: cloudcredential.openshift.io/v1 kind: CredentialsRequest metadata: labels: controller-tools.k8s.io: "1.0" name: openshift-image-registry-ibmcos namespace: openshift-cloud-credential-operator spec: secretRef: name: installer-cloud-credentials namespace: openshift-image-registry providerSpec: apiVersion: cloudcredential.openshift.io/v1 kind: IBMCloudProviderSpec policies: - attributes: - name: serviceName value: cloud-object-storage roles: - crn:v1:bluemix:public:iam::::role:Viewer - crn:v1:bluemix:public:iam::::role:Operator - crn:v1:bluemix:public:iam::::role:Editor - crn:v1:bluemix:public:iam::::serviceRole:Reader - crn:v1:bluemix:public:iam::::serviceRole:Writer - attributes: - name: resourceType value: resource-group roles: - crn:v1:bluemix:public:iam::::role:Viewer
Create the service ID for each credential request, assign the policies defined, create an API key, and generate the secret:
$ ccoctl ibmcloud create-service-id \ --credentials-requests-dir=<path_to_credential_requests_directory> \1 --name=<cluster_name> \2 --output-dir=<installation_directory> \3 --resource-group-name=<resource_group_name> 4
- 1
- Specify the directory containing the files for the component
CredentialsRequest
objects. - 2
- Specify the name of the OpenShift Container Platform cluster.
- 3
- Optional: Specify the directory in which you want the
ccoctl
utility to create objects. By default, the utility creates objects in the directory in which the commands are run. - 4
- Optional: Specify the name of the resource group used for scoping the access policies.
NoteIf your cluster uses Technology Preview features that are enabled by the
TechPreviewNoUpgrade
feature set, you must include the--enable-tech-preview
parameter.If an incorrect resource group name is provided, the installation fails during the bootstrap phase. To find the correct resource group name, run the following command:
$ grep resourceGroupName <installation_directory>/manifests/cluster-infrastructure-02-config.yml
Verification
-
Ensure that the appropriate secrets were generated in your cluster’s
manifests
directory.
9.10. Deploying the cluster
You can install OpenShift Container Platform on a compatible cloud platform.
You can run the create cluster
command of the installation program only once, during initial installation.
Prerequisites
- You have configured an account with the cloud platform that hosts your cluster.
You have the OpenShift Container Platform installation program and the pull secret for your cluster.
If the Red Hat Enterprise Linux CoreOS (RHCOS) image is available locally, the host running the installation program does not require internet access.
- You have verified that the cloud provider account on your host has the correct permissions to deploy the cluster. An account with incorrect permissions causes the installation process to fail with an error message that displays the missing permissions.
Procedure
Export the
OPENSHIFT_INSTALL_OS_IMAGE_OVERRIDE
variable to specify the location of the Red Hat Enterprise Linux CoreOS (RHCOS) image by running the following command:$ export OPENSHIFT_INSTALL_OS_IMAGE_OVERRIDE="<path_to_image>/rhcos-<image_version>-ibmcloud.x86_64.qcow2.gz"
Change to the directory that contains the installation program and initialize the cluster deployment:
$ ./openshift-install create cluster --dir <installation_directory> \ 1 --log-level=info 2
Verification
When the cluster deployment completes successfully:
-
The terminal displays directions for accessing your cluster, including a link to the web console and credentials for the
kubeadmin
user. -
Credential information also outputs to
<installation_directory>/.openshift_install.log
.
Do not delete the installation program or the files that the installation program creates. Both are required to delete the cluster.
Example output
... INFO Install complete! INFO To access the cluster as the system:admin user when using 'oc', run 'export KUBECONFIG=/home/myuser/install_dir/auth/kubeconfig' INFO Access the OpenShift web-console here: https://console-openshift-console.apps.mycluster.example.com INFO Login to the console with user: "kubeadmin", and password: "password" INFO Time elapsed: 36m22s
-
The Ignition config files that the installation program generates contain certificates that expire after 24 hours, which are then renewed at that time. If the cluster is shut down before renewing the certificates and the cluster is later restarted after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending
node-bootstrapper
certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information. - It is recommended that you use Ignition config files within 12 hours after they are generated because the 24-hour certificate rotates from 16 to 22 hours after the cluster is installed. By using the Ignition config files within 12 hours, you can avoid installation failure if the certificate update runs during installation.
9.11. Logging in to the cluster by using the CLI
You can log in to your cluster as a default system user by exporting the cluster kubeconfig
file. The kubeconfig
file contains information about the cluster that is used by the CLI to connect a client to the correct cluster and API server. The file is specific to a cluster and is created during OpenShift Container Platform installation.
Prerequisites
- You deployed an OpenShift Container Platform cluster.
-
You installed the
oc
CLI.
Procedure
Export the
kubeadmin
credentials:$ export KUBECONFIG=<installation_directory>/auth/kubeconfig 1
- 1
- For
<installation_directory>
, specify the path to the directory that you stored the installation files in.
Verify you can run
oc
commands successfully using the exported configuration:$ oc whoami
Example output
system:admin
Additional resources
9.12. Post installation
Complete the following steps to complete the configuration of your cluster.
9.12.1. Disabling the default OperatorHub catalog sources
Operator catalogs that source content provided by Red Hat and community projects are configured for OperatorHub by default during an OpenShift Container Platform installation. In a restricted network environment, you must disable the default catalogs as a cluster administrator.
Procedure
Disable the sources for the default catalogs by adding
disableAllDefaultSources: true
to theOperatorHub
object:$ oc patch OperatorHub cluster --type json \ -p '[{"op": "add", "path": "/spec/disableAllDefaultSources", "value": true}]'
Alternatively, you can use the web console to manage catalog sources. From the Administration
9.12.2. Installing the policy resources into the cluster
Mirroring the OpenShift Container Platform content using the oc-mirror OpenShift CLI (oc) plugin creates resources, which include catalogSource-certified-operator-index.yaml
and imageContentSourcePolicy.yaml
.
-
The
ImageContentSourcePolicy
resource associates the mirror registry with the source registry and redirects image pull requests from the online registries to the mirror registry. -
The
CatalogSource
resource is used by Operator Lifecycle Manager (OLM) to retrieve information about the available Operators in the mirror registry, which lets users discover and install Operators.
After you install the cluster, you must install these resources into the cluster.
Prerequisites
- You have mirrored the image set to the registry mirror in the disconnected environment.
-
You have access to the cluster as a user with the
cluster-admin
role.
Procedure
-
Log in to the OpenShift CLI as a user with the
cluster-admin
role. Apply the YAML files from the results directory to the cluster:
$ oc apply -f ./oc-mirror-workspace/results-<id>/
Verification
Verify that the
ImageContentSourcePolicy
resources were successfully installed:$ oc get imagecontentsourcepolicy
Verify that the
CatalogSource
resources were successfully installed:$ oc get catalogsource --all-namespaces
9.13. Telemetry access for OpenShift Container Platform
In OpenShift Container Platform 4.15, the Telemetry service, which runs by default to provide metrics about cluster health and the success of updates, requires internet access. If your cluster is connected to the internet, Telemetry runs automatically, and your cluster is registered to OpenShift Cluster Manager.
After you confirm that your OpenShift Cluster Manager inventory is correct, either maintained automatically by Telemetry or manually by using OpenShift Cluster Manager, use subscription watch to track your OpenShift Container Platform subscriptions at the account or multi-cluster level.
Additional resources