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gha-runner-scale-set-controller

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Chainguard Container for gha-runner-scale-set-controller

Kubernetes controller for GitHub Actions self-hosted runners

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/gha-runner-scale-set-controller:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Usage

This document outlines how to test our gha-runner-scale-set-controller image. You can set up ARC on Kubernetes using Helm, then create and run a workflow that uses runner scale sets.

For more information about runner scale sets, you should refer to the official documentation, Quickstart for Actions Runner Controller.

Prerequisites

You can find a detailed list of prerequisites in the official documentation, (here)[https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners-with-actions-runner-controller/quickstart-for-actions-runner-controller#prerequisites).

But for the sake of simplicity, all you need is:

  • A Kubernetes cluster
  • Helm 3
  • A GitHub repository with a workflow that uses runner scale sets

that's all.

Testing

To test the gha-runner-scale-set-controller image, you can follow these steps:

  1. Install the Actions Runner Controller on your Kubernetes cluster using Helm. You can find the installation instructions here.
NAMESPACE="arc-systems"
helm install arc \
    --namespace "${NAMESPACE}" \
    --create-namespace \
    oci://ghcr.io/actions/actions-runner-controller-charts/gha-runner-scale-set-controller \
    --set image.repository=cgr.dev/chainguard/gha-runner-scale-set-controller \
    --set image.tag=latest
  1. To configure the runner scale set, you can follow the official documentation here.

For that, you will need two things:

  • A GitHub repository with a workflow that uses runner scale sets
  • A runner registration token which we refer GITHUB_PAT
INSTALLATION_NAME="arc-runner-set"
NAMESPACE="arc-runners"
GITHUB_CONFIG_URL="https://github.com/<org/repo/enterprise>" # make sure to replace this with your GitHub repository URL or GitHub Enterprise URL
GITHUB_PAT="<PAT>" # make sure to replace this with your GitHub PAT

helm install "${INSTALLATION_NAME}" \
    --namespace "${NAMESPACE}" \
    --create-namespace \
    --set githubConfigUrl="${GITHUB_CONFIG_URL}" \
    --set githubConfigSecret.github_token="${GITHUB_PAT}" \
    oci://ghcr.io/actions/actions-runner-controller-charts/gha-runner-scale-set

Once you did that you can create and run a workflow that uses runner scale sets like the following:

name: Actions Runner Controller Demo
on:
  workflow_dispatch:

jobs:
  Explore-GitHub-Actions:
    # You need to use the INSTALLATION_NAME from the previous step
    runs-on: arc-runner-set
    steps:
    - run: echo "🎉 This job uses runner scale set runners!"

That's it! You have successfully tested the gha-runner-scale-set-controller image.

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Licenses

Chainguard container images contain software packages that are direct or transitive dependencies. The following licenses were found in the "latest" tag of this image:

  • Apache-2.0

  • LGPL-2.1-or-later

  • MIT

  • MPL-2.0

For a complete list of licenses, please refer to this Image's SBOM.

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