Installing a cluster on GCP into an existing VPC

In OKD version 4, 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.

Prerequisites

About using a custom VPC

In OKD 4, you can deploy a cluster into existing subnets in an existing Virtual Private Cloud (VPC) in Google Cloud Platform (GCP). By deploying OKD 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.

Requirements for using your VPC

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:

  • NAT gateways

  • Subnets

  • Route tables

  • VPC network

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.

VPC validation

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.

Division of permissions

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.

Isolation between clusters

If you deploy OKD to an existing network, the isolation of cluster services is reduced in the following ways:

  • You can install multiple OKD 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.

Generating a key pair for cluster node SSH access

During an OKD installation, you can provide an SSH public key to the installation program. The key is passed to the Fedora CoreOS (FCOS) 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 FCOS 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.

On clusters running Fedora CoreOS (FCOS), the SSH keys specified in the Ignition config files are written to the /home/core/.ssh/authorized_keys.d/core file. However, the Machine Config Operator manages SSH keys in the /home/core/.ssh/authorized_keys file and configures sshd to ignore the /home/core/.ssh/authorized_keys.d/core file. As a result, newly provisioned OKD nodes are not accessible using SSH until the Machine Config Operator reconciles the machine configs with the authorized_keys file. After you can access the nodes using SSH, you can delete the /home/core/.ssh/authorized_keys.d/core file.

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:

    1. $ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> (1)
    1Specify 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.

    If you plan to install an OKD cluster that uses the Fedora 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:

    1. $ cat <path>/<file_name>.pub

    For example, run the following to view the ~/.ssh/id_ed25519.pub public key:

    1. $ 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.

    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:

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

      Example output

      1. 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.

  4. Add your SSH private key to the ssh-agent:

    1. $ ssh-add <path>/<file_name> (1)
    1Specify the path and file name for your SSH private key, such as ~/.ssh/id_ed25519

    Example output

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

Next steps

  • When you install OKD, provide the SSH public key to the installation program.

Obtaining the installation program

Before you install OKD, download the installation file on the host you are using for installation.

Prerequisites

  • You have a computer that runs Linux or macOS, with 500 MB of local disk space.

Procedure

  1. Download installer from https://github.com/openshift/okd/releases

    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 OKD uninstallation procedures for your specific cloud provider.

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

    1. $ tar -xvf openshift-install-linux.tar.gz
  3. 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 OKD components.

    Using a pull secret from the Red Hat OpenShift Cluster Manager is not required. You can use a pull secret for another private registry. Or, if you do not need the cluster to pull images from a private registry, you can use {"auths":{"fake":{"auth":"aWQ6cGFzcwo="}}} as the pull secret when prompted during the installation.

    If you do not use the pull secret from the Red Hat OpenShift Cluster Manager:

    • Red Hat Operators are not available.

    • The Telemetry and Insights operators do not send data to Red Hat.

    • Content from the Red Hat Ecosystem Catalog Container images registry, such as image streams and Operators, are not available.

Creating the installation configuration file

You can customize the OKD cluster you install on Google Cloud Platform (GCP).

Prerequisites

  • You have the OKD installation program and the pull secret for your cluster.

Procedure

  1. Create the install-config.yaml file.

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

      1. $ ./openshift-install create install-config --dir <installation_directory> (1)
      1For <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 OKD version.

        Always delete the ~/.powervs directory to avoid reusing a stale configuration. Run the following command:

        1. $ 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.

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

      2. Select gcp as the platform to target.

      3. 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.

      4. Select the project ID to provision the cluster in. The default value is specified by the service account that you configured.

      5. Select the region to deploy the cluster to.

      6. Select the base domain to deploy the cluster to. The base domain corresponds to the public DNS zone that you created for your cluster.

      7. Enter a descriptive name for your cluster.

  1. Modify the install-config.yaml file. You can find more information about the available parameters in the “Installation configuration parameters” section.

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

Additional resources

Minimum resource requirements for cluster installation

Each cluster machine must meet the following minimum requirements:

Table 1. Minimum resource requirements
MachineOperating SystemvCPU [1]Virtual RAMStorageInput/Output Per Second (IOPS)[2]

Bootstrap

FCOS

4

16 GB

100 GB

300

Control plane

FCOS

4

16 GB

100 GB

300

Compute

FCOS

2

8 GB

100 GB

300

  1. One vCPU is equivalent to one physical core when simultaneous multithreading (SMT), or hyperthreading, is not enabled. When enabled, use the following formula to calculate the corresponding ratio: (threads per core × cores) × sockets = vCPUs.

  2. OKD and Kubernetes are sensitive to disk performance, and faster storage is recommended, particularly for etcd on the control plane nodes which require a 10 ms p99 fsync duration. Note that on many cloud platforms, storage size and IOPS scale together, so you might need to over-allocate storage volume to obtain sufficient performance.

  3. As with all user-provisioned installations, if you choose to use Fedora compute machines in your cluster, you take responsibility for all operating system life cycle management and maintenance, including performing system updates, applying patches, and completing all other required tasks. Use of Fedora 7 compute machines is deprecated and has been removed in OKD 4.10 and later.

If an instance type for your platform meets the minimum requirements for cluster machines, it is supported to use in OKD.

Additional resources

Tested instance types for GCP

The following Google Cloud Platform instance types have been tested with OKD.

Machine series

  • C2

  • C2D

  • C3

  • E2

  • M1

  • N1

  • N2

  • N2D

  • Tau T2D

Tested instance types for GCP on 64-bit ARM infrastructures

The following Google Cloud Platform (GCP) 64-bit ARM instance types have been tested with OKD.

Machine series for 64-bit ARM machines

  • Tau T2A

Using custom machine types

Using a custom machine type to install a OKD cluster is supported.

Consider the following when using a custom machine type:

  • Similar to predefined instance types, custom machine types must meet the minimum resource requirements for control plane and compute machines. For more information, see “Minimum resource requirements for cluster installation”.

  • The name of the custom machine type must adhere to the following syntax:

    custom-<number_of_cpus>-<amount_of_memory_in_mb>

    For example, custom-6-20480.

As part of the installation process, you specify the custom machine type in the install-config.yaml file.

Sample install-config.yaml file with a custom machine type

  1. compute:
  2. - architecture: amd64
  3. hyperthreading: Enabled
  4. name: worker
  5. platform:
  6. gcp:
  7. type: custom-6-20480
  8. replicas: 2
  9. controlPlane:
  10. architecture: amd64
  11. hyperthreading: Enabled
  12. name: master
  13. platform:
  14. gcp:
  15. type: custom-6-20480
  16. replicas: 3

Enabling Shielded VMs

You can use Shielded VMs when installing your cluster. Shielded VMs have extra security features including secure boot, firmware and integrity monitoring, and rootkit detection. For more information, see Google’s documentation on Shielded VMs.

Shielded VMs are currently not supported on clusters with 64-bit ARM infrastructures.

Prerequisites

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

Procedure

  • Use a text editor to edit the install-config.yaml file prior to deploying your cluster and add one of the following stanzas:

    1. To use shielded VMs for only control plane machines:

      1. controlPlane:
      2. platform:
      3. gcp:
      4. secureBoot: Enabled
    2. To use shielded VMs for only compute machines:

      1. compute:
      2. - platform:
      3. gcp:
      4. secureBoot: Enabled
    3. To use shielded VMs for all machines:

      1. platform:
      2. gcp:
      3. defaultMachinePlatform:
      4. secureBoot: Enabled

Enabling Confidential VMs

You can use Confidential VMs when installing your cluster. Confidential VMs encrypt data while it is being processed. For more information, see Google’s documentation on Confidential Computing. You can enable Confidential VMs and Shielded VMs at the same time, although they are not dependent on each other.

Confidential VMs are currently not supported on 64-bit ARM architectures.

Prerequisites

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

Procedure

  • Use a text editor to edit the install-config.yaml file prior to deploying your cluster and add one of the following stanzas:

    1. To use confidential VMs for only control plane machines:

      1. controlPlane:
      2. platform:
      3. gcp:
      4. confidentialCompute: Enabled (1)
      5. type: n2d-standard-8 (2)
      6. onHostMaintenance: Terminate (3)
      1Enable confidential VMs.
      2Specify a machine type that supports Confidential VMs. Confidential VMs require the N2D or C2D series of machine types. For more information on supported machine types, see Supported operating systems and machine types.
      3Specify the behavior of the VM during a host maintenance event, such as a hardware or software update. For a machine that uses Confidential VM, this value must be set to Terminate, which stops the VM. Confidential VMs do not support live VM migration.
    2. To use confidential VMs for only compute machines:

      1. compute:
      2. - platform:
      3. gcp:
      4. confidentialCompute: Enabled
      5. type: n2d-standard-8
      6. onHostMaintenance: Terminate
    3. To use confidential VMs for all machines:

      1. platform:
      2. gcp:
      3. defaultMachinePlatform:
      4. confidentialCompute: Enabled
      5. type: n2d-standard-8
      6. onHostMaintenance: Terminate

Sample customized install-config.yaml file for GCP

You can customize the install-config.yaml file to specify more details about your OKD cluster’s platform or modify the values of the required parameters.

This sample YAML file is provided for reference only. You must obtain your install-config.yaml file by using the installation program and modify it.

  1. apiVersion: v1
  2. baseDomain: example.com (1)
  3. credentialsMode: Mint (2)
  4. controlPlane: (3) (4)
  5. hyperthreading: Enabled (5)
  6. name: master
  7. platform:
  8. gcp:
  9. type: n2-standard-4
  10. zones:
  11. - us-central1-a
  12. - us-central1-c
  13. osDisk:
  14. diskType: pd-ssd
  15. diskSizeGB: 1024
  16. encryptionKey: (6)
  17. kmsKey:
  18. name: worker-key
  19. keyRing: test-machine-keys
  20. location: global
  21. projectID: project-id
  22. tags: (7)
  23. - control-plane-tag1
  24. - control-plane-tag2
  25. osImage: (8)
  26. project: example-project-name
  27. name: example-image-name
  28. replicas: 3
  29. compute: (3) (4)
  30. - hyperthreading: Enabled (5)
  31. name: worker
  32. platform:
  33. gcp:
  34. type: n2-standard-4
  35. zones:
  36. - us-central1-a
  37. - us-central1-c
  38. osDisk:
  39. diskType: pd-standard
  40. diskSizeGB: 128
  41. encryptionKey: (6)
  42. kmsKey:
  43. name: worker-key
  44. keyRing: test-machine-keys
  45. location: global
  46. projectID: project-id
  47. tags: (7)
  48. - compute-tag1
  49. - compute-tag2
  50. osImage: (8)
  51. project: example-project-name
  52. name: example-image-name
  53. replicas: 3
  54. metadata:
  55. name: test-cluster (1)
  56. networking:
  57. clusterNetwork:
  58. - cidr: 10.128.0.0/14
  59. hostPrefix: 23
  60. machineNetwork:
  61. - cidr: 10.0.0.0/16
  62. networkType: OVNKubernetes (9)
  63. serviceNetwork:
  64. - 172.30.0.0/16
  65. platform:
  66. gcp:
  67. projectID: openshift-production (1)
  68. region: us-central1 (1)
  69. defaultMachinePlatform:
  70. tags: (7)
  71. - global-tag1
  72. - global-tag2
  73. osImage: (8)
  74. project: example-project-name
  75. name: example-image-name
  76. network: existing_vpc (10)
  77. controlPlaneSubnet: control_plane_subnet (11)
  78. computeSubnet: compute_subnet (12)
  79. pullSecret: '{"auths": ...}' (1)
  80. sshKey: ssh-ed25519 AAAA... (13)
1Required. The installation program prompts you for this value.
2Optional: Add this parameter to force the Cloud Credential Operator (CCO) to use the specified mode. By default, the CCO uses the root credentials in the kube-system namespace to dynamically try to determine the capabilities of the credentials. For details about CCO modes, see the “About the Cloud Credential Operator” section in the Authentication and authorization guide.
3If you do not provide these parameters and values, the installation program provides the default value.
4The 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. Only one control plane pool is used.
5Whether to enable or disable simultaneous multithreading, or hyperthreading. By default, simultaneous multithreading is enabled to increase the performance of your machines’ cores. You can disable it by setting the parameter value to Disabled. If you disable simultaneous multithreading in some cluster machines, you must disable it in all cluster machines.

If you disable simultaneous multithreading, ensure that your capacity planning accounts for the dramatically decreased machine performance. Use larger machine types, such as n1-standard-8, for your machines if you disable simultaneous multithreading.

6Optional: The custom encryption key section to encrypt both virtual machines and persistent volumes. Your default compute service account must have the permissions granted to use your KMS key and have the correct IAM role assigned. The default service account name follows the service-<project_number>@compute-system.iam.gserviceaccount.com pattern. For more information about granting the correct permissions for your service account, see “Machine management” → “Creating compute machine sets” → “Creating a compute machine set on GCP”.
7Optional: A set of network tags to apply to the control plane or compute machine sets. The platform.gcp.defaultMachinePlatform.tags parameter will apply to both control plane and compute machines. If the compute.platform.gcp.tags or controlPlane.platform.gcp.tags parameters are set, they override the platform.gcp.defaultMachinePlatform.tags parameter.
8Optional: A custom Fedora CoreOS (FCOS) that should be used to boot control plane and compute machines. The project and name parameters under platform.gcp.defaultMachinePlatform.osImage apply to both control plane and compute machines. If the project and name parameters under controlPlane.platform.gcp.osImage or compute.platform.gcp.osImage are set, they override the platform.gcp.defaultMachinePlatform.osImage parameters.
9The cluster network plugin to install. The supported values are OVNKubernetes and OpenShiftSDN. The default value is OVNKubernetes.
10Specify the name of an existing VPC.
11Specify the name of the existing subnet to deploy the control plane machines to. The subnet must belong to the VPC that you specified.
12Specify the name of the existing subnet to deploy the compute machines to. The subnet must belong to the VPC that you specified.
13You can optionally provide the sshKey value that you use to access the machines in your cluster.

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

Create an Ingress Controller with global access on GCP

You can create an Ingress Controller that has global access to a Google Cloud Platform (GCP) cluster. Global access is only available to Ingress Controllers using internal load balancers.

Prerequisites

  • You created the install-config.yaml and complete any modifications to it.

Procedure

Create an Ingress Controller with global access on a new GCP cluster.

  1. Change to the directory that contains the installation program and create a manifest file:

    1. $ ./openshift-install create manifests --dir <installation_directory> (1)
    1For <installation_directory>, specify the name of the directory that contains the install-config.yaml file for your cluster.
  2. Create a file that is named cluster-ingress-default-ingresscontroller.yaml in the <installation_directory>/manifests/ directory:

    1. $ touch <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml (1)
    1For <installation_directory>, specify the directory name that contains the manifests/ directory for your cluster.

    After creating the file, several network configuration files are in the manifests/ directory, as shown:

    1. $ ls <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml

    Example output

    1. cluster-ingress-default-ingresscontroller.yaml
  3. Open the cluster-ingress-default-ingresscontroller.yaml file in an editor and enter a custom resource (CR) that describes the Operator configuration you want:

    Sample clientAccess configuration to Global

    1. apiVersion: operator.openshift.io/v1
    2. kind: IngressController
    3. metadata:
    4. name: default
    5. namespace: openshift-ingress-operator
    6. spec:
    7. endpointPublishingStrategy:
    8. loadBalancer:
    9. providerParameters:
    10. gcp:
    11. clientAccess: Global (1)
    12. type: GCP
    13. scope: Internal (2)
    14. type: LoadBalancerService
    1Set gcp.clientAccess to Global.
    2Global access is only available to Ingress Controllers using internal load balancers.

Additional resources

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 OKD 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 OpenStack, 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:

    1. apiVersion: v1
    2. baseDomain: my.domain.com
    3. proxy:
    4. httpProxy: http://<username>:<pswd>@<ip>:<port> (1)
    5. httpsProxy: https://<username>:<pswd>@<ip>:<port> (2)
    6. noProxy: example.com (3)
    7. additionalTrustBundle: | (4)
    8. -----BEGIN CERTIFICATE-----
    9. <MY_TRUSTED_CA_CERT>
    10. -----END CERTIFICATE-----
    11. additionalTrustBundlePolicy: <policy_to_add_additionalTrustBundle> (5)
    1A proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be http.
    2A proxy URL to use for creating HTTPS connections outside the cluster.
    3A 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.
    4If provided, the installation program generates a config map that is named user-ca-bundle in the openshift-config namespace to hold the additional CA certificates. If you provide additionalTrustBundle and at least one proxy setting, the Proxy object is configured to reference the user-ca-bundle config map in the trustedCA field. The Cluster Network Operator then creates a trusted-ca-bundle config map that merges the contents specified for the trustedCA parameter with the FCOS trust bundle. The additionalTrustBundle field is required unless the proxy’s identity certificate is signed by an authority from the FCOS trust bundle.
    5Optional: 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:

    1. $ ./openshift-install wait-for install-complete log-level debug
  2. Save the file and reference it when installing OKD.

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.

Installing the OpenShift CLI by downloading the binary

You can install the OpenShift CLI (oc) to interact with OKD from a command-line interface. You can install oc on Linux, Windows, or macOS.

If you installed an earlier version of oc, you cannot use it to complete all of the commands in OKD 4. Download and install the new version of oc.

Installing the OpenShift CLI on Linux

You can install the OpenShift CLI (oc) binary on Linux by using the following procedure.

Procedure

  1. Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.

  2. Download oc.tar.gz.

  3. Unpack the archive:

    1. $ tar xvf <file>
  4. Place the oc binary in a directory that is on your PATH.

    To check your PATH, execute the following command:

    1. $ echo $PATH

Verification

  • After you install the OpenShift CLI, it is available using the oc command:

    1. $ oc <command>

Installing the OpenShift CLI on Windows

You can install the OpenShift CLI (oc) binary on Windows by using the following procedure.

Procedure

  1. Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.

  2. Download oc.zip.

  3. Unzip the archive with a ZIP program.

  4. 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:

    1. C:\> path

Verification

  • After you install the OpenShift CLI, it is available using the oc command:

    1. C:\> oc <command>

Installing the OpenShift CLI on macOS

You can install the OpenShift CLI (oc) binary on macOS by using the following procedure.

Procedure

  1. Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.

  2. Download oc.tar.gz.

  3. Unpack and unzip the archive.

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

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

    1. $ echo $PATH

Verification

  • After you install the OpenShift CLI, it is available using the oc command:

    1. $ oc <command>

Alternatives to storing administrator-level secrets in the kube-system project

By default, administrator secrets are stored in the kube-system project. If you configured the credentialsMode parameter in the install-config.yaml file to Manual, you must use one of the following alternatives:

Manually creating long-term credentials

The Cloud Credential Operator (CCO) can be put into manual mode prior to installation in environments where the cloud identity and access management (IAM) APIs are not reachable, or the administrator prefers not to store an administrator-level credential secret in the cluster kube-system namespace.

Procedure

  1. If you did not set the credentialsMode parameter in the install-config.yaml configuration file to Manual, modify the value as shown:

    Sample configuration file snippet

    1. apiVersion: v1
    2. baseDomain: example.com
    3. credentialsMode: Manual
    4. # ...
  2. If you have not previously created installation manifest files, do so by running the following command:

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

    where <installation_directory> is the directory in which the installation program creates files.

  3. Set a $RELEASE_IMAGE variable with the release image from your installation file by running the following command:

    1. $ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
  4. Extract the list of CredentialsRequest custom resources (CRs) from the OKD release image by running the following command:

    1. $ oc adm release extract \
    2. --from=$RELEASE_IMAGE \
    3. --credentials-requests \
    4. --included \(1)
    5. --install-config=<path_to_directory_with_installation_configuration>/install-config.yaml \(2)
    6. --to=<path_to_directory_for_credentials_requests> (3)
    1The —included parameter includes only the manifests that your specific cluster configuration requires.
    2Specify the location of the install-config.yaml file.
    3Specify the path to the directory where you want to store the CredentialsRequest objects. If the specified directory does not exist, this command creates it.

    This command creates a YAML file for each CredentialsRequest object.

    Sample CredentialsRequest object

    1. apiVersion: cloudcredential.openshift.io/v1
    2. kind: CredentialsRequest
    3. metadata:
    4. name: <component_credentials_request>
    5. namespace: openshift-cloud-credential-operator
    6. ...
    7. spec:
    8. providerSpec:
    9. apiVersion: cloudcredential.openshift.io/v1
    10. kind: GCPProviderSpec
    11. predefinedRoles:
    12. - roles/storage.admin
    13. - roles/iam.serviceAccountUser
    14. skipServiceCheck: true
    15. ...
  5. Create YAML files for secrets in the openshift-install manifests directory that you generated previously. The secrets must be stored using the namespace and secret name defined in the spec.secretRef for each CredentialsRequest object.

    Sample CredentialsRequest object with secrets

    1. apiVersion: cloudcredential.openshift.io/v1
    2. kind: CredentialsRequest
    3. metadata:
    4. name: <component_credentials_request>
    5. namespace: openshift-cloud-credential-operator
    6. ...
    7. spec:
    8. providerSpec:
    9. apiVersion: cloudcredential.openshift.io/v1
    10. ...
    11. secretRef:
    12. name: <component_secret>
    13. namespace: <component_namespace>
    14. ...

    Sample Secret object

    1. apiVersion: v1
    2. kind: Secret
    3. metadata:
    4. name: <component_secret>
    5. namespace: <component_namespace>
    6. data:
    7. service_account.json: <base64_encoded_gcp_service_account_file>

Before upgrading a cluster that uses manually maintained credentials, you must ensure that the CCO is in an upgradeable state.

Configuring a GCP cluster to use short-term credentials

To install a cluster that is configured to use GCP Workload Identity, you must configure the CCO utility and create the required GCP resources for your cluster.

Configuring the Cloud Credential Operator utility

To create and manage cloud credentials from outside of the cluster when the Cloud Credential Operator (CCO) is operating in manual mode, extract and prepare the CCO utility (ccoctl) binary.

The ccoctl utility is a Linux binary that must run in a Linux environment.

Prerequisites

  • You have access to an OKD account with cluster administrator access.

  • You have installed the OpenShift CLI (oc).

Procedure

  1. Obtain the OKD release image by running the following command:

    1. $ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
  2. Obtain the CCO container image from the OKD release image by running the following command:

    1. $ CCO_IMAGE=$(oc adm release info --image-for='cloud-credential-operator' $RELEASE_IMAGE -a ~/.pull-secret)

    Ensure that the architecture of the $RELEASE_IMAGE matches the architecture of the environment in which you will use the ccoctl tool.

  3. Extract the ccoctl binary from the CCO container image within the OKD release image by running the following command:

    1. $ oc image extract $CCO_IMAGE --file="/usr/bin/ccoctl" -a ~/.pull-secret
  4. Change the permissions to make ccoctl executable by running the following command:

    1. $ chmod 775 ccoctl

Verification

  • To verify that ccoctl is ready to use, display the help file by running the following command:

    1. $ ccoctl --help

    Output of ccoctl --help

    1. OpenShift credentials provisioning tool
    2. Usage:
    3. ccoctl [command]
    4. Available Commands:
    5. alibabacloud Manage credentials objects for alibaba cloud
    6. aws Manage credentials objects for AWS cloud
    7. azure Manage credentials objects for Azure
    8. gcp Manage credentials objects for Google cloud
    9. help Help about any command
    10. ibmcloud Manage credentials objects for IBM Cloud
    11. nutanix Manage credentials objects for Nutanix
    12. Flags:
    13. -h, --help help for ccoctl
    14. Use "ccoctl [command] --help" for more information about a command.

Creating GCP resources with the Cloud Credential Operator utility

You can use the ccoctl gcp create-all command to automate the creation of GCP resources.

By default, ccoctl creates objects in the directory in which the commands are run. To create the objects in a different directory, use the —output-dir flag. This procedure uses <path_to_ccoctl_output_dir> to refer to this directory.

Prerequisites

You must have:

  • Extracted and prepared the ccoctl binary.

Procedure

  1. Set a $RELEASE_IMAGE variable with the release image from your installation file by running the following command:

    1. $ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
  2. Extract the list of CredentialsRequest objects from the OKD release image by running the following command:

    1. $ oc adm release extract \
    2. --from=$RELEASE_IMAGE \
    3. --credentials-requests \
    4. --included \(1)
    5. --install-config=<path_to_directory_with_installation_configuration>/install-config.yaml \(2)
    6. --to=<path_to_directory_for_credentials_requests> (3)
    1The —included parameter includes only the manifests that your specific cluster configuration requires.
    2Specify the location of the install-config.yaml file.
    3Specify the path to the directory where you want to store the CredentialsRequest objects. If the specified directory does not exist, this command creates it.

    This command might take a few moments to run.

  3. Use the ccoctl tool to process all CredentialsRequest objects by running the following command:

    1. $ ccoctl gcp create-all \
    2. --name=<name> \(1)
    3. --region=<gcp_region> \(2)
    4. --project=<gcp_project_id> \(3)
    5. --credentials-requests-dir=<path_to_credentials_requests_directory> (4)
    1Specify the user-defined name for all created GCP resources used for tracking.
    2Specify the GCP region in which cloud resources will be created.
    3Specify the GCP project ID in which cloud resources will be created.
    4Specify the directory containing the files of CredentialsRequest manifests to create GCP service accounts.

    If your cluster uses Technology Preview features that are enabled by the TechPreviewNoUpgrade feature set, you must include the —enable-tech-preview parameter.

Verification

  • To verify that the OKD secrets are created, list the files in the <path_to_ccoctl_output_dir>/manifests directory:

    1. $ ls <path_to_ccoctl_output_dir>/manifests

    Example output

    1. cluster-authentication-02-config.yaml
    2. openshift-cloud-controller-manager-gcp-ccm-cloud-credentials-credentials.yaml
    3. openshift-cloud-credential-operator-cloud-credential-operator-gcp-ro-creds-credentials.yaml
    4. openshift-cloud-network-config-controller-cloud-credentials-credentials.yaml
    5. openshift-cluster-api-capg-manager-bootstrap-credentials-credentials.yaml
    6. openshift-cluster-csi-drivers-gcp-pd-cloud-credentials-credentials.yaml
    7. openshift-image-registry-installer-cloud-credentials-credentials.yaml
    8. openshift-ingress-operator-cloud-credentials-credentials.yaml
    9. openshift-machine-api-gcp-cloud-credentials-credentials.yaml

    You can verify that the IAM service accounts are created by querying GCP. For more information, refer to GCP documentation on listing IAM service accounts.

Incorporating the Cloud Credential Operator utility manifests

To implement short-term security credentials managed outside the cluster for individual components, you must move the manifest files that the Cloud Credential Operator utility (ccoctl) created to the correct directories for the installation program.

Prerequisites

  • You have configured an account with the cloud platform that hosts your cluster.

  • You have configured the Cloud Credential Operator utility (ccoctl).

  • You have created the cloud provider resources that are required for your cluster with the ccoctl utility.

Procedure

  1. If you did not set the credentialsMode parameter in the install-config.yaml configuration file to Manual, modify the value as shown:

    Sample configuration file snippet

    1. apiVersion: v1
    2. baseDomain: example.com
    3. credentialsMode: Manual
    4. # ...
  2. If you have not previously created installation manifest files, do so by running the following command:

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

    where <installation_directory> is the directory in which the installation program creates files.

  3. Copy the manifests that the ccoctl utility generated to the manifests directory that the installation program created by running the following command:

    1. $ cp /<path_to_ccoctl_output_dir>/manifests/* ./manifests/
  4. Copy the private key that the ccoctl utility generated in the tls directory to the installation directory by running the following command:

    1. $ cp -a /<path_to_ccoctl_output_dir>/tls .

Deploying the cluster

You can install OKD on a compatible cloud platform.

You can run the create cluster command of the installation program only once, during initial installation.

Prerequisites

  • You have configured an account with the cloud platform that hosts your cluster.

  • You have the OKD installation program and the pull secret for your cluster.

  • You have verified that the cloud provider account on your host has the correct permissions to deploy the cluster. An account with incorrect permissions causes the installation process to fail with an error message that displays the missing permissions.

Procedure

  1. Remove any existing GCP credentials that do not use the service account key for the GCP account that you configured for your cluster and that are stored in the following locations:

    • The GOOGLE_CREDENTIALS, GOOGLE_CLOUD_KEYFILE_JSON, or GCLOUD_KEYFILE_JSON environment variables

    • The ~/.gcp/osServiceAccount.json file

    • The gcloud cli default credentials

  2. Change to the directory that contains the installation program and initialize the cluster deployment:

    1. $ ./openshift-install create cluster --dir <installation_directory> \ (1)
    2. --log-level=info (2)
    1For <installation_directory>, specify the location of your customized ./install-config.yaml file.
    2To view different installation details, specify warn, debug, or error instead of info.
  3. Optional: You can reduce the number of permissions for the service account that you used to install the cluster.

    • If you assigned the Owner role to your service account, you can remove that role and replace it with the Viewer role.

    • If you included the Service Account Key Admin role, you can remove it.

Verification

When the cluster deployment completes successfully:

  • The terminal displays directions for accessing your cluster, including a link to the web console and credentials for the kubeadmin user.

  • Credential information also outputs to <installation_directory>/.openshift_install.log.

Do not delete the installation program or the files that the installation program creates. Both are required to delete the cluster.

Example output

  1. ...
  2. INFO Install complete!
  3. INFO To access the cluster as the system:admin user when using 'oc', run 'export KUBECONFIG=/home/myuser/install_dir/auth/kubeconfig'
  4. INFO Access the OpenShift web-console here: https://console-openshift-console.apps.mycluster.example.com
  5. INFO Login to the console with user: "kubeadmin", and password: "password"
  6. INFO Time elapsed: 36m22s
  • 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.

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 OKD installation.

Prerequisites

  • You deployed an OKD cluster.

  • You installed the oc CLI.

Procedure

  1. Export the kubeadmin credentials:

    1. $ export KUBECONFIG=<installation_directory>/auth/kubeconfig (1)
    1For <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:

    1. $ oc whoami

    Example output

    1. system:admin

Additional resources

Additional resources

Next steps