Chapter 2. Installing a cluster quickly on RHV

Procedure

1. Check that the RHV version supports installation of OpenShift Container Platform version 4.12.

   1. In the RHV Administration Portal, click the ? help icon in the upper-right corner and select About.
   2. In the window that opens, make a note of the RHV Software Version.
   3. Confirm that the RHV version is 4.4. For more information about supported version combinations, see Support Matrix for OpenShift Container Platform on RHV.

2. Inspect the data center, cluster, and storage.

   1. In the RHV Administration Portal, click Compute Data Centers.
   2. Confirm that the data center where you plan to install OpenShift Container Platform is accessible.
   3. Click the name of that data center.
   4. In the data center details, on the Storage tab, confirm the storage domain where you plan to install OpenShift Container Platform is Active.
   5. Record the Domain Name for use later on.
   6. Confirm Free Space has at least 230 GiB.
   7. Confirm that the storage domain meets these etcd backend performance requirements, which you can measure by using the fio performance benchmarking tool.
   8. In the data center details, click the Clusters tab.
   9. Find the RHV cluster where you plan to install OpenShift Container Platform. Record the cluster name for use later on.

3. Inspect the RHV host resources.

   1. In the RHV Administration Portal, click Compute > Clusters.
   2. Click the cluster where you plan to install OpenShift Container Platform.
   3. In the cluster details, click the Hosts tab.
   4. Inspect the hosts and confirm they have a combined total of at least 28 Logical CPU Cores available exclusively for the OpenShift Container Platform cluster.
   5. Record the number of available Logical CPU Cores for use later on.
   6. Confirm that these CPU cores are distributed so that each of the seven virtual machines created during installation can have four cores.

   7. Confirm that, all together, the hosts have 112 GiB of Max free Memory for scheduling new virtual machines distributed to meet the requirements for each of the following OpenShift Container Platform machines:

      • 16 GiB required for the bootstrap machine
      • 16 GiB required for each of the three control plane machines
      • 16 GiB for each of the three compute machines
   8. Record the amount of Max free Memory for scheduling new virtual machines for use later on.

4. Verify that the virtual network for installing OpenShift Container Platform has access to the RHV Manager’s REST API. From a virtual machine on this network, use curl to reach the RHV Manager’s REST API:

   $ curl -k -u <username>@<profile>:<password> \ 1
   https://<engine-fqdn>/ovirt-engine/api 2

   1

   For <username>, specify the user name of an RHV account with privileges to create and manage an OpenShift Container Platform cluster on RHV. For <profile>, specify the login profile, which you can get by going to the RHV Administration Portal login page and reviewing the Profile dropdown list. For <password>, specify the password for that user name.

   2

   For <engine-fqdn>, specify the fully qualified domain name of the RHV environment.

   For example:

   $ curl -k -u ocpadmin@internal:pw123 \
   https://rhv-env.virtlab.example.com/ovirt-engine/api

Procedure

1. Reserve two static IP addresses

   1. On the network where you plan to install OpenShift Container Platform, identify two static IP addresses that are outside the DHCP lease pool.

   2. Connect to a host on this network and verify that each of the IP addresses is not in use. For example, use Address Resolution Protocol (ARP) to check that none of the IP addresses have entries:

      $ arp 10.35.1.19

      Example output

      10.35.1.19 (10.35.1.19) -- no entry

   3. Reserve two static IP addresses following the standard practices for your network environment.
   4. Record these IP addresses for future reference.

2. Create DNS entries for the OpenShift Container Platform REST API and apps domain names using this format:

   api.<cluster-name>.<base-domain>   <ip-address> 1
   *.apps.<cluster-name>.<base-domain>   <ip-address> 2

   1

   For <cluster-name>, <base-domain>, and <ip-address>, specify the cluster name, base domain, and static IP address of your OpenShift Container Platform API.

   2

   Specify the cluster name, base domain, and static IP address of your OpenShift Container Platform apps for Ingress and the load balancer.

   For example:

   api.my-cluster.virtlab.example.com	10.35.1.19
   *.apps.my-cluster.virtlab.example.com	10.35.1.20

Procedure

1. Create a file named ~/.ovirt/ovirt-config.yaml.

2. Add the following content to ovirt-config.yaml:

   ovirt_url: https://ovirt.example.com/ovirt-engine/api 1
   ovirt_fqdn: ovirt.example.com 2
   ovirt_pem_url: ""
   ovirt_username: ocpadmin@internal
   ovirt_password: super-secret-password 3
   ovirt_insecure: true

   1

   Specify the hostname or address of your oVirt engine.

   2

   Specify the fully qualified domain name of your oVirt engine.

   3

   Specify the admin password for your oVirt engine.

3. Run the installer.

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 FIPS validated or Modules In Process cryptographic libraries on 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. Access the Infrastructure Provider page on the OpenShift Cluster Manager site. If you have a Red Hat account, log in with your credentials. If you do not, create an account.
2. Select your infrastructure provider.

3. Navigate to the page for your installation type, download the installation program that corresponds with your host operating system and architecture, and place the file in the directory where you will 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 files are required to delete the cluster.

   Important

   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.

4. 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

5. Download your installation pull secret from the 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. Change to the directory that contains the installation program and initialize the cluster deployment:

   $ ./openshift-install create cluster --dir <installation_directory> \ 1
       --log-level=info 2

   1

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

   2

   To view different installation details, specify warn, debug, or error instead of info.

   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.

2. Respond to the installation program prompts.

   1. Optional: For SSH Public Key, select a password-less public key, such as ~/.ssh/id_rsa.pub. This key authenticates connections with the new OpenShift Container Platform cluster.

      Note

      For production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery, select an SSH key that your ssh-agent process uses.

   2. For Platform, select ovirt.

   3. For Engine FQDN[:PORT], enter the fully qualified domain name (FQDN) of the RHV environment.

      For example:

      rhv-env.virtlab.example.com:443

   4. The installation program automatically generates a CA certificate. For Would you like to use the above certificate to connect to the Manager?, answer y or N. If you answer N, you must install OpenShift Container Platform in insecure mode.

   5. For Engine username, enter the user name and profile of the RHV administrator using this format:

      <username>@<profile> 1

      1

      For <username>, specify the user name of an RHV administrator. For <profile>, specify the login profile, which you can get by going to the RHV Administration Portal login page and reviewing the Profile dropdown list. For example: admin@internal.

   6. For Engine password, enter the RHV admin password.
   7. For Cluster, select the RHV cluster for installing OpenShift Container Platform.
   8. For Storage domain, select the storage domain for installing OpenShift Container Platform.
   9. For Network, select a virtual network that has access to the RHV Manager REST API.
   10. For Internal API Virtual IP, enter the static IP address you set aside for the cluster’s REST API.
   11. For Ingress virtual IP, enter the static IP address you reserved for the wildcard apps domain.
   12. For Base Domain, enter the base domain of the OpenShift Container Platform cluster. If this cluster is exposed to the outside world, this must be a valid domain recognized by DNS infrastructure. For example, enter: virtlab.example.com
   13. For Cluster Name, enter the name of the cluster. For example, my-cluster. Use cluster name from the externally registered/resolvable DNS entries you created for the OpenShift Container Platform REST API and apps domain names. The installation program also gives this name to the cluster in the RHV environment.
   14. For Pull Secret, copy the pull secret from the pull-secret.txt file you downloaded earlier and paste it here. You can also get a copy of the same pull secret from the Red Hat OpenShift Cluster Manager.
   Note

   If the cloud provider account that you configured on your host does not have sufficient permissions to deploy the cluster, the installation process stops, and the missing permissions are displayed.

Procedure

1. Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
2. Select the architecture from the Product Variant drop-down list.
3. Select the appropriate version from the Version drop-down list.
4. Click Download Now next to the OpenShift v4.12 Linux Client entry and save the file.

5. Unpack the archive:

   $ tar xvf <file>

6. Place the oc binary in a directory that is on your PATH.

   To check your PATH, execute the following command:

   $ echo $PATH

Procedure

1. Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
2. Select the appropriate version from the Version drop-down list.
3. Click Download Now next to the OpenShift v4.12 Windows Client entry and save the file.
4. Unzip the archive with a ZIP program.

5. Move the oc binary to a directory that is on your PATH.

   To check your PATH, open the command prompt and execute the following command:

   C:\> path

Procedure

1. Navigate to the OpenShift Container Platform downloads page on the Red Hat Customer Portal.
2. Select the appropriate version from the Version drop-down list.

3. Click Download Now next to the OpenShift v4.12 macOS Client entry and save the file.

   Note

   For macOS arm64, choose the OpenShift v4.12 macOS arm64 Client entry.

4. Unpack and unzip the archive.

5. Move the oc binary to a directory on your PATH.

   To check your PATH, open a terminal and execute the following command:

   $ echo $PATH

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

Procedure

1. In the cluster environment, export the administrator’s kubeconfig file:

   $ export KUBECONFIG=<installation_directory>/auth/kubeconfig 1

   1

   For <installation_directory>, specify the path to the directory that you stored the installation files in.

   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.

2. View the control plane and compute machines created after a deployment:

   $ oc get nodes

3. View your cluster’s version:

   $ oc get clusterversion

4. View your Operators' status:

   $ oc get clusteroperator

5. View all running pods in the cluster:

   $ oc get pods -A

Procedure

1. Optional: In the Red Hat Virtualization (RHV) Administration Portal, open Compute Cluster.
2. Verify that the installation program creates the virtual machines.
3. Return to the command line where the installation program is running. When the installation program finishes, it displays the user name and temporary password for logging into the OpenShift Container Platform web console.

4. In a browser, open the URL of the OpenShift Container Platform web console. The URL uses this format:

   console-openshift-console.apps.<clustername>.<basedomain> 1

   1

   For <clustername>.<basedomain>, specify the cluster name and base domain.

   For example:

   console-openshift-console.apps.my-cluster.virtlab.example.com