Add arc-2 quickstart guide (#2180)
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Bassem Dghaidi
GitHub
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# Autoscaling Runner Scale Sets mode
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**⚠️ This mode is currently only available for a limited number of organizations.**
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This new autoscaling mode brings numerous enhancements (described in the following sections) that will make your experience more reliable and secure.
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## How it works
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In addition to the increased reliability of the automatic scaling, we have worked on these improvements:
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- No longer require cert-manager as a prerequisite for installing actions-runner-controller
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- Reliable scale-up based on job demands and scale-down to zero runner pods
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- Reduce API requests to `api.github.com`, no more API rate-limiting problems
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- The GitHub Personal Access Token (PAT) or the GitHub App installation token is no longer passed to the runner pod for runner registration
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- Maximum flexibility for customizing your runner pod template
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### Demo
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https://user-images.githubusercontent.com/568794/212668313-8946ddc5-60c1-461f-a73e-27f5e8c75720.mp4
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## Setup
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### Prerequisites
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1. Create a K8s cluster, if not available.
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- If you don't have a K8s cluster, you can install a local environment using minikube. See [installing minikube](https://minikube.sigs.k8s.io/docs/start/).
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1. Install helm 3, if not available. See [installing Helm](https://helm.sh/docs/intro/install/).
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### Install actions-runner-controller
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1. Install actions-runner-controller using helm 3. For additional configuration options, see [values.yaml](https://github.com/actions/actions-runner-controller/blob/master/charts/actions-runner-controller-2/values.yaml)
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```bash
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NAMESPACE="arc-systems"
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helm install arc \
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--namespace "${NAMESPACE}" \
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--create-namespace \
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oci://ghcr.io/actions/actions-runner-controller-charts/actions-runner-controller-2 \
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--version 0.1.0
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```
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1. Generate a Personal Access Token (PAT) or create and install a GitHub App. See [Creating a personal access token](https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token) and [Creating a GitHub App](https://docs.github.com/en/developers/apps/creating-a-github-app).
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- For the list of required permissions, see [Authenticating to the GitHub API](https://github.com/actions/actions-runner-controller/blob/master/docs/authenticating-to-the-github-api.md#authenticating-to-the-github-api).
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1. You're ready to install the autoscaling runner set. For additional configuration options, see [values.yaml](https://github.com/actions/actions-runner-controller/blob/master/charts/auto-scaling-runner-set/values.yaml)
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- **Choose your installation name carefully**, you will use it as the value of `runs-on` in your workflow.
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```bash
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# Using a Personal Access Token (PAT)
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INSTALLATION_NAME="arc-runner-set"
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NAMESPACE="arc-systems"
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GITHUB_CONFIG_URL="https://github.com/<your_enterprise/org/repo>"
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GITHUB_PAT="<PAT>"
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helm install "${INSTALLATION_NAME}" \
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--namespace "${NAMESPACE}" \
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--create-namespace \
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--set githubConfigUrl="${GITHUB_CONFIG_URL}" \
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--set githubConfigSecret.github_token="${GITHUB_PAT}" \
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oci://ghcr.io/actions/actions-runner-controller-charts/auto-scaling-runner-set --version 0.1.0
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```
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```bash
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# Using a GitHub App
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INSTALLATION_NAME="arc-runner-set"
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NAMESPACE="arc-systems"
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GITHUB_CONFIG_URL="https://github.com/<your_enterprise/org/repo>"
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GITHUB_APP_ID="<GITHUB_APP_ID>"
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GITHUB_APP_INSTALLATION_ID="<GITHUB_APP_INSTALLATION_ID>"
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GITHUB_APP_PRIVATE_KEY="<GITHUB_APP_PRIVATE_KEY>"
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helm install arc-runner-set \
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--namespace "${NAMESPACE}" \
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--create-namespace \
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--set githubConfigUrl="${GITHUB_CONFIG_URL}" \
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--set githubConfigSecret.github_app_id="${GITHUB_APP_ID}" \
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--set githubConfigSecret.github_app_installation_id="${GITHUB_APP_INSTALLATION_ID}" \
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--set githubConfigSecret.github_app_private_key="${GITHUB_APP_PRIVATE_KEY}" \
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oci://ghcr.io/actions/actions-runner-controller-charts/auto-scaling-runner-set --version 0.1.0
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```
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1. Check your installation. If everything went well, you should see the following:
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```bash
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$ helm list -n "${NAMESPACE}"
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NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
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arc arc-systems 1 2023-01-18 10:03:36.610534934 +0000 UTC deployed actions-runner-controller-2-0.1.0 preview
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arc-runner-set arc-systems 1 2023-01-18 10:20:14.795285645 +0000 UTC deployed auto-scaling-runner-set-0.1.0 0.1.0
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```
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```bash
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$ kubectl get pods -n "${NAMESPACE}"
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NAME READY STATUS RESTARTS AGE
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arc-actions-runner-controller-2-8c74b6f95-gr7zr 1/1 Running 0 20m
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arc-runner-set-6cd58d58-listener 1/1 Running 0 21s
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```
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1. In a repository, create a simple test workflow as follows. The `runs-on` value should match the helm installation name you used in the previous step.
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```yaml
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name: Test workflow
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on:
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workflow_dispatch:
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jobs:
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test:
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runs-on: arc-runner-set
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steps:
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- name: Hello world
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run: echo "Hello world"
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```
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1. Run the workflow. You should see the runner pod being created and the workflow being executed.
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```bash
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$ kubectl get pods -n "${NAMESPACE}"
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NAMESPACE NAME READY STATUS RESTARTS AGE
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arc-systems arc-actions-runner-controller-2-8c74b6f95-gr7zr 1/1 Running 0 27m
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arc-systems arc-runner-set-6cd58d58-listener 1/1 Running 0 7m52s
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arc-systems arc-runner-set-rmrgw-runner-p9p5n 1/1 Running 0 21s
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```
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## Troubleshooting
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### Check the logs
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You can check the logs of the controller pod using the following command:
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```bash
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# Controller logs
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$ kubectl logs -n "${NAMESPACE}" -l app.kubernetes.io/name=actions-runner-controller-2
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# Runner set listener logs
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kubectl logs -n "${NAMESPACE}" -l runner-scale-set-listener=arc-systems-arc-runner-set
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```
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### If you installed the autoscaling runner set, but the listener pod is not created
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Verify that the secret you provided is correct and that the `githubConfigUrl` you provided is accurate.
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