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Installation configuration parameters for IBM Z and IBM LinuxONE - Installing on IBM Z and IBM LinuxONE | Installing | OpenShift Container Platform 4.16
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Installation configuration parameters for IBM Z and IBM LinuxONE

Before you deploy an OpenShift Container Platform cluster, you provide a customized install-config.yaml installation configuration file that describes the details for your environment.

While this document refers only to IBM Z®, all information in it also applies to IBM® LinuxONE.

Available installation configuration parameters for IBM Z

The following tables specify the required, optional, and IBM Z-specific installation configuration parameters that you can set as part of the installation process.

After installation, you cannot modify these parameters in the install-config.yaml file.

Required configuration parameters

Required installation configuration parameters are described in the following table:

Table 1. Required parameters
Parameter Description Values 
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.

Object

 
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: aws, baremetal, azure, gcp, ibmcloud, nutanix, openstack, powervs, vsphere, or {}. For additional information about platform.<platform> parameters, consult the table for your specific platform that follows.

Object

 
pullSecret:

Get a pull secret from 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"
      }
   }
}

Network configuration parameters

You can customize your installation configuration based on the requirements of your existing network infrastructure. For example, you can expand the IP address block for the cluster network or provide different IP address blocks than the defaults.

Consider the following information before you configure network parameters for your cluster:

  • If you use the Red Hat OpenShift Networking OVN-Kubernetes network plugin, both IPv4 and IPv6 address families are supported.

  • If you deployed nodes in an OpenShift Container Platform cluster with a network that supports both IPv4 and non-link-local IPv6 addresses, configure your cluster to use a dual-stack network.

    • For clusters configured for dual-stack networking, both IPv4 and IPv6 traffic must use the same network interface as the default gateway. This ensures that in a multiple network interface controller (NIC) environment, a cluster can detect what NIC to use based on the available network interface. For more information, see "OVN-Kubernetes IPv6 and dual-stack limitations" in About the OVN-Kubernetes network plugin.

    • To prevent network connectivity issues, do not install a single-stack IPv4 cluster on a host that supports dual-stack networking.

If you configure your cluster to use both IP address families, review the following requirements:

  • Both IP families must use the same network interface for the default gateway.

  • Both IP families must have the default gateway.

  • You must specify IPv4 and IPv6 addresses in the same order for all network configuration parameters. For example, in the following configuration IPv4 addresses are listed before IPv6 addresses.

    networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  - cidr: fd00:10:128::/56
    hostPrefix: 64
  serviceNetwork:
  - 172.30.0.0/16
  - fd00:172:16::/112
Table 2. Network parameters
Parameter Description Values 
networking:

The configuration for the cluster network.

Object

You cannot modify parameters specified by the networking object after installation.

 
networking:
  networkType:

The Red Hat OpenShift Networking network plugin to install.

OVNKubernetes. 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 OVN-Kubernetes network plugins supports 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.

If you specify multiple IP kernel arguments, the machineNetwork.cidr value must be the CIDR of the primary network.

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 and IBM Power® Virtual Server. For libvirt, the default value is 192.168.126.0/24. For IBM Power® Virtual Server, the default value is 192.168.0.0/24.

An IP network block in CIDR notation.

For example, 10.0.0.0/16.

Set the networking.machineNetwork to match the CIDR that the preferred NIC resides in.

Optional configuration parameters

Optional installation configuration parameters are described in the following table:

Table 3. Optional parameters
Parameter Description Values 
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

 
cpuPartitioningMode:

Enables workload partitioning, which isolates OpenShift Container Platform services, cluster management workloads, and infrastructure pods to run on a reserved set of CPUs. Workload partitioning can only be enabled during installation and cannot be disabled after installation. While this field enables workload partitioning, it does not configure workloads to use specific CPUs. For more information, see the Workload partitioning page in the Scalability and Performance section.

None or AllNodes. None is the default value.

 
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, heteregeneous clusters are not supported, so all pools must specify the same architecture. Valid values are s390x (the default).

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.

If you disable simultaneous multithreading, ensure that your capacity planning accounts for the dramatically decreased machine performance.

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.

aws, azure, gcp, ibmcloud, nutanix, openstack, powervs, 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, heterogeneous clusters are not supported, so all pools must specify the same architecture. Valid values are s390x (the default).

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.

If you disable simultaneous multithreading, ensure that your capacity planning accounts for the dramatically decreased machine performance.

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.

aws, azure, gcp, ibmcloud, nutanix, openstack, powervs, vsphere, or {}

 
controlPlane:
  replicas:

The number of control plane machines to provision.

Supported values are 3, or 1 when deploying single-node OpenShift.

 
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.

Not all CCO modes are supported for all cloud providers. For more information about CCO modes, see the "Managing cloud provider credentials" entry in the Authentication and authorization content.

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.

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.

If you are using Azure File storage, you cannot enable fips mode.

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. The default value is External.

Setting this field to Internal is not supported on non-cloud platforms.

If the value of the field is set to Internal, the cluster will become non-functional. For more information, refer to BZ#1953035.

 
sshKey:

The SSH key to authenticate access to your cluster machines.

For 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.

For example, sshKey: ssh-ed25519 AAAA...