7.6. Installing a cluster on Azure with customizations

apiVersion

The API version for the install-config.yaml content. The current version is v1. The installation program may also support older API versions.

String

baseDomain

The base domain of your cloud provider. The base domain is used to create routes to your OpenShift Container Platform cluster components. The full DNS name for your cluster is a combination of the baseDomain and metadata.name parameter values that uses the <metadata.name>.<baseDomain> format.

A fully-qualified domain or subdomain name, such as example.com.

metadata

Kubernetes resource ObjectMeta, from which only the name parameter is consumed.

Objet

metadata.name

The name of the cluster. DNS records for the cluster are all subdomains of {{.metadata.name}}.{{.baseDomain}}.

String of lowercase letters, hyphens (-), and periods (.), such as dev.

platform

The configuration for the specific platform upon which to perform the installation: alibabacloud, aws, baremetal, azure, gcp, ibmcloud, nutanix, openstack, ovirt, vsphere, or {}. For additional information about platform.<platform> parameters, consult the table for your specific platform that follows.

Objet

pullSecret

Get a pull secret from the Red Hat OpenShift Cluster Manager to authenticate downloading container images for OpenShift Container Platform components from services such as Quay.io.

{
   "auths":{
      "cloud.openshift.com":{
         "auth":"b3Blb=",
         "email":"you@example.com"
      },
      "quay.io":{
         "auth":"b3Blb=",
         "email":"you@example.com"
      }
   }
}

networking

The configuration for the cluster network.

Objet

networking.networkType

The Red Hat OpenShift Networking network plugin to install.

Either OpenShiftSDN or OVNKubernetes. OpenShiftSDN is a CNI plugin for all-Linux networks. OVNKubernetes is a CNI plugin for Linux networks and hybrid networks that contain both Linux and Windows servers. The default value is OVNKubernetes.

networking.clusterNetwork

The IP address blocks for pods.

The default value is 10.128.0.0/14 with a host prefix of /23.

If you specify multiple IP address blocks, the blocks must not overlap.

An array of objects. For example:

networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23

networking.clusterNetwork.cidr

Required if you use networking.clusterNetwork. An IP address block.

An IPv4 network.

An IP address block in Classless Inter-Domain Routing (CIDR) notation. The prefix length for an IPv4 block is between 0 and 32.

networking.clusterNetwork.hostPrefix

The subnet prefix length to assign to each individual node. For example, if hostPrefix is set to 23 then each node is assigned a /23 subnet out of the given cidr. A hostPrefix value of 23 provides 510 (2^(32 - 23) - 2) pod IP addresses.

A subnet prefix.

The default value is 23.

networking.serviceNetwork

The IP address block for services. The default value is 172.30.0.0/16.

The OpenShift SDN and OVN-Kubernetes network plugins support only a single IP address block for the service network.

An array with an IP address block in CIDR format. For example:

networking:
  serviceNetwork:
   - 172.30.0.0/16

networking.machineNetwork

The IP address blocks for machines.

If you specify multiple IP address blocks, the blocks must not overlap.

An array of objects. For example:

networking:
  machineNetwork:
  - cidr: 10.0.0.0/16

networking.machineNetwork.cidr

Required if you use networking.machineNetwork. An IP address block. The default value is 10.0.0.0/16 for all platforms other than libvirt. For libvirt, the default value is 192.168.126.0/24.

An IP network block in CIDR notation.

For example, 10.0.0.0/16.

additionalTrustBundle

A PEM-encoded X.509 certificate bundle that is added to the nodes' trusted certificate store. This trust bundle may also be used when a proxy has been configured.

String

capabilities

Controls the installation of optional core cluster components. You can reduce the footprint of your OpenShift Container Platform cluster by disabling optional components. For more information, see the "Cluster capabilities" page in Installing.

String array

capabilities.baselineCapabilitySet

Selects an initial set of optional capabilities to enable. Valid values are None, v4.11, v4.12 and vCurrent. The default value is vCurrent.

String

capabilities.additionalEnabledCapabilities

Extends the set of optional capabilities beyond what you specify in baselineCapabilitySet. You may specify multiple capabilities in this parameter.

String array

compute

The configuration for the machines that comprise the compute nodes.

Array of MachinePool objects.

compute.architecture

Determines the instruction set architecture of the machines in the pool. Currently, clusters with varied architectures are not supported. All pools must specify the same architecture. Valid values are amd64 and arm64. See Supported installation methods for different platforms in Installing documentation for information about instance availability.

String

compute.hyperthreading

Whether to enable or disable simultaneous multithreading, or hyperthreading, on compute machines. By default, simultaneous multithreading is enabled to increase the performance of your machines' cores.

Enabled or Disabled

compute.name

Required if you use compute. The name of the machine pool.

worker

compute.platform

Required if you use compute. Use this parameter to specify the cloud provider to host the worker machines. This parameter value must match the controlPlane.platform parameter value.

alibabacloud, aws, azure, gcp, ibmcloud, nutanix, openstack, ovirt, vsphere, or {}

compute.replicas

The number of compute machines, which are also known as worker machines, to provision.

A positive integer greater than or equal to 2. The default value is 3.

featureSet

Enables the cluster for a feature set. A feature set is a collection of OpenShift Container Platform features that are not enabled by default. For more information about enabling a feature set during installation, see "Enabling features using feature gates".

String. The name of the feature set to enable, such as TechPreviewNoUpgrade.

controlPlane

The configuration for the machines that comprise the control plane.

Array of MachinePool objects.

controlPlane.architecture

Determines the instruction set architecture of the machines in the pool. Currently, clusters with varied architectures are not supported. All pools must specify the same architecture. Valid values are amd64 and arm64. See Supported installation methods for different platforms in Installing documentation for information about instance availability.

String

controlPlane.hyperthreading

Whether to enable or disable simultaneous multithreading, or hyperthreading, on control plane machines. By default, simultaneous multithreading is enabled to increase the performance of your machines' cores.

Enabled or Disabled

controlPlane.name

Required if you use controlPlane. The name of the machine pool.

master

controlPlane.platform

Required if you use controlPlane. Use this parameter to specify the cloud provider that hosts the control plane machines. This parameter value must match the compute.platform parameter value.

alibabacloud, aws, azure, gcp, ibmcloud, nutanix, openstack, ovirt, vsphere, or {}

controlPlane.replicas

The number of control plane machines to provision.

The only supported value is 3, which is the default value.

credentialsMode

The Cloud Credential Operator (CCO) mode. If no mode is specified, the CCO dynamically tries to determine the capabilities of the provided credentials, with a preference for mint mode on the platforms where multiple modes are supported.

Mint, Passthrough, Manual or an empty string ("").

fips

Enable or disable FIPS mode. The default is false (disabled). 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.

false or true

imageContentSources

Sources and repositories for the release-image content.

Array of objects. Includes a source and, optionally, mirrors, as described in the following rows of this table.

imageContentSources.source

Required if you use imageContentSources. Specify the repository that users refer to, for example, in image pull specifications.

String

imageContentSources.mirrors

Specify one or more repositories that may also contain the same images.

Array of strings

publish

How to publish or expose the user-facing endpoints of your cluster, such as the Kubernetes API, OpenShift routes.

Internal or External. To deploy a private cluster, which cannot be accessed from the internet, set publish to Internal. The default value is External.

sshKey

The SSH key or keys to authenticate access your cluster machines.

One or more keys. For example:

sshKey:
  <key1>
  <key2>
  <key3>

compute.platform.azure.encryptionAtHost

Enables host-level encryption for compute machines. You can enable this encryption alongside user-managed server-side encryption. This feature encrypts temporary, ephemeral, cached and un-managed disks on the VM host. This is not a prerequisite for user-managed server-side encryption.

true or false. The default is false.

compute.platform.azure.osDisk.diskSizeGB

The Azure disk size for the VM.

Integer that represents the size of the disk in GB. The default is 128.

compute.platform.azure.osDisk.diskType

Defines the type of disk.

standard_LRS, premium_LRS, or standardSSD_LRS. The default is premium_LRS.

compute.platform.azure.ultraSSDCapability

Enables the use of Azure ultra disks for persistent storage on compute nodes. This requires that your Azure region and zone have ultra disks available.

Enabled, Disabled. The default is Disabled.

compute.platform.azure.osDisk.diskEncryptionSet.resourceGroup

The name of the Azure resource group that contains the disk encryption set from the installation prerequisites. This resource group should be different from the resource group where you install the cluster to avoid deleting your Azure encryption key when the cluster is destroyed. This value is only necessary if you intend to install the cluster with user-managed disk encryption.

String, for example production_encryption_resource_group.

compute.platform.azure.osDisk.diskEncryptionSet.name

The name of the disk encryption set that contains the encryption key from the installation prerequisites.

String, for example production_disk_encryption_set.

compute.platform.azure.osDisk.diskEncryptionSet.subscriptionId

Optional. The ID of a disk encryption set in another Azure subscription. This secondary disk encryption set will be used to encrypt compute machines. By default, the installation program will use the disk encryption set from the Azure subscription ID that you provided to the installation program prompts.

String, in the format 00000000-0000-0000-0000-000000000000.

controlPlane.platform.azure.encryptionAtHost

Enables host-level encryption for control plane machines. You can enable this encryption alongside user-managed server-side encryption. This feature encrypts temporary, ephemeral, cached and un-managed disks on the VM host. This is not a prerequisite for user-managed server-side encryption.

true or false. The default is false.

controlPlane.platform.azure.osDisk.diskEncryptionSet.resourceGroup

The name of the Azure resource group that contains the disk encryption set from the installation prerequisites. This resource group should be different from the resource group where you install the cluster to avoid deleting your Azure encryption key when the cluster is destroyed. This value is only necessary if you intend to install the cluster with user-managed disk encryption.

String, for example production_encryption_resource_group.

controlPlane.platform.azure.osDisk.diskEncryptionSet.name

The name of the disk encryption set that contains the encryption key from the installation prerequisites.

String, for example production_disk_encryption_set.

controlPlane.platform.azure.osDisk.diskEncryptionSet.subscriptionId

Optional. The ID of a disk encryption set in another Azure subscription. This secondary disk encryption set will be used to encrypt control plane machines. By default, the installation program will use the disk encryption set from the Azure subscription ID that you provided to the installation program prompts.

String, in the format 00000000-0000-0000-0000-000000000000.

controlPlane.platform.azure.osDisk.diskSizeGB

The Azure disk size for the VM.

Integer that represents the size of the disk in GB. The default is 1024.

controlPlane.platform.azure.osDisk.diskType

Defines the type of disk.

premium_LRS or standardSSD_LRS. The default is premium_LRS.

controlPlane.platform.azure.ultraSSDCapability

Enables the use of Azure ultra disks for persistent storage on control plane machines. This requires that your Azure region and zone have ultra disks available.

Enabled, Disabled. The default is Disabled.

platform.azure.baseDomainResourceGroupName

The name of the resource group that contains the DNS zone for your base domain.

String, for example production_cluster.

platform.azure.resourceGroupName

The name of an already existing resource group to install your cluster to. This resource group must be empty and only used for this specific cluster; the cluster components assume ownership of all resources in the resource group. If you limit the service principal scope of the installation program to this resource group, you must ensure all other resources used by the installation program in your environment have the necessary permissions, such as the public DNS zone and virtual network. Destroying the cluster by using the installation program deletes this resource group.

String, for example existing_resource_group.

platform.azure.outboundType

The outbound routing strategy used to connect your cluster to the internet. If you are using user-defined routing, you must have pre-existing networking available where the outbound routing has already been configured prior to installing a cluster. The installation program is not responsible for configuring user-defined routing.

LoadBalancer or UserDefinedRouting. The default is LoadBalancer.

platform.azure.region

The name of the Azure region that hosts your cluster.

Any valid region name, such as centralus.

platform.azure.zone

List of availability zones to place machines in. For high availability, specify at least two zones.

List of zones, for example ["1", "2", "3"].

platform.azure.defaultMachinePlatform.ultraSSDCapability

Enables the use of Azure ultra disks for persistent storage on control plane and compute machines. This requires that your Azure region and zone have ultra disks available.

Enabled, Disabled. The default is Disabled.

platform.azure.networkResourceGroupName

The name of the resource group that contains the existing VNet that you want to deploy your cluster to. This name cannot be the same as the platform.azure.baseDomainResourceGroupName.

String.

platform.azure.virtualNetwork

The name of the existing VNet that you want to deploy your cluster to.

String.

platform.azure.controlPlaneSubnet

The name of the existing subnet in your VNet that you want to deploy your control plane machines to.

Valid CIDR, for example 10.0.0.0/16.

platform.azure.computeSubnet

The name of the existing subnet in your VNet that you want to deploy your compute machines to.

Valid CIDR, for example 10.0.0.0/16.

platform.azure.cloudName

The name of the Azure cloud environment that is used to configure the Azure SDK with the appropriate Azure API endpoints. If empty, the default value AzurePublicCloud is used.

Any valid cloud environment, such as AzurePublicCloud or AzureUSGovernmentCloud.