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get-gke-credentials

This action configures authentication to a GKE cluster via a kubeconfig file that can be used with kubectl or other methods of interacting with the cluster.

Authentication is performed by generating a short-lived token (default behaviour) or via the GCP auth plugin present in kubectl which uses the service account keyfile path in GOOGLE_APPLICATION_CREDENTIALS.

This is not an officially supported Google product, and it is not covered by a Google Cloud support contract. To report bugs or request features in a Google Cloud product, please contact Google Cloud support.

Prerequisites

This action requires:

Google Cloud credentials that are authorized to view a GKE cluster. See the Authorization section below for more information. You also need to create a GKE cluster.
This action runs using Node 20. If you are using self-hosted GitHub Actions runners, you must use a runner version that supports this version or newer.
If you plan to create binaries, containers, pull requests, or other releases, add the following to your .gitignore to prevent accidentially committing the KUBECONFIG to your release artifact:
```
# Ignore generated kubeconfig from google-github-actions/get-gke-credentials
gha-kubeconfig-*
```

Usage

jobs:
  job_id:
    permissions:
      contents: 'read'
      id-token: 'write'

    steps:
    - id: 'auth'
      uses: 'google-github-actions/auth@v2'
      with:
        workload_identity_provider: 'projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider'
        service_account: 'my-service-account@my-project.iam.gserviceaccount.com'

    - id: 'get-credentials'
      uses: 'google-github-actions/get-gke-credentials@v2'
      with:
        cluster_name: 'my-cluster'
        location: 'us-central1-a'

    # The KUBECONFIG env var is automatically exported and picked up by kubectl.
    - id: 'get-pods'
      run: 'kubectl get pods'

Inputs

cluster_name - (Required) Name of the cluster for which to get credentials. If specified as a full resource name (e.g. "projects/p/locations/l/clusters/c"), then then "project_id" and "location" inputs are optional. If only specified as the name (e.g. "my-cluster"), then the "project_id" and "location" inputs may be required.
location - (Optional) Location (e.g. region or zone) in which the cluster resides. This value is required unless you specify "cluster_name" as a full resource name.
project_id - (Optional) Project ID where the cluster is deployed. If provided, this will override the project configured by previous steps or environment variables. If not provided, the project will be inferred, best-effort.
use_auth_provider - (Optional) If true, use the Google Cloud auth plugin in kubectl instead of a short-lived access token. The default value is false.
use_internal_ip - (Optional) If true, use the internal IP address for the cluster endpoint. This is mostly used with private GKE clusters. The default value is false.
use_connect_gateway - (Optional) If true, uses the Connect Gateway endpoint to connect to the cluster. The default value is false.
fleet_membership_name - (Optional) Fleet membership name of form "projects/PROJECT_ID/locations/LOCATION/memberships/MEMBERSHIP_NAME" to use for generating the Connect Gateway endpoint. This only applies if "use_connect_gateway" is true. Defaults to auto discovery if empty.
quota_project_id - (Optional) Project ID from which to pull quota. The caller must have serviceusage.services.use permission on the project. If unspecified, this defaults to the project of the authenticated principle. This is an advanced setting, most users should leave this blank.

Outputs

kubeconfig_path - Path on the local filesystem where the generated KUBECONFIG file resides.
Exports env var KUBECONFIG which is set to the generated kubeconfig file path.

Authorization

There are a few ways to authenticate this action. A service account will be needed with at least the following roles:

Kubernetes Engine Cluster Viewer (roles/container.clusterViewer)

If you are using the Connect Gateway, you must also have:

GKE Hub Viewer (roles/gkehub.viewer)

Via google-github-actions/auth

Use google-github-actions/auth to authenticate the action. You can use Workload Identity Federation or traditional Service Account Key JSON authentication. by specifying the credentials input. This Action supports both the recommended Workload Identity Federation based authentication and the traditional Service Account Key JSON based auth.

See usage for more details.

Authenticating via Workload Identity Federation

jobs:
  job_id:
    permissions:
      contents: 'read'
      id-token: 'write'

    steps:
    - id: 'auth'
      uses: 'google-github-actions/auth@v2'
      with:
        workload_identity_provider: 'projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider'
        service_account: 'my-service-account@my-project.iam.gserviceaccount.com'

    - id: 'get-credentials'
      uses: 'google-github-actions/get-gke-credentials@v2'
      with:
        cluster_name: 'my-cluster'
        location: 'us-central1-a'

Authenticating via Service Account Key JSON

jobs:
  job_id:
    steps:
    - id: 'auth'
      uses: 'google-github-actions/auth@v2'
      with:
        credentials_json: '${{ secrets.gcp_credentials }}'

    - id: 'get-credentials'
      uses: 'google-github-actions/get-gke-credentials@v2'
      with:
        cluster_name: 'my-cluster'
        location: 'us-central1-a'

Via Application Default Credentials

If you are hosting your own runners, and those runners are on Google Cloud, you can leverage the Application Default Credentials of the instance. This will authenticate requests as the service account attached to the instance. This only works using a custom runner hosted on GCP.

jobs:
  job_id:
    steps:
    - id: 'get-credentials'
      uses: 'google-github-actions/get-gke-credentials@v2'
      with:
        cluster_name: 'my-cluster'
        location: 'us-central1-a'

The action will automatically detect and use the Application Default Credentials.

With Connect gateway

You can utilize the Connect gateway feature of Fleets with this action to connect to clusters without direct network connectivity. This can be useful for connecting to private clusters from GitHub hosted runners.

jobs:
  job_id:
    steps:
    - id: 'get-credentials'
      uses: 'google-github-actions/get-gke-credentials@v2'
      with:
        cluster_name: 'my-private-cluster'
        location: 'us-central1-a'
        use_connect_gateway: 'true'

Follow the Connect gateway documentation for initial setup. Note: The Connect Agent service account must have the correct impersonation policy on the service account used to authenticate this action.

License

google-github-actions/get-gke-credentials

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