Chapter 9. Installing a cluster on Azure into a government region
In OpenShift Container Platform version 4.16, you can install a cluster on Microsoft Azure into a government region. To configure the government region, you modify parameters in the install-config.yaml file before you install the cluster.
9.1. Prerequisites
- You reviewed details about the OpenShift Container Platform installation and update processes.
- You read the documentation on selecting a cluster installation method and preparing it for users.
- You configured an Azure account to host the cluster and determined the tested and validated government region to deploy the cluster to.
- If you use a firewall, you configured it to allow the sites that your cluster requires access to.
-
If the cloud identity and access management (IAM) APIs are not accessible in your environment, or if you do not want to store an administrator-level credential secret in the
kube-systemnamespace, you can manually create and maintain long-term credentials. - If you use customer-managed encryption keys, you prepared your Azure environment for encryption.
9.2. Azure government regions
OpenShift Container Platform supports deploying a cluster to Microsoft Azure Government (MAG) regions. MAG is specifically designed for US government agencies at the federal, state, and local level, as well as contractors, educational institutions, and other US customers that must run sensitive workloads on Azure. MAG is composed of government-only data center regions, all granted an Impact Level 5 Provisional Authorization.
Installing to a MAG region requires manually configuring the Azure Government dedicated cloud instance and region in the install-config.yaml file. You must also update your service principal to reference the appropriate government environment.
The Azure government region cannot be selected using the guided terminal prompts from the installation program. You must define the region manually in the install-config.yaml file. Remember to also set the dedicated cloud instance, like AzureUSGovernmentCloud, based on the region specified.
9.3. Private clusters
You can deploy a private OpenShift Container Platform cluster that does not expose external endpoints. Private clusters are accessible from only an internal network and are not visible to the internet.
By default, OpenShift Container Platform is provisioned to use publicly-accessible DNS and endpoints. A private cluster sets the DNS, Ingress Controller, and API server to private when you deploy your cluster. This means that the cluster resources are only accessible from your internal network and are not visible to the internet.
If the cluster has any public subnets, load balancer services created by administrators might be publicly accessible. To ensure cluster security, verify that these services are explicitly annotated as private.
To deploy a private cluster, you must:
- Use existing networking that meets your requirements. Your cluster resources might be shared between other clusters on the network.
Deploy from a machine that has access to:
- The API services for the cloud to which you provision.
- The hosts on the network that you provision.
- The internet to obtain installation media.
You can use any machine that meets these access requirements and follows your company’s guidelines. For example, this machine can be a bastion host on your cloud network or a machine that has access to the network through a VPN.
9.3.1. Private clusters in Azure
To create a private cluster on Microsoft Azure, you must provide an existing private VNet and subnets to host the cluster. The installation program must also be able to resolve the DNS records that the cluster requires. The installation program configures the Ingress Operator and API server for only internal traffic.
Depending how your network connects to the private VNET, you might need to use a DNS forwarder to resolve the cluster’s private DNS records. The cluster’s machines use 168.63.129.16 internally for DNS resolution. For more information, see What is Azure Private DNS? and What is IP address 168.63.129.16? in the Azure documentation.
The cluster still requires access to internet to access the Azure APIs.
The following items are not required or created when you install a private cluster:
-
A
BaseDomainResourceGroup, since the cluster does not create public records - Public IP addresses
- Public DNS records
Public endpoints
The cluster is configured so that the Operators do not create public records for the cluster and all cluster machines are placed in the private subnets that you specify.
9.3.1.1. Limitations
Private clusters on Azure are subject to only the limitations that are associated with the use of an existing VNet.
9.3.2. User-defined outbound routing
In OpenShift Container Platform, you can choose your own outbound routing for a cluster to connect to the internet. This allows you to skip the creation of public IP addresses and the public load balancer.
You can configure user-defined routing by modifying parameters in the install-config.yaml file before installing your cluster. A pre-existing VNet is required to use outbound routing when installing a cluster; the installation program is not responsible for configuring this.
When configuring a cluster to use user-defined routing, the installation program does not create the following resources:
- Outbound rules for access to the internet.
- Public IPs for the public load balancer.
- Kubernetes Service object to add the cluster machines to the public load balancer for outbound requests.
You must ensure the following items are available before setting user-defined routing:
- Egress to the internet is possible to pull container images, unless using an OpenShift image registry mirror.
- The cluster can access Azure APIs.
- Various allowlist endpoints are configured. You can reference these endpoints in the Configuring your firewall section.
There are several pre-existing networking setups that are supported for internet access using user-defined routing.
9.4. About reusing a VNet for your OpenShift Container Platform cluster
In OpenShift Container Platform 4.16, you can deploy a cluster into an existing Azure Virtual Network (VNet) in Microsoft Azure. If you do, you must also use existing subnets within the VNet and routing rules.
By deploying OpenShift Container Platform into an existing Azure VNet, you might be able to avoid service limit constraints in new accounts or more easily abide by the operational constraints that your company’s guidelines set. This is a good option to use if you cannot obtain the infrastructure creation permissions that are required to create the VNet.
9.4.1. Requirements for using your VNet
When you deploy a cluster by using an existing VNet, you must perform additional network configuration before you install the cluster. In installer-provisioned infrastructure clusters, the installer usually creates the following components, but it does not create them when you install into an existing VNet:
- Subnets
- Route tables
- VNets
- Network Security Groups
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.
If you use a custom VNet, you must correctly configure it and its subnets for the installation program and the cluster to use. The installation program cannot subdivide network ranges for the cluster to use, set route tables for the subnets, or set VNet options like DHCP, so you must do so before you install the cluster.
The cluster must be able to access the resource group that contains the existing VNet and subnets. While all of the resources that the cluster creates are placed in a separate resource group that it creates, some network resources are used from a separate group. Some cluster Operators must be able to access resources in both resource groups. For example, the Machine API controller attaches NICS for the virtual machines that it creates to subnets from the networking resource group.
Your VNet must meet the following characteristics:
-
The VNet’s CIDR block must contain the
Networking.MachineCIDRrange, which is the IP address pool for cluster machines. - The VNet and its subnets must belong to the same resource group, and the subnets must be configured to use Azure-assigned DHCP IP addresses instead of static IP addresses.
You must provide two subnets within your VNet, one for the control plane machines and one for the compute machines. Because Azure distributes machines in different availability zones within the region that you specify, your cluster will have high availability by default.
By default, if you specify availability zones in the install-config.yaml file, the installation program distributes the control plane machines and the compute machines across these availability zones within a region. To ensure high availability for your cluster, select a region with at least three availability zones. If your region contains fewer than three availability zones, the installation program places more than one control plane machine in the available zones.
To ensure that the subnets that you provide are suitable, the installation program confirms the following data:
- All the specified subnets exist.
- There are two private subnets, one for the control plane machines and one for the compute machines.
- The subnet CIDRs belong to the machine CIDR that you specified. Machines are not provisioned in availability zones that you do not provide private subnets for. If required, the installation program creates public load balancers that manage the control plane and worker nodes, and Azure allocates a public IP address to them.
If you destroy a cluster that uses an existing VNet, the VNet is not deleted.
9.4.1.1. Network security group requirements
The network security groups for the subnets that host the compute and control plane machines require specific access to ensure that the cluster communication is correct. You must create rules to allow access to the required cluster communication ports.
The network security group rules must be in place before you install the cluster. If you attempt to install a cluster without the required access, the installation program cannot reach the Azure APIs, and installation fails.
| Port | Description | Control plane | Compute |
|---|---|---|---|
|
| Allows HTTP traffic | x | |
|
| Allows HTTPS traffic | x | |
|
| Allows communication to the control plane machines | x | |
|
| Allows internal communication to the machine config server for provisioning machines | x |
- If you are using Azure Firewall to restrict the internet access, then you can configure Azure Firewall to allow the Azure APIs. A network security group rule is not needed.
Currently, there is no supported way to block or restrict the machine config server endpoint. The machine config server must be exposed to the network so that newly-provisioned machines, which have no existing configuration or state, are able to fetch their configuration. In this model, the root of trust is the certificate signing requests (CSR) endpoint, which is where the kubelet sends its certificate signing request for approval to join the cluster. Because of this, machine configs should not be used to distribute sensitive information, such as secrets and certificates.
To ensure that the machine config server endpoints, ports 22623 and 22624, are secured in bare metal scenarios, customers must configure proper network policies.
Because cluster components do not modify the user-provided network security groups, which the Kubernetes controllers update, a pseudo-network security group is created for the Kubernetes controller to modify without impacting the rest of the environment.
| Protocol | Port | Description |
|---|---|---|
| ICMP | N/A | Network reachability tests |
| TCP |
| Metrics |
|
|
Host level services, including the node exporter on ports | |
|
| The default ports that Kubernetes reserves | |
| UDP |
| VXLAN |
|
| Geneve | |
|
|
Host level services, including the node exporter on ports | |
|
| IPsec IKE packets | |
|
| IPsec NAT-T packets | |
|
|
Network Time Protocol (NTP) on UDP port
If you configure an external NTP time server, you must open UDP port | |
| TCP/UDP |
| Kubernetes node port |
| ESP | N/A | IPsec Encapsulating Security Payload (ESP) |
| Protocol | Port | Description |
|---|---|---|
| TCP |
| etcd server and peer ports |
Additional resources
9.4.2. Division of permissions
Starting with OpenShift Container Platform 4.3, you do not need all of the permissions that are required for an installation program-provisioned infrastructure cluster to deploy a cluster. This change mimics the division of permissions that you might have at your company: some individuals can create different resources in your clouds than others. For example, you might be able to create application-specific items, like instances, storage, and load balancers, but not networking-related components such as VNets, subnet, or ingress rules.
The Azure credentials that you use when you create your cluster do not need the networking permissions that are required to make VNets and core networking components within the VNet, such as subnets, routing tables, internet gateways, NAT, and VPN. You still need permission to make the application resources that the machines within the cluster require, such as load balancers, security groups, storage accounts, and nodes.
9.4.3. Isolation between clusters
Because the cluster is unable to modify network security groups in an existing subnet, there is no way to isolate clusters from each other on the VNet.
9.5. Internet access for OpenShift Container Platform
In OpenShift Container Platform 4.16, you require access to the internet to install your cluster.
You must have internet access to:
- Access OpenShift Cluster Manager to download the installation program and perform subscription management. If the cluster has internet access and you do not disable Telemetry, that service automatically entitles your cluster.
- Access Quay.io to obtain the packages that are required to install your cluster.
- Obtain the packages that are required to perform cluster updates.
If your cluster cannot have direct internet access, you can perform a restricted network installation on some types of infrastructure that you provision. During that process, you download the required content and use it to populate a mirror registry with the installation packages. With some installation types, the environment that you install your cluster in will not require internet access. Before you update the cluster, you update the content of the mirror registry.
9.6. 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~/.sshdirectory.
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, ands390xarchitectures, do not create a key that uses theed25519algorithm. Instead, create a key that uses thersaorecdsaalgorithm.View the public SSH key:
$ cat <path>/<file_name>.pub
For example, run the following to view the
~/.ssh/id_ed25519.pubpublic 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 gathercommand.NoteOn some distributions, default SSH private key identities such as
~/.ssh/id_rsaand~/.ssh/id_dsaare managed automatically.If the
ssh-agentprocess 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.
9.7. Obtaining the installation program
Before you install OpenShift Container Platform, download the installation file on the host you are using for installation.
Prerequisites
- You have a computer that runs Linux or macOS, with at least 1.2 GB of local disk space.
Procedure
- Go to the Cluster Type page on the Red Hat Hybrid Cloud Console. If you have a Red Hat account, log in with your credentials. If you do not, create an account.
- Select your infrastructure provider from the Run it yourself section of the page.
- Select your host operating system and architecture from the dropdown menus under OpenShift Installer and click Download Installer.
Place the downloaded file in the directory where you want to store the installation configuration files.
Important- The installation program creates several files on the computer that you use to install your cluster. You must keep the installation program and the files that the installation program creates after you finish installing the cluster. Both of the files are required to delete the cluster.
- Deleting the files created by the installation program does not remove your cluster, even if the cluster failed during installation. To remove your cluster, complete the OpenShift Container Platform uninstallation procedures for your specific cloud provider.
Extract the installation program. For example, on a computer that uses a Linux operating system, run the following command:
$ tar -xvf openshift-install-linux.tar.gz
- Download your installation pull secret from Red Hat OpenShift Cluster Manager. This pull secret allows you to authenticate with the services that are provided by the included authorities, including Quay.io, which serves the container images for OpenShift Container Platform components.
Alternatively, you can retrieve the installation program from the Red Hat Customer Portal, where you can specify a version of the installation program to download. However, you must have an active subscription to access this page.
9.8. Manually creating the installation configuration file
Installing the cluster requires that you manually create the installation configuration file.
Prerequisites
- You have an SSH public key on your local machine to provide to the installation program. The key will be used for SSH authentication onto your cluster nodes for debugging and disaster recovery.
- You have obtained the OpenShift Container Platform installation program and the pull secret for your cluster.
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.yamlfile template that is provided and save it in the<installation_directory>.NoteYou must name this configuration file
install-config.yaml.Back up the
install-config.yamlfile so that you can use it to install multiple clusters.ImportantThe
install-config.yamlfile is consumed during the next step of the installation process. You must back it up now.
Additional resources
9.8.1. Minimum resource requirements for cluster installation
Each cluster machine must meet the following minimum requirements:
| Machine | Operating System | vCPU [1] | Virtual RAM | Storage | Input/Output Per Second (IOPS)[2] |
|---|---|---|---|---|---|
| Bootstrap | RHCOS | 4 | 16 GB | 100 GB | 300 |
| Control plane | RHCOS | 4 | 16 GB | 100 GB | 300 |
| Compute | RHCOS, RHEL 8.6 and later [3] | 2 | 8 GB | 100 GB | 300 |
- One vCPU is equivalent to one physical core when simultaneous multithreading (SMT), or Hyper-Threading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.
- OpenShift Container Platform and Kubernetes are sensitive to disk performance, and faster storage is recommended, particularly for etcd on the control plane nodes which require a 10 ms p99 fsync duration. Note that on many cloud platforms, storage size and IOPS scale together, so you might need to over-allocate storage volume to obtain sufficient performance.
- As with all user-provisioned installations, if you choose to use RHEL compute machines in your cluster, you take responsibility for all operating system life cycle management and maintenance, including performing system updates, applying patches, and completing all other required tasks. Use of RHEL 7 compute machines is deprecated and has been removed in OpenShift Container Platform 4.10 and later.
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.
You are required to use Azure virtual machines that have the premiumIO parameter set to true.
If an instance type for your platform meets the minimum requirements for cluster machines, it is supported to use in OpenShift Container Platform.
Additional resources
9.8.2. Tested instance types for Azure
The following Microsoft Azure instance types have been tested with OpenShift Container Platform.
Example 9.1. Machine types based on 64-bit x86 architecture
-
standardBasv2Family -
standardBSFamily -
standardBsv2Family -
standardDADSv5Family -
standardDASv4Family -
standardDASv5Family -
standardDCACCV5Family -
standardDCADCCV5Family -
standardDCADSv5Family -
standardDCASv5Family -
standardDCSv3Family -
standardDCSv2Family -
standardDDCSv3Family -
standardDDSv4Family -
standardDDSv5Family -
standardDLDSv5Family -
standardDLSv5Family -
standardDSFamily -
standardDSv2Family -
standardDSv2PromoFamily -
standardDSv3Family -
standardDSv4Family -
standardDSv5Family -
standardEADSv5Family -
standardEASv4Family -
standardEASv5Family -
standardEBDSv5Family -
standardEBSv5Family -
standardECACCV5Family -
standardECADCCV5Family -
standardECADSv5Family -
standardECASv5Family -
standardEDSv4Family -
standardEDSv5Family -
standardEIADSv5Family -
standardEIASv4Family -
standardEIASv5Family -
standardEIBDSv5Family -
standardEIBSv5Family -
standardEIDSv5Family -
standardEISv3Family -
standardEISv5Family -
standardESv3Family -
standardESv4Family -
standardESv5Family -
standardFXMDVSFamily -
standardFSFamily -
standardFSv2Family -
standardGSFamily -
standardHBrsv2Family -
standardHBSFamily -
standardHBv4Family -
standardHCSFamily -
standardHXFamily -
standardLASv3Family -
standardLSFamily -
standardLSv2Family -
standardLSv3Family -
standardMDSHighMemoryv3Family -
standardMDSMediumMemoryv2Family -
standardMDSMediumMemoryv3Family -
standardMIDSHighMemoryv3Family -
standardMIDSMediumMemoryv2Family -
standardMISHighMemoryv3Family -
standardMISMediumMemoryv2Family -
standardMSFamily -
standardMSHighMemoryv3Family -
standardMSMediumMemoryv2Family -
standardMSMediumMemoryv3Family -
StandardNCADSA100v4Family -
Standard NCASv3_T4 Family -
standardNCSv3Family -
standardNDSv2Family -
StandardNGADSV620v1Family -
standardNPSFamily -
StandardNVADSA10v5Family -
standardNVSv3Family -
standardXEISv4Family
9.8.3. Enabling trusted launch for Azure VMs
You can enable two trusted launch features when installing your cluster on Azure: secure boot and virtualized Trusted Platform Modules.
See the Azure documentation about virtual machine sizes to learn what sizes of virtual machines support these features.
Trusted launch is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.
Prerequisites
-
You have created an
install-config.yamlfile.
Procedure
Use a text editor to edit the
install-config.yamlfile prior to deploying your cluster and add the following stanza:controlPlane: 1 platform: azure: settings: securityType: TrustedLaunch 2 trustedLaunch: uefiSettings: secureBoot: Enabled 3 virtualizedTrustedPlatformModule: Enabled 4
- 1
- Specify
controlPlane.platform.azureorcompute.platform.azureto enable trusted launch on only control plane or compute nodes respectively. Specifyplatform.azure.defaultMachinePlatformto enable trusted launch on all nodes. - 2
- Enable trusted launch features.
- 3
- Enable secure boot. For more information, see the Azure documentation about secure boot.
- 4
- Enable the virtualized Trusted Platform Module. For more information, see the Azure documentation about virtualized Trusted Platform Modules.
9.8.4. Enabling confidential VMs
You can enable confidential VMs when installing your cluster. You can enable confidential VMs for compute nodes, control plane nodes, or all nodes.
Using confidential VMs is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.
For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.
You can use confidential VMs with the following VM sizes:
- DCasv5-series
- DCadsv5-series
- ECasv5-series
- ECadsv5-series
Confidential VMs are currently not supported on 64-bit ARM architectures.
Prerequisites
-
You have created an
install-config.yamlfile.
Procedure
Use a text editor to edit the
install-config.yamlfile prior to deploying your cluster and add the following stanza:controlPlane: 1 platform: azure: settings: securityType: ConfidentialVM 2 confidentialVM: uefiSettings: secureBoot: Enabled 3 virtualizedTrustedPlatformModule: Enabled 4 osDisk: securityProfile: securityEncryptionType: VMGuestStateOnly 5
- 1
- Specify
controlPlane.platform.azureorcompute.platform.azureto deploy confidential VMs on only control plane or compute nodes respectively. Specifyplatform.azure.defaultMachinePlatformto deploy confidential VMs on all nodes. - 2
- Enable confidential VMs.
- 3
- Enable secure boot. For more information, see the Azure documentation about secure boot.
- 4
- Enable the virtualized Trusted Platform Module. For more information, see the Azure documentation about virtualized Trusted Platform Modules.
- 5
- Specify
VMGuestStateOnlyto encrypt the VM guest state.
9.8.5. Sample customized install-config.yaml file for Azure
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 modify it.
apiVersion: v1 baseDomain: example.com 1 controlPlane: 2 hyperthreading: Enabled 3 4 name: master platform: azure: encryptionAtHost: true ultraSSDCapability: Enabled osDisk: diskSizeGB: 1024 5 diskType: Premium_LRS diskEncryptionSet: resourceGroup: disk_encryption_set_resource_group name: disk_encryption_set_name subscriptionId: secondary_subscription_id osImage: publisher: example_publisher_name offer: example_image_offer sku: example_offer_sku version: example_image_version type: Standard_D8s_v3 replicas: 3 compute: 6 - hyperthreading: Enabled 7 name: worker platform: azure: ultraSSDCapability: Enabled type: Standard_D2s_v3 encryptionAtHost: true osDisk: diskSizeGB: 512 8 diskType: Standard_LRS diskEncryptionSet: resourceGroup: disk_encryption_set_resource_group name: disk_encryption_set_name subscriptionId: secondary_subscription_id osImage: publisher: example_publisher_name offer: example_image_offer sku: example_offer_sku version: example_image_version zones: 9 - "1" - "2" - "3" replicas: 5 metadata: name: test-cluster 10 networking: clusterNetwork: - cidr: 10.128.0.0/14 hostPrefix: 23 machineNetwork: - cidr: 10.0.0.0/16 networkType: OVNKubernetes 11 serviceNetwork: - 172.30.0.0/16 platform: azure: defaultMachinePlatform: osImage: 12 publisher: example_publisher_name offer: example_image_offer sku: example_offer_sku version: example_image_version ultraSSDCapability: Enabled baseDomainResourceGroupName: resource_group 13 region: usgovvirginia resourceGroupName: existing_resource_group 14 networkResourceGroupName: vnet_resource_group 15 virtualNetwork: vnet 16 controlPlaneSubnet: control_plane_subnet 17 computeSubnet: compute_subnet 18 outboundType: UserDefinedRouting 19 cloudName: AzureUSGovernmentCloud 20 pullSecret: '{"auths": ...}' 21 fips: false 22 sshKey: ssh-ed25519 AAAA... 23 publish: Internal 24
- 1 10 21
- Required.
- 2 6
- If you do not provide these parameters and values, the installation program provides the default value.
- 3 7
- The
controlPlanesection is a single mapping, but thecomputesection is a sequence of mappings. To meet the requirements of the different data structures, the first line of thecomputesection must begin with a hyphen,-, and the first line of thecontrolPlanesection must not. Only one control plane pool is used. - 4
- Whether to enable or disable simultaneous multithreading, or
hyperthreading. By default, simultaneous multithreading is enabled to increase the performance of your machines' cores. You can disable it by setting the parameter value toDisabled. 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 virtual machine types, such as
Standard_D8s_v3, for your machines if you disable simultaneous multithreading. - 5 8
- You can specify the size of the disk to use in GB. Minimum recommendation for control plane nodes is 1024 GB.
- 9
- Specify a list of zones to deploy your machines to. For high availability, specify at least two zones.
- 11
- The cluster network plugin to install. The default value
OVNKubernetesis the only supported value. - 12
- Optional: A custom Red Hat Enterprise Linux CoreOS (RHCOS) image that should be used to boot control plane and compute machines. The
publisher,offer,sku, andversionparameters underplatform.azure.defaultMachinePlatform.osImageapply to both control plane and compute machines. If the parameters undercontrolPlane.platform.azure.osImageorcompute.platform.azure.osImageare set, they override theplatform.azure.defaultMachinePlatform.osImageparameters. - 13
- Specify the name of the resource group that contains the DNS zone for your base domain.
- 14
- Specify the name of an already existing resource group to install your cluster to. If undefined, a new resource group is created for the cluster.
- 15
- If you use an existing VNet, specify the name of the resource group that contains it.
- 16
- If you use an existing VNet, specify its name.
- 17
- If you use an existing VNet, specify the name of the subnet to host the control plane machines.
- 18
- If you use an existing VNet, specify the name of the subnet to host the compute machines.
- 19
- You can customize your own outbound routing. Configuring user-defined routing prevents exposing external endpoints in your cluster. User-defined routing for egress requires deploying your cluster to an existing VNet.
- 20
- Specify the name of the Azure cloud environment to deploy your cluster to. Set
AzureUSGovernmentCloudto deploy to a Microsoft Azure Government (MAG) region. The default value isAzurePublicCloud. - 22
- Whether to enable or disable 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
To enable FIPS mode for your cluster, you must run the installation program from a Red Hat Enterprise Linux (RHEL) computer configured to operate in FIPS mode. For more information about configuring FIPS mode on RHEL, see Switching RHEL to FIPS mode.
When running Red Hat Enterprise Linux (RHEL) or Red Hat Enterprise Linux CoreOS (RHCOS) booted in FIPS mode, OpenShift Container Platform core components use the RHEL cryptographic libraries that have been submitted to NIST for FIPS 140-2/140-3 Validation on only the x86_64, ppc64le, and s390x architectures.
- 23
- You can optionally provide the
sshKeyvalue that you use to access the machines in your cluster.NoteFor production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery, specify an SSH key that your
ssh-agentprocess uses. - 24
- How to publish the user-facing endpoints of your cluster. Set
publishtoInternalto deploy a private cluster, which cannot be accessed from the internet. The default value isExternal.
9.8.6. 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.yamlfile. 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
Proxyobject’sspec.noProxyfield to bypass the proxy if necessary.NoteThe
Proxyobjectstatus.noProxyfield 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
Proxyobjectstatus.noProxyfield is also populated with the instance metadata endpoint (169.254.169.254).
Procedure
Edit your
install-config.yamlfile 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.commatchesx.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-bundlein theopenshift-confignamespace that contains one or more additional CA certificates that are required for proxying HTTPS connections. The Cluster Network Operator then creates atrusted-ca-bundleconfig map that merges these contents with the Red Hat Enterprise Linux CoreOS (RHCOS) trust bundle, and this config map is referenced in thetrustedCAfield of theProxyobject. TheadditionalTrustBundlefield 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
Proxyobject to reference theuser-ca-bundleconfig map in thetrustedCAfield. The allowed values areProxyonlyandAlways. UseProxyonlyto reference theuser-ca-bundleconfig map only whenhttp/httpsproxy is configured. UseAlwaysto always reference theuser-ca-bundleconfig map. The default value isProxyonly.
NoteThe installation program does not support the proxy
readinessEndpointsfield.NoteIf the installer times out, restart and then complete the deployment by using the
wait-forcommand 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
- For more details about Accelerated Networking, see Accelerated Networking for Microsoft Azure VMs.
9.9. 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.
- You have an Azure subscription ID and tenant ID.
- If you are installing the cluster using a service principal, you have its application ID and password.
- If you are installing the cluster using a system-assigned managed identity, you have enabled it on the virtual machine that you will run the installation program from.
If you are installing the cluster using a user-assigned managed identity, you have met these prerequisites:
- You have its client ID.
- You have assigned it to the virtual machine that you will run the installation program from.
Procedure
Optional: If you have run the installation program on this computer before, and want to use an alternative service principal or managed identity, go to the
~/.azure/directory and delete theosServicePrincipal.jsonconfiguration file.Deleting this file prevents the installation program from automatically reusing subscription and authentication values from a previous installation.
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
If the installation program cannot locate the
osServicePrincipal.jsonconfiguration file from a previous installation, you are prompted for Azure subscription and authentication values.Enter the following Azure parameter values for your subscription:
- azure subscription id: Enter the subscription ID to use for the cluster.
- azure tenant id: Enter the tenant ID.
Depending on the Azure identity you are using to deploy the cluster, do one of the following when prompted for the azure service principal client id:
- If you are using a service principal, enter its application ID.
- If you are using a system-assigned managed identity, leave this value blank.
- If you are using a user-assigned managed identity, specify its client ID.
Depending on the Azure identity you are using to deploy the cluster, do one of the following when prompted for the azure service principal client secret:
- If you are using a service principal, enter its password.
- If you are using a system-assigned managed identity, leave this value blank.
- If you are using a user-assigned managed identity,leave this value blank.
If previously not detected, the installation program creates an osServicePrincipal.json configuration file and stores this file in the ~/.azure/ directory on your computer. This ensures that the installation program can load the profile when it is creating an OpenShift Container Platform cluster on the target platform.
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
kubeadminuser. -
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-bootstrappercertificate 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.
9.10. Installing the OpenShift CLI
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 4.16. 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 v4.16 Linux Client entry and save the file.
Unpack the archive:
$ tar xvf <file>
Place the
ocbinary in a directory that is on yourPATH.To check your
PATH, execute the following command:$ echo $PATH
Verification
After you install the OpenShift CLI, it is available using the
occommand:$ 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 v4.16 Windows Client entry and save the file.
- Unzip the archive with a ZIP program.
Move the
ocbinary 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
occommand: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 v4.16 macOS Client entry and save the file.
NoteFor macOS arm64, choose the OpenShift v4.16 macOS arm64 Client entry.
- Unpack and unzip the archive.
Move the
ocbinary to a directory on your PATH.To check your
PATH, open a terminal and execute the following command:$ echo $PATH
Verification
Verify your installation by using an
occommand:$ oc <command>
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
ocCLI.
Procedure
Export the
kubeadmincredentials:$ 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
occommands successfully using the exported configuration:$ oc whoami
Example output
system:admin
Additional resources
- See Accessing the web console for more details about accessing and understanding the OpenShift Container Platform web console.
9.12. Telemetry access for OpenShift Container Platform
In OpenShift Container Platform 4.16, 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
- See About remote health monitoring for more information about the Telemetry service
9.13. Next steps
- Customize your cluster.
- If necessary, you can opt out of remote health reporting.
