Installation configuration parameters for the Agent-based Installer - Installing an on-premise cluster with the Agent-based Installer | Installing

Available installation configuration parameters
Available Agent configuration parameters
- Required configuration parameters
- Optional configuration parameters

Before you deploy an OpenShift Container Platform cluster using the Agent-based Installer, you provide parameters to customize your cluster and the platform that hosts it. When you create the install-config.yaml and agent-config.yaml files, you must provide values for the required parameters, and you can use the optional parameters to customize your cluster further.

Available installation configuration parameters

The following tables specify the required and optional installation configuration parameters that you can set as part of the Agent-based installation process.

These values are specified in the install-config.yaml file.

These settings are used for installation only, and cannot be modified after installation.

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}}`. When you do not provide `metadata.name` through either the `install-config.yaml` or `agent-config.yaml` files, for example when you use only ZTP manifests, the cluster name is set to `agent-cluster`.	String of lowercase letters, hyphens (`-`), and periods (`.`), such as `dev`.
platform:	The configuration for the specific platform upon which to perform the installation: `baremetal`, `external`, `none`, or `vsphere`.	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.

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

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

Globalnet is not supported with Red Hat OpenShift Data Foundation disaster recovery solutions. For regional disaster recovery scenarios, ensure that you use a nonoverlapping range of private IP addresses for the cluster and service networks in each cluster.

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.

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
  - cidr: fd01::/48
    hostPrefix: 64

networking:
  clusterNetwork:
    cidr:

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

If you use the OpenShift SDN network plugin, specify an IPv4 network. If you use the OVN-Kubernetes network plugin, you can specify IPv4 and IPv6 networks.

An IP address block in Classless Inter-Domain Routing (CIDR) notation. The prefix length for an IPv4 block is between 0 and 32. The prefix length for an IPv6 block is between 0 and 128. For example, 10.128.0.0/14 or fd01::/48.

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.

For an IPv4 network the default value is 23. For an IPv6 network the default value is 64. The default value is also the minimum value for IPv6.

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.

If you use the OVN-Kubernetes network plugin, you can specify an IP address block for both of the IPv4 and IPv6 address families.

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

networking:
  serviceNetwork:
   - 172.30.0.0/16
   - fd02::/112

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 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 or fd00::/48.

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:

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, clusters with varied architectures are not supported. All pools must specify the same architecture. Valid values are amd64 and arm64.

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.

baremetal, 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:

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.

baremetal, 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.

Mint, Passthrough, Manual or an empty string (""). ^[1]

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 Installing the system in 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...

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.

Available Agent configuration parameters

The following tables specify the required and optional Agent configuration parameters that you can set as part of the Agent-based installation process.

These values are specified in the agent-config.yaml file.

These settings are used for installation only, and cannot be modified after installation.

Required configuration parameters

Required Agent configuration parameters are described in the following table:

Table 4. Required parameters
Parameter	Description	Values
apiVersion:	The API version for the `agent-config.yaml` content. The current version is `v1beta1`. The installation program might also support older API versions.	String
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}}`. The value entered in the `agent-config.yaml` file is ignored, and instead the value specified in the `install-config.yaml` file is used. When you do not provide `metadata.name` through either the `install-config.yaml` or `agent-config.yaml` files, for example when you use only ZTP manifests, the cluster name is set to `agent-cluster`.	String of lowercase letters and hyphens (`-`), such as `dev`.

Optional configuration parameters

Optional Agent configuration parameters are described in the following table:

Table 5. Optional parameters
Parameter	Description	Values
rendezvousIP:	The IP address of the node that performs the bootstrapping process as well as running the `assisted-service` component. You must provide the rendezvous IP address when you do not specify at least one host’s IP address in the `networkConfig` parameter. If this address is not provided, one IP address is selected from the provided hosts' `networkConfig`.	IPv4 or IPv6 address.
bootArtifactsBaseURL:	The URL of the server to upload Preboot Execution Environment (PXE) assets to when using the Agent-based Installer to generate an iPXE script. For more information, see "Preparing PXE assets for OpenShift Container Platform".	String.
additionalNTPSources:	A list of Network Time Protocol (NTP) sources to be added to all cluster hosts, which are added to any NTP sources that are configured through other means.	List of hostnames or IP addresses.
hosts:	Host configuration. An optional list of hosts. The number of hosts defined must not exceed the total number of hosts defined in the `install-config.yaml` file, which is the sum of the values of the `compute.replicas` and `controlPlane.replicas` parameters.	An array of host configuration objects.
hosts: hostname:	Hostname. Overrides the hostname obtained from either the Dynamic Host Configuration Protocol (DHCP) or a reverse DNS lookup. Each host must have a unique hostname supplied by one of these methods, although configuring a hostname through this parameter is optional.	String.
hosts: interfaces:	Provides a table of the name and MAC address mappings for the interfaces on the host. If a `NetworkConfig` section is provided in the `agent-config.yaml` file, this table must be included and the values must match the mappings provided in the `NetworkConfig` section.	An array of host configuration objects.
hosts: interfaces: name:	The name of an interface on the host.	String.
hosts: interfaces: macAddress:	The MAC address of an interface on the host.	A MAC address such as the following example: `00-B0-D0-63-C2-26`.
hosts: role:	Defines whether the host is a `master` or `worker` node. If no role is defined in the `agent-config.yaml` file, roles will be assigned at random during cluster installation.	`master` or `worker`.
hosts: rootDeviceHints:	Enables provisioning of the Red Hat Enterprise Linux CoreOS (RHCOS) image to a particular device. The installation program examines the devices in the order it discovers them, and compares the discovered values with the hint values. It uses the first discovered device that matches the hint value. This is the device that the operating system is written on during installation.	A dictionary of key-value pairs. For more information, see "Root device hints" in the "Setting up the environment for an OpenShift installation" page.
hosts: rootDeviceHints: deviceName:	The name of the device the RHCOS image is provisioned to.	String.
hosts: networkConfig:	The host network definition. The configuration must match the Host Network Management API defined in the nmstate documentation.	A dictionary of host network configuration objects.

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