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Working with the Actions Runner Controller (ARC)

This article provides step-by-step instructions for setting up ARC on a Kubernetes cluster and configuring Dependabot to run on self-hosted action runners. The article:

• Contains an overview of the ARC and Dependabot integration.
• Provides detailed installation and configuration steps using helm scripts.

What is ARC?

The Actions Runner Controller is a Kubernetes controller that manages self-hosted GitHub Actions as Kubernetes pods. It allows you to dynamically scale and orchestrate runners based on your workflows, providing better resource utilization and integration with Kubernetes environments. See Actions Runner Controller.

Dependabot on ARC

You can run Dependabot on self-hosted GitHub Actions runners managed within a Kubernetes cluster via ARC. This enables auto-scaling, workload isolation, and better resource management for Dependabot jobs, ensuring that dependency updates can run efficiently within an organization's controlled infrastructure while integrating seamlessly with GitHub Actions.

Setting up ARC for Dependabot on your Local environment

Prerequisites

• A Kubernetes cluster
  • For a managed cloud environment, you can use Azure Kubernetes Service (AKS).
  • For a local setup, you can use minikube.
• Helm
  • A package manager for Kubernetes.

Setting up ARC

1. Install ARC. For more information, see Quickstart for Actions Runner Controller.

2. Create a work directory for the ARC setup and create a shell script file (for example, helm_install_arc.sh) to install the latest ARC version.

   Bash

       mkdir ARC
       touch helm_install_arc.sh
       chmod 755 helm_install_arc.sh
   

3. Edit helm_install_arc.sh with this bash script for installing ARC.

   Text

   NAMESPACE="arc-systems"
   helm install arc \
       --namespace "${NAMESPACE}" \
       --create-namespace \
       oci://ghcr.io/actions/actions-runner-controller-charts/gha-runner-scale-set-controller
   

4. Execute the helm_install_arc.sh script file.

   ./helm_install_arc.sh
   

5. Now, you need to configure the runner scale set. For this, let's start by creating and editing a file with the following bash script.

   Bash

   touch arc-runner-set.sh
   chmod 755 arc-runner-set.sh
   

   Text

   INSTALLATION_NAME="dependabot"
   NAMESPACE="arc-runners"
   GITHUB_CONFIG_URL=REPO_URL
   GITHUB_PAT=PAT
   helm install "${INSTALLATION_NAME}" \
       --namespace "${NAMESPACE}" \
       --create-namespace \
       --set githubConfigUrl="${GITHUB_CONFIG_URL}" \
       --set githubConfigSecret.github_token="${GITHUB_PAT}" \
       --set containerMode.type="dind" \
       oci://ghcr.io/actions/actions-runner-controller-charts/gha-runner-scale-set
   

6. Execute the arc-runner-set.sh script file.

   Bash

   ./arc-runner-set.sh
   

Adding runner groups

Runner groups are used to control which organizations or repositories have access to runner scale sets. To add a runner scale set to a runner group, you must already have a runner group created.

For information about creating runner groups, see Managing access to self-hosted runners using groups.

Don't forget to add the following setting to the runner scale set configuration in the helm chart.

--set runnerGroup="<Runner group name>" \

--set runnerGroup="<Runner group name>" \

Checking your installation

1. Check your installation.

   Bash

   helm list -A
   

   Output:

   ?  ARC git:(master) ? helm list -A
       NAME           NAMESPACE   REVISION UPDATED                              STATUS   CHART                                  APP VERSION
       arc            arc-systems 1        2025-08-05 14:41:53.70893 -0500 CDT  deployed gha-runner-scale-set-controller-0.11.0 0.11.0
       arc-runner-set arc-runners 1        2025-08-05 15:08:12.58119 -0500 CDT  deployed gha-runner-scale-set-0.11.0            0.11.0
       dependabot     arc-runners 1        2025-08-05 21:53:40.080772 -0500 CDT deployed gha-runner-scale-set-0.11.0
   

2. Check the manager pod using this command.

   Bash

   kubectl get pods -n arc-systems
   

   Output:

   ?  ARC git:(master) ? kubectl get pods -n arc-systems
   
   NAME                                    READY   STATUS    RESTARTS      AGE
   arc-gha-rs-controller-57c67d4c7-zjmw2   1/1     Running   8 (36h ago)   6d9h
   arc-runner-set-754b578d-listener        1/1     Running   0             11h
   dependabot-754b578d-listener            1/1     Running   0             14h
   

Setting up Dependabot

1. On GitHub, navigate to the main page of the repository.

2. Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.

   

3. In the "Security" section of the sidebar, click Advanced Security.

4. Under "Dependabot", scroll to "Dependabot on Action Runners", and select Enable for "Dependabot on self-hosted runners".

Triggering a Dependabot run

Now that you've set up ARC, you can start a Dependabot run.

1. On GitHub, navigate to the main page of the repository.

2. Under your repository name, click the Insights tab.

3. In the left sidebar, click Dependency graph.

   

4. Under "Dependency graph", click Dependabot.

5. To the right of the name of manifest file you're interested in, click Recent update jobs.

6. If there are no recent update jobs for the manifest file, click Check for updates to re-run a Dependabot version updates'job and check for new updates to dependencies for that ecosystem.

Viewing the generated ARC runners

You can view the ARC runners that have been created for the Dependabot job.

1. On GitHub, navigate to the main page of the repository.

2. Under your repository name, click Actions.

   

3. On the left sidebar, click Runners.

4. Under "Runners", click Self-hosted runners to view the list of all the runners available in the repository. You can see the ephemeral dependabot runner that has been created.

   

   You can also view the same dependabot runner pod created in your kubernetes cluster from the terminal by executing this command.

   Text

   ?  ARC git:(master) ? kubectl get pods -n arc-runners
       NAME                            READY   STATUS    RESTARTS   AGE
       dependabot-sw8zn-runner-4mbc7   2/2     Running   0          46s
   

Additionally, you can verify:

• The logs, by checking the runner and machine name. See Viewing Dependabot job logs.

  

• The version update pull requests created by the dependabot job in the Pull requests tab of the repository.