$ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> (1)
In OpenShift Container Platform version 4.11, you can install a cluster into an existing Virtual Private Cloud (VPC) on Google Cloud Platform (GCP). The installation program provisions the rest of the required infrastructure, which you can further customize. To customize the installation, you modify
parameters in the
install-config.yaml file before you install the cluster.
You reviewed details about the OpenShift Container Platform installation and update processes.
You read the documentation on selecting a cluster installation method and preparing it for users.
You configured a GCP project to host the cluster.
If you use a firewall, you configured it to allow the sites that your cluster requires access to.
If the cloud identity and access management (IAM) APIs are not accessible in your environment, or if you do not want to store an administrator-level credential secret in the
kube-system namespace, you can manually create and maintain IAM credentials.
In OpenShift Container Platform 4.11, you can deploy a cluster into existing subnets in an existing Virtual Private Cloud (VPC) in Google Cloud Platform (GCP). By deploying OpenShift Container Platform into an existing GCP VPC, you might be able to avoid limit constraints in new accounts or more easily abide by the operational constraints that your company’s guidelines set. If you cannot obtain the infrastructure creation permissions that are required to create the VPC yourself, use this installation option. You must configure networking for the subnets.
The union of the VPC CIDR block and the machine network CIDR must be non-empty. The subnets must be within the machine network.
The installation program does not create the following components:
The installation program requires that you use the cloud-provided DNS server. Using a custom DNS server is not supported and causes the installation to fail.
To ensure that the subnets that you provide are suitable, the installation program confirms the following data:
All the subnets that you specify exist.
You provide one subnet for control-plane machines and one subnet for compute machines.
The subnet’s CIDRs belong to the machine CIDR that you specified.
Some individuals can create different resource in your clouds than others. For example, you might be able to create application-specific items, like instances, buckets, and load balancers, but not networking-related components such as VPCs, subnets, or ingress rules.
If you deploy OpenShift Container Platform to an existing network, the isolation of cluster services is reduced in the following ways:
You can install multiple OpenShift Container Platform clusters in the same VPC.
ICMP ingress is allowed to the entire network.
TCP 22 ingress (SSH) is allowed to the entire network.
Control plane TCP 6443 ingress (Kubernetes API) is allowed to the entire network.
Control plane TCP 22623 ingress (MCS) is allowed to the entire network.
In OpenShift Container Platform 4.11, you require access to the internet to install your cluster.
You must have internet access to:
Access OpenShift Cluster Manager Hybrid Cloud Console 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.
During an OpenShift Container Platform installation, you can provide an SSH public key to the installation program. The key is passed to the Red Hat Enterprise Linux CoreOS (RHCOS) nodes through their Ignition config files and is used to authenticate SSH access to the nodes. The key is added to the
~/.ssh/authorized_keys list for the
core user on each node, which enables password-less authentication.
After the key is passed to the nodes, you can use the key pair to SSH in to the RHCOS nodes as the user
core. To access the nodes through SSH, the private key identity must be managed by SSH for your local user.
If you want to SSH in to your cluster nodes to perform installation debugging or disaster recovery, you must provide the SSH public key during the installation process. The
./openshift-install gather command also requires the SSH public key to be in place on the cluster nodes.
Do not skip this procedure in production environments, where disaster recovery and debugging is required.
You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs.
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
If you plan to install an OpenShift Container Platform cluster that uses FIPS Validated / Modules in Process cryptographic libraries on the
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
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.
On some distributions, default SSH private key identities such as
ssh-agent process is not already running for your local user, start it as a background task:
$ eval "$(ssh-agent -s)"
Agent pid 31874
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.
Add your SSH private key to the
$ ssh-add <path>/<file_name> (1)
|1||Specify the path and file name for your SSH private key, such as
Identity added: /home/<you>/<path>/<file_name> (<computer_name>)
GOOGLE_APPLICATION_CREDENTIALS environment variable to the full path to your service account private key file.
$ export GOOGLE_APPLICATION_CREDENTIALS="<your_service_account_file>"
Verify that the credentials were applied.
$ gcloud auth list
When you install OpenShift Container Platform, provide the SSH public key to the installation program.
Before you install OpenShift Container Platform, download the installation file on a local computer.
You have a computer that runs Linux or macOS, with 500 MB of local disk space
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.
Select your infrastructure provider.
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.
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.
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.
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
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.
You can customize the OpenShift Container Platform cluster you install on Google Cloud Platform (GCP).
Obtain the OpenShift Container Platform installation program and the pull secret for your cluster.
Obtain service principal permissions at the subscription level.
Change to the directory that contains the installation program and run the following command:
$ ./openshift-install create install-config --dir <installation_directory> (1)
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.
At the prompts, provide the configuration details for your cloud:
Optional: Select an SSH key to use to access your cluster machines.
For production OpenShift Container Platform clusters on which you want to perform installation debugging or disaster recovery, specify an SSH key that your
Select gcp as the platform to target.
If you have not configured the service account key for your GCP account on your computer, you must obtain it from GCP and paste the contents of the file or enter the absolute path to the file.
Select the project ID to provision the cluster in. The default value is specified by the service account that you configured.
Select the region to deploy the cluster to.
Select the base domain to deploy the cluster to. The base domain corresponds to the public DNS zone that you created for your cluster.
Enter a descriptive name for your cluster.
install-config.yaml file. You can find more information about
the available parameters in the "Installation configuration parameters" section.
Back up the
install-config.yaml file so that you can use
it to install multiple clusters.