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Installing a cluster with network customizations - Installing on vSphere | Installing | OpenShift Container Platform 4.16
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Installing a cluster on vSphere with network customizations

In OpenShift Container Platform version 4.16, you can install a cluster on VMware vSphere infrastructure that you provision with customized network configuration options. By customizing your network configuration, your cluster can coexist with existing IP address allocations in your environment and integrate with existing MTU and VXLAN configurations.

OpenShift Container Platform supports deploying a cluster to a single VMware vCenter only. Deploying a cluster with machines/machine sets on multiple vCenters is not supported.

You must set most of the network configuration parameters during installation, and you can modify only kubeProxy configuration parameters in a running cluster.

The steps for performing a user-provisioned infrastructure installation are provided as an example only. Installing a cluster with infrastructure you provide requires knowledge of the vSphere platform and the installation process of OpenShift Container Platform. Use the user-provisioned infrastructure installation instructions as a guide; you are free to create the required resources through other methods.

Prerequisites

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.

VMware vSphere region and zone enablement

You can deploy an OpenShift Container Platform cluster to multiple vSphere data centers that run in a single VMware vCenter. Each data center can run multiple clusters. This configuration reduces the risk of a hardware failure or network outage that can cause your cluster to fail. To enable regions and zones, you must define multiple failure domains for your OpenShift Container Platform cluster.

The VMware vSphere region and zone enablement feature requires the vSphere Container Storage Interface (CSI) driver as the default storage driver in the cluster. As a result, the feature is only available on a newly installed cluster.

For a cluster that was upgraded from a previous release, you must enable CSI automatic migration for the cluster. You can then configure multiple regions and zones for the upgraded cluster.

The default installation configuration deploys a cluster to a single vSphere data center. If you want to deploy a cluster to multiple vSphere data centers, you must create an installation configuration file that enables the region and zone feature.

The default install-config.yaml file includes vcenters and failureDomains fields, where you can specify multiple vSphere data centers and clusters for your OpenShift Container Platform cluster. You can leave these fields blank if you want to install an OpenShift Container Platform cluster in a vSphere environment that consists of single data center.

The following list describes terms associated with defining zones and regions for your cluster:

  • Failure domain: Establishes the relationships between a region and zone. You define a failure domain by using vCenter objects, such as a datastore object. A failure domain defines the vCenter location for OpenShift Container Platform cluster nodes.

  • Region: Specifies a vCenter data center. You define a region by using a tag from the openshift-region tag category.

  • Zone: Specifies a vCenter cluster. You define a zone by using a tag from the openshift-zone tag category.

If you plan on specifying more than one failure domain in your install-config.yaml file, you must create tag categories, zone tags, and region tags in advance of creating the configuration file.

You must create a vCenter tag for each vCenter data center, which represents a region. Additionally, you must create a vCenter tag for each cluster than runs in a data center, which represents a zone. After you create the tags, you must attach each tag to their respective data centers and clusters.

The following table outlines an example of the relationship among regions, zones, and tags for a configuration with multiple vSphere data centers running in a single VMware vCenter.

Data center (region) Cluster (zone) Tags

us-east

us-east-1

us-east-1a

us-east-1b

us-east-2

us-east-2a

us-east-2b

us-west

us-west-1

us-west-1a

us-west-1b

us-west-2

us-west-2a

us-west-2b
Additional resources

Manually creating the installation configuration file

Installing the cluster requires that you manually create the installation configuration file.

The Cloud Controller Manager Operator performs a connectivity check on a provided hostname or IP address. Ensure that you specify a hostname or an IP address to a reachable vCenter server. If you provide metadata to a non-existent vCenter server, installation of the cluster fails at the bootstrap stage.
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

  1. Create an installation directory to store your required installation assets in:

    $ mkdir <installation_directory>

    You 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.

  2. Customize the sample install-config.yaml file template that is provided and save it in the <installation_directory>.

    You must name this configuration file install-config.yaml.

  3. Back up the install-config.yaml file so that you can use it to install multiple clusters.

    The install-config.yaml file is consumed during the next step of the installation process. You must back it up now.
Additional resources

Sample install-config.yaml file for VMware vSphere

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.

additionalTrustBundlePolicy: Proxyonly
apiVersion: v1
baseDomain: example.com (1)
compute: (2)
- architecture: amd64
  name: <worker_node>
  platform: {}
  replicas: 0 (3)
controlPlane: (2)
  architecture: amd64
  name: <parent_node>
  platform: {}
  replicas: 3 (4)
metadata:
  creationTimestamp: null
  name: test (5)
networking:
---
platform:
  vsphere:
    failureDomains: (6)
    - name: <failure_domain_name>
      region: <default_region_name>
      server: <fully_qualified_domain_name>
      topology:
        computeCluster: "/<data_center>/host/<cluster>"
        datacenter: <data_center> (7)
        datastore: "/<data_center>/datastore/<datastore>" (8)
        networks:
        - <VM_Network_name>
        resourcePool: "/<data_center>/host/<cluster>/Resources/<resourcePool>" (9)
        folder: "/<data_center_name>/vm/<folder_name>/<subfolder_name>" (10)
      zone: <default_zone_name>
    vcenters:
    - datacenters:
      - <data_center>
      password: <password> (11)
      port: 443
      server: <fully_qualified_domain_name> (12)
      user: administrator@vsphere.local
    diskType: thin (13)
fips: false (14)
pullSecret: '{"auths": ...}' (15)
sshKey: 'ssh-ed25519 AAAA...' (16)
1 The base domain of the cluster. All DNS records must be sub-domains of this base and include the cluster name.
2 The controlPlane section is a single mapping, but the compute section is a sequence of mappings. To meet the requirements of the different data structures, the first line of the compute section must begin with a hyphen, -, and the first line of the controlPlane section must not. Both sections define a single machine pool, so only one control plane is used. OpenShift Container Platform does not support defining multiple compute pools.
3 You must set the value of the replicas parameter to 0. This parameter controls the number of workers that the cluster creates and manages for you, which are functions that the cluster does not perform when you use user-provisioned infrastructure. You must manually deploy worker machines for the cluster to use before you finish installing OpenShift Container Platform.
4 The number of control plane machines that you add to the cluster. Because the cluster uses this values as the number of etcd endpoints in the cluster, the value must match the number of control plane machines that you deploy.
5 The cluster name that you specified in your DNS records.
6 Establishes the relationships between a region and zone. You define a failure domain by using vCenter objects, such as a datastore object. A failure domain defines the vCenter location for OpenShift Container Platform cluster nodes.
7 The vSphere data center.
8 The path to the vSphere datastore that holds virtual machine files, templates, and ISO images.

You can specify the path of any datastore that exists in a datastore cluster. By default, Storage vMotion is automatically enabled for a datastore cluster. Red Hat does not support Storage vMotion, so you must disable Storage vMotion to avoid data loss issues for your OpenShift Container Platform cluster.

If you must specify VMs across multiple datastores, use a datastore object to specify a failure domain in your cluster’s install-config.yaml configuration file. For more information, see "VMware vSphere region and zone enablement".
9 Optional: For installer-provisioned infrastructure, the absolute path of an existing resource pool where the installation program creates the virtual machines, for example, /<data_center_name>/host/<cluster_name>/Resources/<resource_pool_name>/<optional_nested_resource_pool_name>. If you do not specify a value, resources are installed in the root of the cluster /example_data_center/host/example_cluster/Resources.
10 Optional: For installer-provisioned infrastructure, the absolute path of an existing folder where the installation program creates the virtual machines, for example, /<data_center_name>/vm/<folder_name>/<subfolder_name>. If you do not provide this value, the installation program creates a top-level folder in the data center virtual machine folder that is named with the infrastructure ID. If you are providing the infrastructure for the cluster and you do not want to use the default StorageClass object, named thin, you can omit the folder parameter from the install-config.yaml file.
11 The password associated with the vSphere user.
12 The fully-qualified hostname or IP address of the vCenter server.

The Cloud Controller Manager Operator performs a connectivity check on a provided hostname or IP address. Ensure that you specify a hostname or an IP address to a reachable vCenter server. If you provide metadata to a non-existent vCenter server, installation of the cluster fails at the bootstrap stage.
13 The vSphere disk provisioning method.
14 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.

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.
15 The pull secret that you obtained from 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.
16 The public portion of the default SSH key for the core user in Red Hat Enterprise Linux CoreOS (RHCOS).

Configuring the cluster-wide proxy during installation

Production environments can deny direct access to the internet and instead have an HTTP or HTTPS proxy available. You can configure a new OpenShift Container Platform cluster to use a proxy by configuring the proxy settings in the install-config.yaml file.

Prerequisites

  • You have an existing install-config.yaml file.

  • You reviewed the sites that your cluster requires access to and determined whether any of them need to bypass the proxy. By default, all cluster egress traffic is proxied, including calls to hosting cloud provider APIs. You added sites to the Proxy object’s spec.noProxy field to bypass the proxy if necessary.

    The Proxy object status.noProxy field is populated with the values of the networking.machineNetwork[].cidr, networking.clusterNetwork[].cidr, and networking.serviceNetwork[] fields from your installation configuration.

    For installations on Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, and Red Hat OpenStack Platform (RHOSP), the Proxy object status.noProxy field is also populated with the instance metadata endpoint (169.254.169.254).
Procedure

  1. Edit your install-config.yaml file and add the proxy settings. For example:

    apiVersion: v1
baseDomain: my.domain.com
proxy:
  httpProxy: http://<username>:<pswd>@<ip>:<port> (1)
  httpsProxy: https://<username>:<pswd>@<ip>:<port> (2)
  noProxy: example.com (3)
additionalTrustBundle: | (4)
    -----BEGIN CERTIFICATE-----
    <MY_TRUSTED_CA_CERT>
    -----END CERTIFICATE-----
additionalTrustBundlePolicy: <policy_to_add_additionalTrustBundle> (5)
    1 A proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be http.
    2 A proxy URL to use for creating HTTPS connections outside the cluster.
    3 A comma-separated list of destination domain names, IP addresses, or other network CIDRs to exclude from proxying. Preface a domain with . to match subdomains only. For example, .y.com matches x.y.com, but not y.com. Use * to bypass the proxy for all destinations. You must include vCenter’s IP address and the IP range that you use for its machines.
    4 If provided, the installation program generates a config map that is named user-ca-bundle in the openshift-config namespace that contains one or more additional CA certificates that are required for proxying HTTPS connections. The Cluster Network Operator then creates a trusted-ca-bundle config map that merges these contents with the Red Hat Enterprise Linux CoreOS (RHCOS) trust bundle, and this config map is referenced in the trustedCA field of the Proxy object. The additionalTrustBundle field is required unless the proxy’s identity certificate is signed by an authority from the RHCOS trust bundle.
    5 Optional: The policy to determine the configuration of the Proxy object to reference the user-ca-bundle config map in the trustedCA field. The allowed values are Proxyonly and Always. Use Proxyonly to reference the user-ca-bundle config map only when http/https proxy is configured. Use Always to always reference the user-ca-bundle config map. The default value is Proxyonly.

    The installation program does not support the proxy readinessEndpoints field.

    If the installer times out, restart and then complete the deployment by using the wait-for command of the installer. For example:

    $ ./openshift-install wait-for install-complete --log-level debug

  2. 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.

Configuring regions and zones for a VMware vCenter

You can modify the default installation configuration file, so that you can deploy an OpenShift Container Platform cluster to multiple vSphere data centers that run in a single VMware vCenter.

The default install-config.yaml file configuration from the previous release of OpenShift Container Platform is deprecated. You can continue to use the deprecated default configuration, but the openshift-installer will prompt you with a warning message that indicates the use of deprecated fields in the configuration file.

The example uses the govc command. The govc command is an open source command available from VMware; it is not available from Red Hat. The Red Hat support team does not maintain the govc command. Instructions for downloading and installing govc are found on the VMware documentation website
Prerequisites

  • You have an existing install-config.yaml installation configuration file.

    You must specify at least one failure domain for your OpenShift Container Platform cluster, so that you can provision data center objects for your VMware vCenter server. Consider specifying multiple failure domains if you need to provision virtual machine nodes in different data centers, clusters, datastores, and other components. To enable regions and zones, you must define multiple failure domains for your OpenShift Container Platform cluster.
Procedure

  1. Enter the following govc command-line tool commands to create the openshift-region and openshift-zone vCenter tag categories:

    If you specify different names for the openshift-region and openshift-zone vCenter tag categories, the installation of the OpenShift Container Platform cluster fails.

    		 
    $ govc tags.category.create -d "OpenShift region" openshift-region
    $ govc tags.category.create -d "OpenShift zone" openshift-zone

  2. To create a region tag for each region vSphere data center where you want to deploy your cluster, enter the following command in your terminal:

    $ govc tags.create -c <region_tag_category> <region_tag>

  3. To create a zone tag for each vSphere cluster where you want to deploy your cluster, enter the following command:

    $ govc tags.create -c <zone_tag_category> <zone_tag>

  4. Attach region tags to each vCenter data center object by entering the following command:

    $ govc tags.attach -c <region_tag_category> <region_tag_1> /<data_center_1>

  5. Attach the zone tags to each vCenter data center object by entering the following command:

    $ govc tags.attach -c <zone_tag_category> <zone_tag_1> /<data_center_1>/host/vcs-mdcnc-workload-1

  6. Change to the directory that contains the installation program and initialize the cluster deployment according to your chosen installation requirements.

Sample install-config.yaml file with multiple data centers defined in a vSphere center
---
compute:
---
  vsphere:
      zones:
        - "<machine_pool_zone_1>"
        - "<machine_pool_zone_2>"
---
controlPlane:
---
vsphere:
      zones:
        - "<machine_pool_zone_1>"
        - "<machine_pool_zone_2>"
---
platform:
  vsphere:
    vcenters:
---
    datacenters:
      - <data_center_1_name>
      - <data_center_2_name>
    failureDomains:
    - name: <machine_pool_zone_1>
      region: <region_tag_1>
      zone: <zone_tag_1>
      server: <fully_qualified_domain_name>
      topology:
        datacenter: <data_center_1>
        computeCluster: "/<data_center_1>/host/<cluster1>"
        networks:
        - <VM_Network1_name>
        datastore: "/<data_center_1>/datastore/<datastore1>"
        resourcePool: "/<data_center_1>/host/<cluster1>/Resources/<resourcePool1>"
        folder: "/<data_center_1>/vm/<folder1>"
    - name: <machine_pool_zone_2>
      region: <region_tag_2>
      zone: <zone_tag_2>
      server: <fully_qualified_domain_name>
      topology:
        datacenter: <data_center_2>
        computeCluster: "/<data_center_2>/host/<cluster2>"
        networks:
        - <VM_Network2_name>
        datastore: "/<data_center_2>/datastore/<datastore2>"
        resourcePool: "/<data_center_2>/host/<cluster2>/Resources/<resourcePool2>"
        folder: "/<data_center_2>/vm/<folder2>"
---

Network configuration phases

There are two phases prior to OpenShift Container Platform installation where you can customize the network configuration.

Phase 1

You can customize the following network-related fields in the install-config.yaml file before you create the manifest files:

  • networking.networkType

  • networking.clusterNetwork

  • networking.serviceNetwork

  • networking.machineNetwork

    For more information, see "Installation configuration parameters".

    Set the networking.machineNetwork to match the Classless Inter-Domain Routing (CIDR) where the preferred subnet is located.

    The CIDR range 172.17.0.0/16 is reserved by libVirt. You cannot use any other CIDR range that overlaps with the 172.17.0.0/16 CIDR range for networks in your cluster.
Phase 2

After creating the manifest files by running openshift-install create manifests, you can define a customized Cluster Network Operator manifest with only the fields you want to modify. You can use the manifest to specify advanced network configuration.

During phase 2, you cannot override the values that you specified in phase 1 in the install-config.yaml file. However, you can customize the network plugin during phase 2.

Specifying advanced network configuration

You can use advanced network configuration for your network plugin to integrate your cluster into your existing network environment.

You can specify advanced network configuration only before you install the cluster.

Customizing your network configuration by modifying the OpenShift Container Platform manifest files created by the installation program is not supported. Applying a manifest file that you create, as in the following procedure, is supported.
Prerequisites

  • You have created the install-config.yaml file and completed any modifications to it.

Procedure

  1. Change to the directory that contains the installation program and create the manifests:

    $ ./openshift-install create manifests --dir <installation_directory> (1)
    1 <installation_directory> specifies the name of the directory that contains the install-config.yaml file for your cluster.

  2. Create a stub manifest file for the advanced network configuration that is named cluster-network-03-config.yml in the <installation_directory>/manifests/ directory:

    apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:

  3. Specify the advanced network configuration for your cluster in the cluster-network-03-config.yml file, such as in the following example:

    Enable IPsec for the OVN-Kubernetes network provider
    apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      ipsecConfig:
        mode: Full

  4. Optional: Back up the manifests/cluster-network-03-config.yml file. The installation program consumes the manifests/ directory when you create the Ignition config files.

  5. Remove the Kubernetes manifest files that define the control plane machines and compute machineSets:

    $ rm -f openshift/99_openshift-cluster-api_master-machines-*.yaml openshift/99_openshift-cluster-api_worker-machineset-*.yaml

    Because you create and manage these resources yourself, you do not have to initialize them.

    • You can preserve the MachineSet files to create compute machines by using the machine API, but you must update references to them to match your environment.

Specifying multiple subnets for your network

Before you install an OpenShift Container Platform cluster on a vSphere host, you can specify multiple subnets for a networking implementation so that the vSphere cloud controller manager (CCM) can select the appropriate subnet for a given networking situation. vSphere can use the subnet for managing pods and services on your cluster.

For this configuration, you must specify internal and external Classless Inter-Domain Routing (CIDR) implementations in the vSphere CCM configuration. Each CIDR implementation lists an IP address range that the CCM uses to decide what subnets interact with traffic from internal and external networks.

Failure to configure internal and external CIDR implementations in the vSphere CCM configuration can cause the vSphere CCM to select the wrong subnet. This situation causes the following error:

ERROR Bootstrap failed to complete: timed out waiting for the condition
ERROR Failed to wait for bootstrapping to complete. This error usually happens when there is a problem with control plane hosts that prevents the control plane operators from creating the control plane.

This configuration can cause new nodes that associate with a MachineSet object with a single subnet to become unusable as each new node receives the node.cloudprovider.kubernetes.io/uninitialized taint. These situations can cause communication issues with the Kubernetes API server that can cause installation of the cluster to fail.
Prerequisites

  • You created Kubernetes manifest files for your OpenShift Container Platform cluster.

Procedure

  1. From the directory where you store your OpenShift Container Platform cluster manifest files, open the manifests/cluster-infrastructure-02-config.yml manifest file.

  2. Add a nodeNetworking object to the file and specify internal and external network subnet CIDR implementations for the object.

    For most networking situations, consider setting the standard multiple-subnet configuration. This configuration requires that you set the same IP address ranges in the nodeNetworking.internal.networkSubnetCidr and nodeNetworking.external.networkSubnetCidr parameters.
    Example of a configured cluster-infrastructure-02-config.yml manifest file
    apiVersion: config.openshift.io/v1
kind: Infrastructure
metadata:
  name: cluster
spec:
  cloudConfig:
    key: config
    name: cloud-provider-config
  platformSpec:
    type: VSphere
    vsphere:
      failureDomains:
      - name: generated-failure-domain
      ...
       nodeNetworking:
         external:
           networkSubnetCidr:
           - <machine_network_cidr_ipv4>
           - <machine_network_cidr_ipv6>
         internal:
           networkSubnetCidr:
           - <machine_network_cidr_ipv4>
           - <machine_network_cidr_ipv6>
# ...
Additional resources

Cluster Network Operator configuration

The configuration for the cluster network is specified as part of the Cluster Network Operator (CNO) configuration and stored in a custom resource (CR) object that is named cluster. The CR specifies the fields for the Network API in the operator.openshift.io API group.

The CNO configuration inherits the following fields during cluster installation from the Network API in the Network.config.openshift.io API group:

clusterNetwork

IP address pools from which pod IP addresses are allocated.

serviceNetwork

IP address pool for services.

defaultNetwork.type

Cluster network plugin. OVNKubernetes is the only supported plugin during installation.

You can specify the cluster network plugin configuration for your cluster by setting the fields for the defaultNetwork object in the CNO object named cluster.

Cluster Network Operator configuration object

The fields for the Cluster Network Operator (CNO) are described in the following table:

Table 1. Cluster Network Operator configuration object
Field Type Description

metadata.name

string

The name of the CNO object. This name is always cluster.

spec.clusterNetwork

array

A list specifying the blocks of IP addresses from which pod IP addresses are allocated and the subnet prefix length assigned to each individual node in the cluster. For example:

spec:
  clusterNetwork:
  - cidr: 10.128.0.0/19
    hostPrefix: 23
  - cidr: 10.128.32.0/19
    hostPrefix: 23

spec.serviceNetwork

array

A block of IP addresses for services. The OpenShift SDN and OVN-Kubernetes network plugins support only a single IP address block for the service network. For example:

spec:
  serviceNetwork:
  - 172.30.0.0/14

You can customize this field only in the install-config.yaml file before you create the manifests. The value is read-only in the manifest file.

spec.defaultNetwork

object

Configures the network plugin for the cluster network.

spec.kubeProxyConfig

object

The fields for this object specify the kube-proxy configuration. If you are using the OVN-Kubernetes cluster network plugin, the kube-proxy configuration has no effect.

defaultNetwork object configuration

The values for the defaultNetwork object are defined in the following table:

Table 2. defaultNetwork object
Field Type Description

type

string

OVNKubernetes. The Red Hat OpenShift Networking network plugin is selected during installation. This value cannot be changed after cluster installation.

OpenShift Container Platform uses the OVN-Kubernetes network plugin by default. OpenShift SDN is no longer available as an installation choice for new clusters.

ovnKubernetesConfig

object

This object is only valid for the OVN-Kubernetes network plugin.
Configuration for the OVN-Kubernetes network plugin

The following table describes the configuration fields for the OVN-Kubernetes network plugin:

Table 3. ovnKubernetesConfig object
Field Type Description

mtu

integer

The maximum transmission unit (MTU) for the Geneve (Generic Network Virtualization Encapsulation) overlay network. This is detected automatically based on the MTU of the primary network interface. You do not normally need to override the detected MTU.

If the auto-detected value is not what you expect it to be, confirm that the MTU on the primary network interface on your nodes is correct. You cannot use this option to change the MTU value of the primary network interface on the nodes.

If your cluster requires different MTU values for different nodes, you must set this value to 100 less than the lowest MTU value in your cluster. For example, if some nodes in your cluster have an MTU of 9001, and some have an MTU of 1500, you must set this value to 1400.

genevePort

integer

The port to use for all Geneve packets. The default value is 6081. This value cannot be changed after cluster installation.

ipsecConfig

object

Specify a configuration object for customizing the IPsec configuration.

ipv4

object

Specifies a configuration object for IPv4 settings.

ipv6

object

Specifies a configuration object for IPv6 settings.

policyAuditConfig

object

Specify a configuration object for customizing network policy audit logging. If unset, the defaults audit log settings are used.

gatewayConfig

object

Optional: Specify a configuration object for customizing how egress traffic is sent to the node gateway.

While migrating egress traffic, you can expect some disruption to workloads and service traffic until the Cluster Network Operator (CNO) successfully rolls out the changes.
Table 4. ovnKubernetesConfig.ipv4 object
Field Type Description

internalTransitSwitchSubnet

string

If your existing network infrastructure overlaps with the 100.88.0.0/16 IPv4 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. The subnet for the distributed transit switch that enables east-west traffic. This subnet cannot overlap with any other subnets used by OVN-Kubernetes or on the host itself. It must be large enough to accommodate one IP address per node in your cluster.

The default value is 100.88.0.0/16.

internalJoinSubnet

string

If your existing network infrastructure overlaps with the 100.64.0.0/16 IPv4 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. For example, if the clusterNetwork.cidr value is 10.128.0.0/14 and the clusterNetwork.hostPrefix value is /23, then the maximum number of nodes is 2^(23-14)=512.

The default value is 100.64.0.0/16.
Table 5. ovnKubernetesConfig.ipv6 object
Field Type Description

internalTransitSwitchSubnet

string

If your existing network infrastructure overlaps with the fd97::/64 IPv6 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. The subnet for the distributed transit switch that enables east-west traffic. This subnet cannot overlap with any other subnets used by OVN-Kubernetes or on the host itself. It must be large enough to accommodate one IP address per node in your cluster.

The default value is fd97::/64.

internalJoinSubnet

string

If your existing network infrastructure overlaps with the fd98::/64 IPv6 subnet, you can specify a different IP address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster.

The default value is fd98::/64.
Table 6. policyAuditConfig object
Field Type Description

rateLimit

integer

The maximum number of messages to generate every second per node. The default value is 20 messages per second.

maxFileSize

integer

The maximum size for the audit log in bytes. The default value is 50000000 or 50 MB.

maxLogFiles

integer

The maximum number of log files that are retained.

destination

string

One of the following additional audit log targets:

libc

The libc syslog() function of the journald process on the host.

udp:<host>:<port>

A syslog server. Replace <host>:<port> with the host and port of the syslog server.

unix:<file>

A Unix Domain Socket file specified by <file>.

null

Do not send the audit logs to any additional target.

syslogFacility

string

The syslog facility, such as kern, as defined by RFC5424. The default value is local0.
Table 7. gatewayConfig object
Field Type Description

routingViaHost

boolean

Set this field to true to send egress traffic from pods to the host networking stack. For highly-specialized installations and applications that rely on manually configured routes in the kernel routing table, you might want to route egress traffic to the host networking stack. By default, egress traffic is processed in OVN to exit the cluster and is not affected by specialized routes in the kernel routing table. The default value is false.

This field has an interaction with the Open vSwitch hardware offloading feature. If you set this field to true, you do not receive the performance benefits of the offloading because egress traffic is processed by the host networking stack.

ipForwarding

object

You can control IP forwarding for all traffic on OVN-Kubernetes managed interfaces by using the ipForwarding specification in the Network resource. Specify Restricted to only allow IP forwarding for Kubernetes related traffic. Specify Global to allow forwarding of all IP traffic. For new installations, the default is Restricted. For updates to OpenShift Container Platform 4.14 or later, the default is Global.

ipv4

object

Optional: Specify an object to configure the internal OVN-Kubernetes masquerade address for host to service traffic for IPv4 addresses.

ipv6

object

Optional: Specify an object to configure the internal OVN-Kubernetes masquerade address for host to service traffic for IPv6 addresses.
Table 8. gatewayConfig.ipv4 object
Field Type Description

internalMasqueradeSubnet

string

The masquerade IPv4 addresses that are used internally to enable host to service traffic. The host is configured with these IP addresses as well as the shared gateway bridge interface. The default value is 169.254.169.0/29.
Table 9. gatewayConfig.ipv6 object
Field Type Description

internalMasqueradeSubnet

string

The masquerade IPv6 addresses that are used internally to enable host to service traffic. The host is configured with these IP addresses as well as the shared gateway bridge interface. The default value is fd69::/125.
Table 10. ipsecConfig object
Field Type Description

mode

string

Specifies the behavior of the IPsec implementation. Must be one of the following values:

  • Disabled: IPsec is not enabled on cluster nodes.

  • External: IPsec is enabled for network traffic with external hosts.

  • Full: IPsec is enabled for pod traffic and network traffic with external hosts.
Example OVN-Kubernetes configuration with IPSec enabled
defaultNetwork:
  type: OVNKubernetes
  ovnKubernetesConfig:
    mtu: 1400
    genevePort: 6081
      ipsecConfig:
        mode: Full

Using OVNKubernetes can lead to a stack exhaustion problem on IBM Power®.

kubeProxyConfig object configuration (OpenShiftSDN container network interface only)

The values for the kubeProxyConfig object are defined in the following table:

Table 11. kubeProxyConfig object
Field Type Description

iptablesSyncPeriod

string

The refresh period for iptables rules. The default value is 30s. Valid suffixes include s, m, and h and are described in the Go time package documentation.

Because of performance improvements introduced in OpenShift Container Platform 4.3 and greater, adjusting the iptablesSyncPeriod parameter is no longer necessary.

proxyArguments.iptables-min-sync-period

array

The minimum duration before refreshing iptables rules. This field ensures that the refresh does not happen too frequently. Valid suffixes include s, m, and h and are described in the Go time package. The default value is:

kubeProxyConfig:
  proxyArguments:
    iptables-min-sync-period:
    - 0s

Creating the Ignition config files

Because you must manually start the cluster machines, you must generate the Ignition config files that the cluster needs to make its machines.

  • The Ignition config files that the installation program generates contain certificates that expire after 24 hours, which are then renewed at that time. If the cluster is shut down before renewing the certificates and the cluster is later restarted after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information.

  • It is recommended that you use Ignition config files within 12 hours after they are generated because the 24-hour certificate rotates from 16 to 22 hours after the cluster is installed. By using the Ignition config files within 12 hours, you can avoid installation failure if the certificate update runs during installation.
Prerequisites

  • Obtain the OpenShift Container Platform installation program and the pull secret for your cluster.

Procedure

  • Obtain the Ignition config files:

    $ ./openshift-install create ignition-configs --dir <installation_directory> (1)
    1 For <installation_directory>, specify the directory name to store the files that the installation program creates.

    If you created an install-config.yaml file, specify the directory that contains it. Otherwise, specify an empty 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.

    The following files are generated in the directory:

    .
├── auth
│   ├── kubeadmin-password
│   └── kubeconfig
├── bootstrap.ign
├── master.ign
├── metadata.json
└── worker.ign

Extracting the infrastructure name

The Ignition config files contain a unique cluster identifier that you can use to uniquely identify your cluster in VMware vSphere. If you plan to use the cluster identifier as the name of your virtual machine folder, you must extract it.

Prerequisites

  • You obtained the OpenShift Container Platform installation program and the pull secret for your cluster.

  • You generated the Ignition config files for your cluster.

  • You installed the jq package.

Procedure

  • To extract and view the infrastructure name from the Ignition config file metadata, run the following command:

    $ jq -r .infraID <installation_directory>/metadata.json (1)
    1 For <installation_directory>, specify the path to the directory that you stored the installation files in.
    Example output
    openshift-vw9j6 (1)
    1 The output of this command is your cluster name and a random string.

Installing RHCOS and starting the OpenShift Container Platform bootstrap process

To install OpenShift Container Platform on user-provisioned infrastructure on VMware vSphere, you must install Red Hat Enterprise Linux CoreOS (RHCOS) on vSphere hosts. When you install RHCOS, you must provide the Ignition config file that was generated by the OpenShift Container Platform installation program for the type of machine you are installing. If you have configured suitable networking, DNS, and load balancing infrastructure, the OpenShift Container Platform bootstrap process begins automatically after the RHCOS machines have rebooted.

Prerequisites

  • You have obtained the Ignition config files for your cluster.

  • You have access to an HTTP server that you can access from your computer and that the machines that you create can access.

  • You have created a vSphere cluster.

Procedure

  1. Upload the bootstrap Ignition config file, which is named <installation_directory>/bootstrap.ign, that the installation program created to your HTTP server. Note the URL of this file.

  2. Save the following secondary Ignition config file for your bootstrap node to your computer as <installation_directory>/merge-bootstrap.ign:

    {
  "ignition": {
    "config": {
      "merge": [
        {
          "source": "<bootstrap_ignition_config_url>", (1)
          "verification": {}
        }
      ]
    },
    "timeouts": {},
    "version": "3.2.0"
  },
  "networkd": {},
  "passwd": {},
  "storage": {},
  "systemd": {}
}
    1 Specify the URL of the bootstrap Ignition config file that you hosted.

    When you create the virtual machine (VM) for the bootstrap machine, you use this Ignition config file.

  3. Locate the following Ignition config files that the installation program created:

    • <installation_directory>/master.ign

    • <installation_directory>/worker.ign

    • <installation_directory>/merge-bootstrap.ign

  4. Convert the Ignition config files to Base64 encoding. Later in this procedure, you must add these files to the extra configuration parameter guestinfo.ignition.config.data in your VM.

    For example, if you use a Linux operating system, you can use the base64 command to encode the files.

    $ base64 -w0 <installation_directory>/master.ign > <installation_directory>/master.64
    $ base64 -w0 <installation_directory>/worker.ign > <installation_directory>/worker.64
    $ base64 -w0 <installation_directory>/merge-bootstrap.ign > <installation_directory>/merge-bootstrap.64

    If you plan to add more compute machines to your cluster after you finish installation, do not delete these files.

  5. Obtain the RHCOS OVA image. Images are available from the RHCOS image mirror page.

    The RHCOS images might not change with every release of OpenShift Container Platform. You must download an image with the highest version that is less than or equal to the OpenShift Container Platform version that you install. Use the image version that matches your OpenShift Container Platform version if it is available.

    The filename contains the OpenShift Container Platform version number in the format rhcos-vmware.<architecture>.ova.

  6. In the vSphere Client, create a folder in your data center to store your VMs.

    1. Click the VMs and Templates view.

    2. Right-click the name of your data center.

    3. Click New Folder → New VM and Template Folder.

    4. In the window that is displayed, enter the folder name. If you did not specify an existing folder in the install-config.yaml file, then create a folder with the same name as the infrastructure ID. You use this folder name so vCenter dynamically provisions storage in the appropriate location for its Workspace configuration.

  7. In the vSphere Client, create a template for the OVA image and then clone the template as needed.

    In the following steps, you create a template and then clone the template for all of your cluster machines. You then provide the location for the Ignition config file for that cloned machine type when you provision the VMs.

    1. From the Hosts and Clusters tab, right-click your cluster name and select Deploy OVF Template.

    2. On the Select an OVF tab, specify the name of the RHCOS OVA file that you downloaded.

    3. On the Select a name and folder tab, set a Virtual machine name for your template, such as Template-RHCOS. Click the name of your vSphere cluster and select the folder you created in the previous step.

    4. On the Select a compute resource tab, click the name of your vSphere cluster.

    5. On the Select storage tab, configure the storage options for your VM.

      • Select Thin Provision or Thick Provision, based on your storage preferences.

      • Select the datastore that you specified in your install-config.yaml file.

      • If you want to encrypt your virtual machines, select Encrypt this virtual machine. See the section titled "Requirements for encrypting virtual machines" for more information.

    6. On the Select network tab, specify the network that you configured for the cluster, if available.

    7. When creating the OVF template, do not specify values on the Customize template tab or configure the template any further.

      Do not start the original VM template. The VM template must remain off and must be cloned for new RHCOS machines. Starting the VM template configures the VM template as a VM on the platform, which prevents it from being used as a template that compute machine sets can apply configurations to.

  8. Optional: Update the configured virtual hardware version in the VM template, if necessary. Follow Upgrading a virtual machine to the latest hardware version in the VMware documentation for more information.

    It is recommended that you update the hardware version of the VM template to version 15 before creating VMs from it, if necessary. Using hardware version 13 for your cluster nodes running on vSphere is now deprecated. If your imported template defaults to hardware version 13, you must ensure that your ESXi host is on 6.7U3 or later before upgrading the VM template to hardware version 15. If your vSphere version is less than 6.7U3, you can skip this upgrade step; however, a future version of OpenShift Container Platform is scheduled to remove support for hardware version 13 and vSphere versions less than 6.7U3.

  9. After the template deploys, deploy a VM for a machine in the cluster.

    1. Right-click the template name and click Clone → Clone to Virtual Machine.

    2. On the Select a name and folder tab, specify a name for the VM. You might include the machine type in the name, such as control-plane-0 or compute-1.

      Ensure that all virtual machine names across a vSphere installation are unique.

    3. On the Select a name and folder tab, select the name of the folder that you created for the cluster.

    4. On the Select a compute resource tab, select the name of a host in your data center.

    5. On the Select clone options tab, select Customize this virtual machine’s hardware.

    6. On the Customize hardware tab, click Advanced Parameters.

      The following configuration suggestions are for example purposes only. As a cluster administrator, you must configure resources according to the resource demands placed on your cluster. To best manage cluster resources, consider creating a resource pool from the cluster’s root resource pool.

      • Optional: Override default DHCP networking in vSphere. To enable static IP networking:

        • Set your static IP configuration:

          Example command
          $ export IPCFG="ip=<ip>::<gateway>:<netmask>:<hostname>:<iface>:none nameserver=srv1 [nameserver=srv2 [nameserver=srv3 [...]]]"
          Example command
          $ export IPCFG="ip=192.168.100.101::192.168.100.254:255.255.255.0:::none nameserver=8.8.8.8"

        • Set the guestinfo.afterburn.initrd.network-kargs property before you boot a VM from an OVA in vSphere:

          Example command
          $ govc vm.change -vm "<vm_name>" -e "guestinfo.afterburn.initrd.network-kargs=${IPCFG}"

      • Add the following configuration parameter names and values by specifying data in the Attribute and Values fields. Ensure that you select the Add button for each parameter that you create.

        • guestinfo.ignition.config.data: Locate the base-64 encoded files that you created previously in this procedure, and paste the contents of the base64-encoded Ignition config file for this machine type.

        • guestinfo.ignition.config.data.encoding: Specify base64.

        • disk.EnableUUID: Specify TRUE.

        • stealclock.enable: If this parameter was not defined, add it and specify TRUE.

        • Create a child resource pool from the cluster’s root resource pool. Perform resource allocation in this child resource pool.

    7. In the Virtual Hardware panel of the Customize hardware tab, modify the specified values as required. Ensure that the amount of RAM, CPU, and disk storage meets the minimum requirements for the machine type.

    8. Complete the remaining configuration steps. On clicking the Finish button, you have completed the cloning operation.

    9. From the Virtual Machines tab, right-click on your VM and then select Power → Power On.

    10. Check the console output to verify that Ignition ran.

      Example command
      Ignition: ran on 2022/03/14 14:48:33 UTC (this boot)
Ignition: user-provided config was applied
Next steps

  • Create the rest of the machines for your cluster by following the preceding steps for each machine.

    You must create the bootstrap and control plane machines at this time. Because some pods are deployed on compute machines by default, also create at least two compute machines before you install the cluster.

Adding more compute machines to a cluster in vSphere

You can add more compute machines to a user-provisioned OpenShift Container Platform cluster on VMware vSphere.

After your vSphere template deploys in your OpenShift Container Platform cluster, you can deploy a virtual machine (VM) for a machine in that cluster.

Prerequisites

  • Obtain the base64-encoded Ignition file for your compute machines.

  • You have access to the vSphere template that you created for your cluster.

Procedure

  1. Right-click the template’s name and click Clone → Clone to Virtual Machine.

  2. On the Select a name and folder tab, specify a name for the VM. You might include the machine type in the name, such as compute-1.

    Ensure that all virtual machine names across a vSphere installation are unique.

  3. On the Select a name and folder tab, select the name of the folder that you created for the cluster.

  4. On the Select a compute resource tab, select the name of a host in your data center.

  5. On the Select storage tab, select storage for your configuration and disk files.

  6. On the Select clone options tab, select Customize this virtual machine’s hardware.

  7. On the Customize hardware tab, click Advanced Parameters.

    • Add the following configuration parameter names and values by specifying data in the Attribute and Values fields. Ensure that you select the Add button for each parameter that you create.

      • guestinfo.ignition.config.data: Paste the contents of the base64-encoded compute Ignition config file for this machine type.

      • guestinfo.ignition.config.data.encoding: Specify base64.

      • disk.EnableUUID: Specify TRUE.

  8. In the Virtual Hardware panel of the Customize hardware tab, modify the specified values as required. Ensure that the amount of RAM, CPU, and disk storage meets the minimum requirements for the machine type. If many networks exist, select Add New Device > Network Adapter, and then enter your network information in the fields provided by the New Network menu item.

  9. Complete the remaining configuration steps. On clicking the Finish button, you have completed the cloning operation.

  10. From the Virtual Machines tab, right-click on your VM and then select Power → Power On.

Next steps

  • Continue to create more compute machines for your cluster.

Disk partitioning

In most cases, data partitions are originally created by installing RHCOS, rather than by installing another operating system. In such cases, the OpenShift Container Platform installer should be allowed to configure your disk partitions.

However, there are two cases where you might want to intervene to override the default partitioning when installing an OpenShift Container Platform node:

  • Create separate partitions: For greenfield installations on an empty disk, you might want to add separate storage to a partition. This is officially supported for making /var or a subdirectory of /var, such as /var/lib/etcd, a separate partition, but not both.

    For disk sizes larger than 100GB, and especially disk sizes larger than 1TB, create a separate /var partition. See "Creating a separate /var partition" and this Red Hat Knowledgebase article for more information.

    Kubernetes supports only two file system partitions. If you add more than one partition to the original configuration, Kubernetes cannot monitor all of them.

  • Retain existing partitions: For a brownfield installation where you are reinstalling OpenShift Container Platform on an existing node and want to retain data partitions installed from your previous operating system, there are both boot arguments and options to coreos-installer that allow you to retain existing data partitions.

Creating a separate /var partition

In general, disk partitioning for OpenShift Container Platform should be left to the installer. However, there are cases where you might want to create separate partitions in a part of the filesystem that you expect to grow.

OpenShift Container Platform supports the addition of a single partition to attach storage to either the /var partition or a subdirectory of /var. For example:

  • /var/lib/containers: Holds container-related content that can grow as more images and containers are added to a system.

  • /var/lib/etcd: Holds data that you might want to keep separate for purposes such as performance optimization of etcd storage.

  • /var: Holds data that you might want to keep separate for purposes such as auditing.

    For disk sizes larger than 100GB, and especially larger than 1TB, create a separate /var partition.

Storing the contents of a /var directory separately makes it easier to grow storage for those areas as needed and reinstall OpenShift Container Platform at a later date and keep that data intact. With this method, you will not have to pull all your containers again, nor will you have to copy massive log files when you update systems.

Because /var must be in place before a fresh installation of Red Hat Enterprise Linux CoreOS (RHCOS), the following procedure sets up the separate /var partition by creating a machine config manifest that is inserted during the openshift-install preparation phases of an OpenShift Container Platform installation.

Procedure

  1. Create a directory to hold the OpenShift Container Platform installation files:

    $ mkdir $HOME/clusterconfig

  2. Run openshift-install to create a set of files in the manifest and openshift subdirectories. Answer the system questions as you are prompted:

    $ openshift-install create manifests --dir $HOME/clusterconfig
? SSH Public Key ...
$ ls $HOME/clusterconfig/openshift/
99_kubeadmin-password-secret.yaml
99_openshift-cluster-api_master-machines-0.yaml
99_openshift-cluster-api_master-machines-1.yaml
99_openshift-cluster-api_master-machines-2.yaml
...

  3. Create a Butane config that configures the additional partition. For example, name the file $HOME/clusterconfig/98-var-partition.bu, change the disk device name to the name of the storage device on the worker systems, and set the storage size as appropriate. This example places the /var directory on a separate partition:

    variant: openshift
version: 4.16.0
metadata:
  labels:
    machineconfiguration.openshift.io/role: worker
  name: 98-var-partition
storage:
  disks:
  - device: /dev/disk/by-id/<device_name> (1)
    partitions:
    - label: var
      start_mib: <partition_start_offset> (2)
      size_mib: <partition_size> (3)
      number: 5
  filesystems:
    - device: /dev/disk/by-partlabel/var
      path: /var
      format: xfs
      mount_options: [defaults, prjquota] (4)
      with_mount_unit: true
    1 The storage device name of the disk that you want to partition.
    2 When adding a data partition to the boot disk, a minimum value of 25000 mebibytes is recommended. The root file system is automatically resized to fill all available space up to the specified offset. If no value is specified, or if the specified value is smaller than the recommended minimum, the resulting root file system will be too small, and future reinstalls of RHCOS might overwrite the beginning of the data partition.
    3 The size of the data partition in mebibytes.
    4 The prjquota mount option must be enabled for filesystems used for container storage.

    When creating a separate /var partition, you cannot use different instance types for worker nodes, if the different instance types do not have the same device name.

  4. Create a manifest from the Butane config and save it to the clusterconfig/openshift directory. For example, run the following command:

    $ butane $HOME/clusterconfig/98-var-partition.bu -o $HOME/clusterconfig/openshift/98-var-partition.yaml

  5. Run openshift-install again to create Ignition configs from a set of files in the manifest and openshift subdirectories:

    $ openshift-install create ignition-configs --dir $HOME/clusterconfig
$ ls $HOME/clusterconfig/
auth  bootstrap.ign  master.ign  metadata.json  worker.ign

Now you can use the Ignition config files as input to the vSphere installation procedures to install Red Hat Enterprise Linux CoreOS (RHCOS) systems.

Waiting for the bootstrap process to complete

The OpenShift Container Platform bootstrap process begins after the cluster nodes first boot into the persistent RHCOS environment that has been installed to disk. The configuration information provided through the Ignition config files is used to initialize the bootstrap process and install OpenShift Container Platform on the machines. You must wait for the bootstrap process to complete.

Prerequisites

  • You have created the Ignition config files for your cluster.

  • You have configured suitable network, DNS and load balancing infrastructure.

  • You have obtained the installation program and generated the Ignition config files for your cluster.

  • You installed RHCOS on your cluster machines and provided the Ignition config files that the OpenShift Container Platform installation program generated.

  • Your machines have direct internet access or have an HTTP or HTTPS proxy available.

Procedure

  1. Monitor the bootstrap process:

    $ ./openshift-install --dir <installation_directory> wait-for bootstrap-complete \ (1)
    --log-level=info (2)
    1 For <installation_directory>, specify the path to the directory that you stored the installation files in.
    2 To view different installation details, specify warn, debug, or error instead of info.
    Example output
    INFO Waiting up to 30m0s for the Kubernetes API at https://api.test.example.com:6443...
INFO API v1.29.4 up
INFO Waiting up to 30m0s for bootstrapping to complete...
INFO It is now safe to remove the bootstrap resources

    The command succeeds when the Kubernetes API server signals that it has been bootstrapped on the control plane machines.

  2. After the bootstrap process is complete, remove the bootstrap machine from the load balancer.

    You must remove the bootstrap machine from the load balancer at this point. You can also remove or reformat the bootstrap machine itself.

Logging in to the cluster by using the CLI

You can log in to your cluster as a default system user by exporting the cluster kubeconfig file. The kubeconfig file contains information about the cluster that is used by the CLI to connect a client to the correct cluster and API server. The file is specific to a cluster and is created during OpenShift Container Platform installation.

Prerequisites

  • You deployed an OpenShift Container Platform cluster.

  • You installed the oc CLI.

Procedure

  1. Export the kubeadmin credentials:

    $ export KUBECONFIG=<installation_directory>/auth/kubeconfig (1)
    1 For <installation_directory>, specify the path to the directory that you stored the installation files in.

  2. Verify you can run oc commands successfully using the exported configuration:

    $ oc whoami
    Example output
    system:admin

Approving the certificate signing requests for your machines

When you add machines to a cluster, two pending certificate signing requests (CSRs) are generated for each machine that you added. You must confirm that these CSRs are approved or, if necessary, approve them yourself. The client requests must be approved first, followed by the server requests.

Prerequisites

  • You added machines to your cluster.

Procedure

  1. Confirm that the cluster recognizes the machines:

    $ oc get nodes
    Example output
    NAME      STATUS    ROLES   AGE  VERSION
master-0  Ready     master  63m  v1.29.4
master-1  Ready     master  63m  v1.29.4
master-2  Ready     master  64m  v1.29.4

    The output lists all of the machines that you created.

    The preceding output might not include the compute nodes, also known as worker nodes, until some CSRs are approved.

  2. Review the pending CSRs and ensure that you see the client requests with the Pending or Approved status for each machine that you added to the cluster:

    $ oc get csr
    Example output
    NAME        AGE     REQUESTOR                                                                   CONDITION
csr-8b2br   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
csr-8vnps   15m     system:serviceaccount:openshift-machine-config-operator:node-bootstrapper   Pending
...

    In this example, two machines are joining the cluster. You might see more approved CSRs in the list.

  3. If the CSRs were not approved, after all of the pending CSRs for the machines you added are in Pending status, approve the CSRs for your cluster machines:

    Because the CSRs rotate automatically, approve your CSRs within an hour of adding the machines to the cluster. If you do not approve them within an hour, the certificates will rotate, and more than two certificates will be present for each node. You must approve all of these certificates. After the client CSR is approved, the Kubelet creates a secondary CSR for the serving certificate, which requires manual approval. Then, subsequent serving certificate renewal requests are automatically approved by the machine-approver if the Kubelet requests a new certificate with identical parameters.

    For clusters running on platforms that are not machine API enabled, such as bare metal and other user-provisioned infrastructure, you must implement a method of automatically approving the kubelet serving certificate requests (CSRs). If a request is not approved, then the oc exec, oc rsh, and oc logs commands cannot succeed, because a serving certificate is required when the API server connects to the kubelet. Any operation that contacts the Kubelet endpoint requires this certificate approval to be in place. The method must watch for new CSRs, confirm that the CSR was submitted by the node-bootstrapper service account in the system:node or system:admin groups, and confirm the identity of the node.

    • To approve them individually, run the following command for each valid CSR:

      $ oc adm certificate approve <csr_name> (1)
      1 <csr_name> is the name of a CSR from the list of current CSRs.

    • To approve all pending CSRs, run the following command:

      $ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs --no-run-if-empty oc adm certificate approve

      Some Operators might not become available until some CSRs are approved.

  4. Now that your client requests are approved, you must review the server requests for each machine that you added to the cluster:

    $ oc get csr
    Example output
    NAME        AGE     REQUESTOR                                                                   CONDITION
csr-bfd72   5m26s   system:node:ip-10-0-50-126.us-east-2.compute.internal                       Pending
csr-c57lv   5m26s   system:node:ip-10-0-95-157.us-east-2.compute.internal                       Pending
...

  5. If the remaining CSRs are not approved, and are in the Pending status, approve the CSRs for your cluster machines:

    • To approve them individually, run the following command for each valid CSR:

      $ oc adm certificate approve <csr_name> (1)
      1 <csr_name> is the name of a CSR from the list of current CSRs.

    • To approve all pending CSRs, run the following command:

      $ oc get csr -o go-template='{{range .items}}{{if not .status}}{{.metadata.name}}{{"\n"}}{{end}}{{end}}' | xargs oc adm certificate approve

  6. After all client and server CSRs have been approved, the machines have the Ready status. Verify this by running the following command:

    $ oc get nodes
    Example output
    NAME      STATUS    ROLES   AGE  VERSION
master-0  Ready     master  73m  v1.29.4
master-1  Ready     master  73m  v1.29.4
master-2  Ready     master  74m  v1.29.4
worker-0  Ready     worker  11m  v1.29.4
worker-1  Ready     worker  11m  v1.29.4

    It can take a few minutes after approval of the server CSRs for the machines to transition to the Ready status.
Additional information

Initial Operator configuration

After the control plane initializes, you must immediately configure some Operators so that they all become available.

Prerequisites

  • Your control plane has initialized.

Procedure

  1. Watch the cluster components come online:

    $ watch -n5 oc get clusteroperators
    Example output
    NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
authentication                             4.16.0    True        False         False      19m
baremetal                                  4.16.0    True        False         False      37m
cloud-credential                           4.16.0    True        False         False      40m
cluster-autoscaler                         4.16.0    True        False         False      37m
config-operator                            4.16.0    True        False         False      38m
console                                    4.16.0    True        False         False      26m
csi-snapshot-controller                    4.16.0    True        False         False      37m
dns                                        4.16.0    True        False         False      37m
etcd                                       4.16.0    True        False         False      36m
image-registry                             4.16.0    True        False         False      31m
ingress                                    4.16.0    True        False         False      30m
insights                                   4.16.0    True        False         False      31m
kube-apiserver                             4.16.0    True        False         False      26m
kube-controller-manager                    4.16.0    True        False         False      36m
kube-scheduler                             4.16.0    True        False         False      36m
kube-storage-version-migrator              4.16.0    True        False         False      37m
machine-api                                4.16.0    True        False         False      29m
machine-approver                           4.16.0    True        False         False      37m
machine-config                             4.16.0    True        False         False      36m
marketplace                                4.16.0    True        False         False      37m
monitoring                                 4.16.0    True        False         False      29m
network                                    4.16.0    True        False         False      38m
node-tuning                                4.16.0    True        False         False      37m
openshift-apiserver                        4.16.0    True        False         False      32m
openshift-controller-manager               4.16.0    True        False         False      30m
openshift-samples                          4.16.0    True        False         False      32m
operator-lifecycle-manager                 4.16.0    True        False         False      37m
operator-lifecycle-manager-catalog         4.16.0    True        False         False      37m
operator-lifecycle-manager-packageserver   4.16.0    True        False         False      32m
service-ca                                 4.16.0    True        False         False      38m
storage                                    4.16.0    True        False         False      37m

  2. Configure the Operators that are not available.

Image registry removed during installation

On platforms that do not provide shareable object storage, the OpenShift Image Registry Operator bootstraps itself as Removed. This allows openshift-installer to complete installations on these platform types.

After installation, you must edit the Image Registry Operator configuration to switch the managementState from Removed to Managed. When this has completed, you must configure storage.

Image registry storage configuration

The Image Registry Operator is not initially available for platforms that do not provide default storage. After installation, you must configure your registry to use storage so that the Registry Operator is made available.

Instructions are shown for configuring a persistent volume, which is required for production clusters. Where applicable, instructions are shown for configuring an empty directory as the storage location, which is available for only non-production clusters.

Additional instructions are provided for allowing the image registry to use block storage types by using the Recreate rollout strategy during upgrades.

Configuring block registry storage for VMware vSphere

To allow the image registry to use block storage types such as vSphere Virtual Machine Disk (VMDK) during upgrades as a cluster administrator, you can use the Recreate rollout strategy.

Block storage volumes are supported but not recommended for use with image registry on production clusters. An installation where the registry is configured on block storage is not highly available because the registry cannot have more than one replica.
Procedure

  1. Enter the following command to set the image registry storage as a block storage type, patch the registry so that it uses the Recreate rollout strategy, and runs with only 1 replica:

    $ oc patch config.imageregistry.operator.openshift.io/cluster --type=merge -p '{"spec":{"rolloutStrategy":"Recreate","replicas":1}}'

  2. Provision the PV for the block storage device, and create a PVC for that volume. The requested block volume uses the ReadWriteOnce (RWO) access mode.

    1. Create a pvc.yaml file with the following contents to define a VMware vSphere PersistentVolumeClaim object:

      kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: image-registry-storage (1)
  namespace: openshift-image-registry (2)
spec:
  accessModes:
  - ReadWriteOnce (3)
  resources:
    requests:
      storage: 100Gi (4)
      1 A unique name that represents the PersistentVolumeClaim object.
      2 The namespace for the PersistentVolumeClaim object, which is openshift-image-registry.
      3 The access mode of the persistent volume claim. With ReadWriteOnce, the volume can be mounted with read and write permissions by a single node.
      4 The size of the persistent volume claim.

    2. Enter the following command to create the PersistentVolumeClaim object from the file:

      $ oc create -f pvc.yaml -n openshift-image-registry

  3. Enter the following command to edit the registry configuration so that it references the correct PVC:

    $ oc edit config.imageregistry.operator.openshift.io -o yaml
    Example output
    storage:
  pvc:
    claim: (1)
    1 By creating a custom PVC, you can leave the claim field blank for the default automatic creation of an image-registry-storage PVC.

For instructions about configuring registry storage so that it references the correct PVC, see Configuring the registry for vSphere.

Completing installation on user-provisioned infrastructure

After you complete the Operator configuration, you can finish installing the cluster on infrastructure that you provide.

Prerequisites

  • Your control plane has initialized.

  • You have completed the initial Operator configuration.

Procedure

  1. Confirm that all the cluster components are online with the following command:

    $ watch -n5 oc get clusteroperators
    Example output
    NAME                                       VERSION   AVAILABLE   PROGRESSING   DEGRADED   SINCE
authentication                             4.16.0    True        False         False      19m
baremetal                                  4.16.0    True        False         False      37m
cloud-credential                           4.16.0    True        False         False      40m
cluster-autoscaler                         4.16.0    True        False         False      37m
config-operator                            4.16.0    True        False         False      38m
console                                    4.16.0    True        False         False      26m
csi-snapshot-controller                    4.16.0    True        False         False      37m
dns                                        4.16.0    True        False         False      37m
etcd                                       4.16.0    True        False         False      36m
image-registry                             4.16.0    True        False         False      31m
ingress                                    4.16.0    True        False         False      30m
insights                                   4.16.0    True        False         False      31m
kube-apiserver                             4.16.0    True        False         False      26m
kube-controller-manager                    4.16.0    True        False         False      36m
kube-scheduler                             4.16.0    True        False         False      36m
kube-storage-version-migrator              4.16.0    True        False         False      37m
machine-api                                4.16.0    True        False         False      29m
machine-approver                           4.16.0    True        False         False      37m
machine-config                             4.16.0    True        False         False      36m
marketplace                                4.16.0    True        False         False      37m
monitoring                                 4.16.0    True        False         False      29m
network                                    4.16.0    True        False         False      38m
node-tuning                                4.16.0    True        False         False      37m
openshift-apiserver                        4.16.0    True        False         False      32m
openshift-controller-manager               4.16.0    True        False         False      30m
openshift-samples                          4.16.0    True        False         False      32m
operator-lifecycle-manager                 4.16.0    True        False         False      37m
operator-lifecycle-manager-catalog         4.16.0    True        False         False      37m
operator-lifecycle-manager-packageserver   4.16.0    True        False         False      32m
service-ca                                 4.16.0    True        False         False      38m
storage                                    4.16.0    True        False         False      37m

    Alternatively, the following command notifies you when all of the clusters are available. It also retrieves and displays credentials:

    $ ./openshift-install --dir <installation_directory> wait-for install-complete (1)
    1 For <installation_directory>, specify the path to the directory that you stored the installation files in.
    Example output
    INFO Waiting up to 30m0s for the cluster to initialize...

    The command succeeds when the Cluster Version Operator finishes deploying the OpenShift Container Platform cluster from Kubernetes API server.

    • The Ignition config files that the installation program generates contain certificates that expire after 24 hours, which are then renewed at that time. If the cluster is shut down before renewing the certificates and the cluster is later restarted after the 24 hours have elapsed, the cluster automatically recovers the expired certificates. The exception is that you must manually approve the pending node-bootstrapper certificate signing requests (CSRs) to recover kubelet certificates. See the documentation for Recovering from expired control plane certificates for more information.

    • It is recommended that you use Ignition config files within 12 hours after they are generated because the 24-hour certificate rotates from 16 to 22 hours after the cluster is installed. By using the Ignition config files within 12 hours, you can avoid installation failure if the certificate update runs during installation.

  2. Confirm that the Kubernetes API server is communicating with the pods.

    1. To view a list of all pods, use the following command:

      $ oc get pods --all-namespaces
      Example output
      NAMESPACE                         NAME                                            READY   STATUS      RESTARTS   AGE
openshift-apiserver-operator      openshift-apiserver-operator-85cb746d55-zqhs8   1/1     Running     1          9m
openshift-apiserver               apiserver-67b9g                                 1/1     Running     0          3m
openshift-apiserver               apiserver-ljcmx                                 1/1     Running     0          1m
openshift-apiserver               apiserver-z25h4                                 1/1     Running     0          2m
openshift-authentication-operator authentication-operator-69d5d8bf84-vh2n8        1/1     Running     0          5m
...

    2. View the logs for a pod that is listed in the output of the previous command by using the following command:

      $ oc logs <pod_name> -n <namespace> (1)
      1 Specify the pod name and namespace, as shown in the output of the previous command.

      If the pod logs display, the Kubernetes API server can communicate with the cluster machines.

  3. For an installation with Fibre Channel Protocol (FCP), additional steps are required to enable multipathing. Do not enable multipathing during installation.

    See "Enabling multipathing with kernel arguments on RHCOS" in the Postinstallation machine configuration tasks documentation for more information.

You can add extra compute machines after the cluster installation is completed by following Adding compute machines to vSphere.

Configuring vSphere DRS anti-affinity rules for control plane nodes

vSphere Distributed Resource Scheduler (DRS) anti-affinity rules can be configured to support higher availability of OpenShift Container Platform Control Plane nodes. Anti-affinity rules ensure that the vSphere Virtual Machines for the OpenShift Container Platform Control Plane nodes are not scheduled to the same vSphere Host.

  • The following information applies to compute DRS only and does not apply to storage DRS.

  • The govc command is an open-source command available from VMware; it is not available from Red Hat. The govc command is not supported by the Red Hat support.

  • Instructions for downloading and installing govc are found on the VMware documentation website.

Create an anti-affinity rule by running the following command:

Example command
$ govc cluster.rule.create \
  -name openshift4-control-plane-group \
  -dc MyDatacenter -cluster MyCluster \
  -enable \
  -anti-affinity master-0 master-1 master-2

After creating the rule, your control plane nodes are automatically migrated by vSphere so they are not running on the same hosts. This might take some time while vSphere reconciles the new rule. Successful command completion is shown in the following procedure.

The migration occurs automatically and might cause brief OpenShift API outage or latency until the migration finishes.

The vSphere DRS anti-affinity rules need to be updated manually in the event of a control plane VM name change or migration to a new vSphere Cluster.

Procedure

  1. Remove any existing DRS anti-affinity rule by running the following command:

    $ govc cluster.rule.remove \
  -name openshift4-control-plane-group \
  -dc MyDatacenter -cluster MyCluster
    Example Output
    [13-10-22 09:33:24] Reconfigure /MyDatacenter/host/MyCluster...OK

  2. Create the rule again with updated names by running the following command:

    $ govc cluster.rule.create \
  -name openshift4-control-plane-group \
  -dc MyDatacenter -cluster MyOtherCluster \
  -enable \
  -anti-affinity master-0 master-1 master-2

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

Next steps