Chapter 2. Installing a cluster on Nutanix

Procedure

1. If you do not have an existing SSH key pair on your local machine to use for authentication onto your cluster nodes, create one. For example, on a computer that uses a Linux operating system, run the following command:

   $ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> 

   1

   1

   Specify the path and file name, such as ~/.ssh/id_ed25519, of the new SSH key. If you have an existing key pair, ensure your public key is in the your ~/.ssh directory.

   Note

   If you plan to install an OpenShift Container Platform cluster that uses the RHEL cryptographic libraries that have been submitted to NIST for FIPS 140-2/140-3 Validation on only the

   x86_64

   ,

   ppc64le

   , and

   s390x

   architectures, do not create a key that uses the

   ed25519

   algorithm. Instead, create a key that uses the

   rsa

   or

   ecdsa

   algorithm.

2. View the public SSH key:

   $ cat <path>/<file_name>.pub

   For example, run the following to view the

   ~/.ssh/id_ed25519.pub

   public key:

   $ cat ~/.ssh/id_ed25519.pub

3. Add the SSH private key identity to the SSH agent for your local user, if it has not already been added. SSH agent management of the key is required for password-less SSH authentication onto your cluster nodes, or if you want to use the

   ./openshift-install gather

   command.
   Note

   On some distributions, default SSH private key identities such as

   ~/.ssh/id_rsa

   and

   ~/.ssh/id_dsa

   are managed automatically.

   1. If the

      ssh-agent

      process is not already running for your local user, start it as a background task:

      $ eval "$(ssh-agent -s)"

      Example output

      Agent pid 31874

      Note

      If your cluster is in FIPS mode, only use FIPS-compliant algorithms to generate the SSH key. The key must be either RSA or ECDSA.

4. Add your SSH private key to the

   ssh-agent

   :

   $ ssh-add <path>/<file_name> 

   1

   1

   Specify the path and file name for your SSH private key, such as ~/.ssh/id_ed25519

   Example output

   Identity added: /home/<you>/<path>/<file_name> (<computer_name>)

Procedure

1. Go to the Cluster Type page on the Red Hat Hybrid Cloud Console. If you have a Red Hat account, log in with your credentials. If you do not, create an account.
2. Select your infrastructure provider from the Run it yourself section of the page.
3. Select your host operating system and architecture from the dropdown menus under OpenShift Installer and click Download Installer.

4. Place the downloaded file in the directory where you want to store the installation configuration files.

   Important
   • The installation program creates several files on the computer that you use to install your cluster. You must keep the installation program and the files that the installation program creates after you finish installing the cluster. Both of the files are required to delete the cluster.
   • Deleting the files created by the installation program does not remove your cluster, even if the cluster failed during installation. To remove your cluster, complete the OpenShift Container Platform uninstallation procedures for your specific cloud provider.

5. Extract the installation program. For example, on a computer that uses a Linux operating system, run the following command:

   $ tar -xvf openshift-install-linux.tar.gz

6. Download your installation pull secret from Red Hat OpenShift Cluster Manager. This pull secret allows you to authenticate with the services that are provided by the included authorities, including Quay.io, which serves the container images for OpenShift Container Platform components.

Procedure

1. From the Prism Central web console, download the Nutanix root CA certificates.
2. Extract the compressed file that contains the Nutanix root CA certificates.

3. Add the files for your operating system to the system trust. For example, on a Fedora operating system, run the following command:

   # cp certs/lin/* /etc/pki/ca-trust/source/anchors

4. Update your system trust. For example, on a Fedora operating system, run the following command:

   # update-ca-trust extract

Procedure

1. Create the

   install-config.yaml

   file.

   1. Change to the directory that contains the installation program and run the following command:

      $ ./openshift-install create install-config --dir <installation_directory> 

      1

      1

      For <installation_directory>, specify the directory name to store the files that the installation program creates.

      When specifying the directory:

      • Verify that the directory has the

        execute

        permission. This permission is required to run Terraform binaries under the installation directory.

      • Use an empty directory. Some installation assets, such as bootstrap X.509 certificates, have short expiration intervals, therefore 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.

        Note

        Always delete the

        ~/.powervs

        directory to avoid reusing a stale configuration. Run the following command:

        $ rm -rf ~/.powervs

   2. At the prompts, provide the configuration details for your cloud:

      1. Optional: Select an SSH key to use to access your cluster machines.

         Note

         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.

      2. Select nutanix as the platform to target.
      3. Enter the Prism Central domain name or IP address.
      4. Enter the port that is used to log into Prism Central.

      5. Enter the credentials that are used to log into Prism Central.

         The installation program connects to Prism Central.

      6. Select the Prism Element that will manage the OpenShift Container Platform cluster.
      7. Select the network subnet to use.
      8. Enter the virtual IP address that you configured for control plane API access.
      9. Enter the virtual IP address that you configured for cluster ingress.
      10. Enter the base domain. This base domain must be the same one that you configured in the DNS records.

      11. Enter a descriptive name for your cluster.

          The cluster name you enter must match the cluster name you specified when configuring the DNS records.

2. Optional: Update one or more of the default configuration parameters in the

   install.config.yaml

   file to customize the installation.

   For more information about the parameters, see "Installation configuration parameters".

   Note

   If you are installing a three-node cluster, be sure to set the

   compute.replicas

   parameter to

   0

   . This ensures that cluster’s control planes are schedulable. For more information, see "Installing a three-node cluster on Nutanix".

3. Back up the

   install-config.yaml

   file so that you can use it to install multiple clusters.
   Important

   The

   install-config.yaml

   file is consumed during the installation process. If you want to reuse the file, you must back it up now.

Procedure

1. Create a YAML file that contains the credentials data in the following format:

   Credentials data format

   credentials:
   - type: basic_auth 

   1

   
     data:
       prismCentral: 

   2

   
         username: <username_for_prism_central>
         password: <password_for_prism_central>
       prismElements: 

   3

   
       - name: <name_of_prism_element>
         username: <username_for_prism_element>
         password: <password_for_prism_element>

   1

   Specify the authentication type. Only basic authentication is supported.

   2

   Specify the Prism Central credentials.

   3

   Optional: Specify the Prism Element credentials.

2. Set a

   $RELEASE_IMAGE

   variable with the release image from your installation file by running the following command:

   $ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')

3. Extract the list of

   CredentialsRequest

   custom resources (CRs) from the OpenShift Container Platform release image by running the following command:

   $ oc adm release extract \
     --from=$RELEASE_IMAGE \
     --credentials-requests \
     --included \

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     --install-config=<path_to_directory_with_installation_configuration>/install-config.yaml \

   2

   
     --to=<path_to_directory_for_credentials_requests> 

   3

   1

   The --included parameter includes only the manifests that your specific cluster configuration requires.

   2

   Specify the location of the install-config.yaml file.

   3

   Specify the path to the directory where you want to store the CredentialsRequest objects. If the specified directory does not exist, this command creates it.

   Sample CredentialsRequest object

     apiVersion: cloudcredential.openshift.io/v1
     kind: CredentialsRequest
     metadata:
       annotations:
         include.release.openshift.io/self-managed-high-availability: "true"
       labels:
         controller-tools.k8s.io: "1.0"
       name: openshift-machine-api-nutanix
       namespace: openshift-cloud-credential-operator
     spec:
       providerSpec:
         apiVersion: cloudcredential.openshift.io/v1
         kind: NutanixProviderSpec
       secretRef:
         name: nutanix-credentials
         namespace: openshift-machine-api

4. Use the

   ccoctl

   tool to process all

   CredentialsRequest

   objects by running the following command:

   $ ccoctl nutanix create-shared-secrets \
     --credentials-requests-dir=<path_to_credentials_requests_directory> \

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     --output-dir=<ccoctl_output_dir> \

   2

   
     --credentials-source-filepath=<path_to_credentials_file> 

   3

   1

   Specify the path to the directory that contains the files for the component CredentialsRequests objects.

   2

   Optional: Specify the directory in which you want the ccoctl utility to create objects. By default, the utility creates objects in the directory in which the commands are run.

   3

   Optional: Specify the directory that contains the credentials data YAML file. By default, ccoctl expects this file to be in <home_directory>/.nutanix/credentials.

5. Edit the

   install-config.yaml

   configuration file so that the

   credentialsMode

   parameter is set to

   Manual

   .

   Example install-config.yaml configuration file

   apiVersion: v1
   baseDomain: cluster1.example.com
   credentialsMode: Manual 

   1

   
   ...

   1

   Add this line to set the credentialsMode parameter to Manual.

6. Create the installation manifests by running the following command:

   $ openshift-install create manifests --dir <installation_directory> 

   1

   1

   Specify the path to the directory that contains the install-config.yaml file for your cluster.

7. Copy the generated credential files to the target manifests directory by running the following command:

   $ cp <ccoctl_output_dir>/manifests/*credentials.yaml ./<installation_directory>/manifests

Procedure

1. Navigate to the

   manifests

   directory:

   $ cd <path_to_installation_directory>/manifests

2. Create the

   cloud-conf

   ConfigMap

   file with the name

   openshift-cloud-controller-manager-cloud-config.yaml

   and add the following information:

   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: cloud-conf
     namespace: openshift-cloud-controller-manager
   data:
     cloud.conf: "{
         \"prismCentral\": {
             \"address\": \"<prism_central_FQDN/IP>\", 

   1

   
             \"port\": 9440,
               \"credentialRef\": {
                   \"kind\": \"Secret\",
                   \"name\": \"nutanix-credentials\",
                   \"namespace\": \"openshift-cloud-controller-manager\"
               }
          },
          \"topologyDiscovery\": {
              \"type\": \"Prism\",
              \"topologyCategories\": null
          },
          \"enableCustomLabeling\": true
        }"

   1

   Specify the Prism Central FQDN/IP.

3. Verify that the file

   cluster-infrastructure-02-config.yml

   exists and has the following information:

   spec:
     cloudConfig:
       key: config
       name: cloud-provider-config