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This component creates a Helm release for actions-runner-controller on an EKS cluster.

Usage

Stack Level: Regional

Once the catalog file is created, the file can be imported as follows.

import:
  - catalog/eks/actions-runner-controller
  ...

The default catalog values e.g. stacks/catalog/eks/actions-runner-controller.yaml

components:
  terraform:
    eks/actions-runner-controller:
      vars:
        enabled: true
        name: "actions-runner" # avoids hitting name length limit on IAM role
        chart: "actions-runner-controller"
        chart_repository: "https://actions-runner-controller.github.io/actions-runner-controller"
        chart_version: "0.23.7"
        kubernetes_namespace: "actions-runner-system"
        create_namespace: true
        kubeconfig_exec_auth_api_version: "client.authentication.k8s.io/v1beta1"
        # helm_manifest_experiment_enabled feature causes inconsistent final plans with charts that have CRDs
        # see https://github.com/hashicorp/terraform-provider-helm/issues/711#issuecomment-836192991
        helm_manifest_experiment_enabled: false

        ssm_github_secret_path: "/github_runners/controller_github_app_secret"
        github_app_id: "REPLACE_ME_GH_APP_ID"
        github_app_installation_id: "REPLACE_ME_GH_INSTALLATION_ID"

        # use to enable docker config json secret, which can login to dockerhub for your GHA Runners
        docker_config_json_enabled: true
        # The content of this param should look like:
        # {
        #  "auths": {
        #    "https://index.docker.io/v1/": {
        #      "username": "your_username",
        #      "password": "your_password
        #      "email": "your_email",
        #      "auth": "$(echo "your_username:your_password" | base64)"
        #    }
        #  }
        # } | base64
        ssm_docker_config_json_path: "/github_runners/docker/config-json"

        # ssm_github_webhook_secret_token_path: "/github_runners/github_webhook_secret_token"
        # The webhook based autoscaler is much more efficient than the polling based autoscaler
        webhook:
          enabled: true
          hostname_template: "gha-webhook.%[3]v.%[2]v.%[1]v.acme.com"

        eks_component_name: "eks/cluster"
        resources:
          limits:
            cpu: 500m
            memory: 256Mi
          requests:
            cpu: 250m
            memory: 128Mi
        runners:
          infra-runner:
            node_selector:
              kubernetes.io/os: "linux"
              kubernetes.io/arch: "amd64"
            type: "repository" # can be either 'organization' or 'repository'
            dind_enabled: true # If `true`, a Docker daemon will be started in the runner Pod.
            # To run Docker in Docker (dind), change image to summerwind/actions-runner-dind
            # If not running Docker, change image to summerwind/actions-runner use a smaller image
            image: summerwind/actions-runner-dind
            # `scope` is org name for Organization runners, repo name for Repository runners
            scope: "org/infra"
            min_replicas: 0 # Default, overridden by scheduled_overrides below
            max_replicas: 20
            # Scheduled overrides. See https://github.com/actions/actions-runner-controller/blob/master/docs/automatically-scaling-runners.md#scheduled-overrides
            # Order is important. The earlier entry is prioritized higher than later entries. So you usually define
            # one-time overrides at the top of your list, then yearly, monthly, weekly, and lastly daily overrides.
            scheduled_overrides:
              # Override the daily override on the weekends
              - start_time: "2024-07-06T00:00:00-08:00" # Start of Saturday morning Pacific Standard Time
                end_time: "2024-07-07T23:59:59-07:00" # End of Sunday night Pacific Daylight Time
                min_replicas: 0
                recurrence_rule:
                  frequency: "Weekly"
              # Keep a warm pool of runners during normal working hours
              - start_time: "2024-07-01T09:00:00-08:00" # 9am Pacific Standard Time (8am PDT), start of workday
                end_time: "2024-07-01T17:00:00-07:00" # 5pm Pacific Daylight Time (6pm PST), end of workday
                min_replicas: 2
                recurrence_rule:
                  frequency: "Daily"
            scale_down_delay_seconds: 100
            resources:
              limits:
                cpu: 200m
                memory: 512Mi
              requests:
                cpu: 100m
                memory: 128Mi
            webhook_driven_scaling_enabled: true
            # max_duration is the duration after which a job will be considered completed,
            # (and the runner killed) even if the webhook has not received a "job completed" event.
            # This is to ensure that if an event is missed, it does not leave the runner running forever.
            # Set it long enough to cover the longest job you expect to run and then some.
            # See https://github.com/actions/actions-runner-controller/blob/9afd93065fa8b1f87296f0dcdf0c2753a0548cb7/docs/automatically-scaling-runners.md?plain=1#L264-L268
            max_duration: "90m"
            # Pull-driven scaling is obsolete and should not be used.
            pull_driven_scaling_enabled: false
            # Labels are not case-sensitive to GitHub, but *are* case-sensitive
            # to the webhook based autoscaler, which requires exact matches
            # between the `runs-on:` label in the workflow and the runner labels.
            labels:
              - "Linux"
              - "linux"
              - "Ubuntu"
              - "ubuntu"
              - "X64"
              - "x64"
              - "x86_64"
              - "amd64"
              - "AMD64"
              - "core-auto"
              - "common"
          # Uncomment this additional runner if you want to run a second
          # runner pool for `arm64` architecture
          #infra-runner-arm64:
          #  node_selector:
          #    kubernetes.io/os: "linux"
          #    kubernetes.io/arch: "arm64"
          #  # Add the corresponding taint to the Kubernetes nodes running `arm64` architecture
          #  # to prevent Kubernetes pods without node selectors from being scheduled on them.
          #  tolerations:
          #  - key: "kubernetes.io/arch"
          #    operator: "Equal"
          #    value: "arm64"
          #    effect: "NoSchedule"
          #  type: "repository" # can be either 'organization' or 'repository'
          #  dind_enabled: false # If `true`, a Docker sidecar container will be deployed
          #  # To run Docker in Docker (dind), change image to summerwind/actions-runner-dind
          #  # If not running Docker, change image to summerwind/actions-runner use a smaller image
          #  image: summerwind/actions-runner-dind
          #  # `scope` is org name for Organization runners, repo name for Repository runners
          #  scope: "org/infra"
          #  group: "ArmRunners"
          #  # Tell Karpenter not to evict this pod while it is running a job.
          #  # If we do not set this, Karpenter will feel free to terminate the runner while it is running a job,
          #  # as part of its consolidation efforts, even when using "on demand" instances.
          #  running_pod_annotations:
          #    karpenter.sh/do-not-disrupt: "true"
          #  min_replicas: 0 # Set to so that no ARM instance is running idle, set to 1 for faster startups
          #  max_replicas: 20
          #  scale_down_delay_seconds: 100
          #  resources:
          #    limits:
          #      cpu: 200m
          #      memory: 512Mi
          #    requests:
          #      cpu: 100m
          #      memory: 128Mi
          #  webhook_driven_scaling_enabled: true
          #  max_duration: "90m"
          #  pull_driven_scaling_enabled: false
          #  # Labels are not case-sensitive to GitHub, but *are* case-sensitive
          #  # to the webhook based autoscaler, which requires exact matches
          #  # between the `runs-on:` label in the workflow and the runner labels.
          #  # Leave "common" off the list so that "common" jobs are always
          #  # scheduled on the amd64 runners. This is because the webhook
          #  # based autoscaler will not scale a runner pool if the
          #  # `runs-on:` labels in the workflow match more than one pool.
          #  labels:
          #    - "Linux"
          #    - "linux"
          #    - "Ubuntu"
          #    - "ubuntu"
          #    - "amd64"
          #    - "AMD64"
          #    - "core-auto"

Generating Required Secrets

AWS SSM is used to store and retrieve secrets.

Decide on the SSM path for the GitHub secret (PAT or Application private key) and GitHub webhook secret.

Since the secret is automatically scoped by AWS to the account and region where the secret is stored, we recommend the secret be stored at /github_runners/controller_github_app_secret unless you plan on running multiple instances of the controller. If you plan on running multiple instances of the controller, and want to give them different access (otherwise they could share the same secret), then you can add a path component to the SSM path. For example /github_runners/cicd/controller_github_app_secret.

ssm_github_secret_path: "/github_runners/controller_github_app_secret"

The preferred way to authenticate is by creating and installing a GitHub App. This is the recommended approach as it allows for more much more restricted access than using a personal access token, at least until fine-grained personal access token permissions are generally available. Follow the instructions here to create and install the GitHub App.

At the creation stage, you will be asked to generate a private key. This is the private key that will be used to authenticate the Action Runner Controller. Download the file and store the contents in SSM using the following command, adjusting the profile and file name. The profile should be the admin role in the account to which you are deploying the runner controller. The file name should be the name of the private key file you downloaded.

AWS_PROFILE=acme-mgmt-use2-auto-admin chamber write github_runners controller_github_app_secret -- "$(cat APP_NAME.DATE.private-key.pem)"

You can verify the file was correctly written to SSM by matching the private key fingerprint reported by GitHub with:

AWS_PROFILE=acme-mgmt-use2-auto-admin chamber read -q github_runners controller_github_app_secret | openssl rsa -in - -pubout -outform DER | openssl sha256 -binary | openssl base64

At this stage, record the Application ID and the private key fingerprint in your secrets manager (e.g. 1Password). You will need the Application ID to configure the runner controller, and want the fingerprint to verify the private key.

Proceed to install the GitHub App in the organization or repository you want to use the runner controller for, and record the Installation ID (the final numeric part of the URL, as explained in the instructions linked above) in your secrets manager. You will need the Installation ID to configure the runner controller.

In your stack configuration, set the following variables, making sure to quote the values so they are treated as strings, not numbers.

github_app_id: "12345"
github_app_installation_id: "12345"

OR (obsolete)

• A PAT with the scope outlined in this document. Save this to the value specified by ssm_github_token_path using the following command, adjusting the AWS_PROFILE to refer to the admin role in the account to which you are deploying the runner controller:

AWS_PROFILE=acme-mgmt-use2-auto-admin chamber write github_runners controller_github_app_secret -- "<PAT>"

2. If using the Webhook Driven autoscaling (recommended), generate a random string to use as the Secret when creating the webhook in GitHub.

Generate the string using 1Password (no special characters, length 45) or by running

dd if=/dev/random bs=1 count=33  2>/dev/null | base64

Store this key in AWS SSM under the same path specified by ssm_github_webhook_secret_token_path

ssm_github_webhook_secret_token_path: "/github_runners/github_webhook_secret"

Dockerhub Authentication

Authenticating with Dockerhub is optional but when enabled can ensure stability by increasing the number of pulls allowed from your runners.

To get started set docker_config_json_enabled to true and ssm_docker_config_json_path to the SSM path where the credentials are stored, for example github_runners/docker.

To create the credentials file, fill out a JSON file locally with the following content:

{
  "auths": {
    "https://index.docker.io/v1/": {
      "username": "your_username",
      "password": "your_password",
      "email": "your_email",
      "auth": "$(echo "your_username: your_password" | base64)"
    }
  }
}

Then write the file to SSM with the following Atmos Workflow:

save/docker-config-json:
  description: Prompt for uploading Docker Config JSON to the AWS SSM Parameter Store
  steps:
    - type: shell
      command: |-
        echo "Please enter the Docker Config JSON file path"
        echo "See https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry for information on how to create the file"
        read -p "Docker Config JSON file path: " -r DOCKER_CONFIG_JSON_FILE_PATH
        if [ -z "DOCKER_CONFIG_JSON_FILE_PATH" ]
        then
            echo 'Inputs cannot be blank please try again!'
            exit 0
        fi

        DOCKER_CONFIG_JSON=$(<$DOCKER_CONFIG_JSON_FILE_PATH);
        ENCODED_DOCKER_CONFIG_JSON=$(echo "$DOCKER_CONFIG_JSON" | base64 -w 0 );

        echo $DOCKER_CONFIG_JSON
        echo $ENCODED_DOCKER_CONFIG_JSON

        AWS_PROFILE=acme-core-gbl-auto-admin

        set -e

        chamber write github_runners/docker config-json -- "$ENCODED_DOCKER_CONFIG_JSON"

        echo 'Saved Docker Config JSON to the AWS SSM Parameter Store'

Don't forget to update the AWS Profile in the script.

Using Runner Groups

GitHub supports grouping runners into distinct Runner Groups, which allow you to have different access controls for different runners. Read the linked documentation about creating and configuring Runner Groups, which you must do through the GitHub Web UI. If you choose to create Runner Groups, you can assign one or more Runner pools (from the runners map) to groups (only one group per runner pool) by including group: <Runner Group Name> in the runner configuration. We recommend including it immediately after scope.

Using Webhook Driven Autoscaling (recommended)

We recommend using Webhook Driven Autoscaling until GitHub's own autoscaling solution is as capable as the Summerwind solution this component deploys. See this discussion for some perspective on why the Summerwind solution is currently (summer 2024) considered superior.

To use the Webhook Driven Autoscaling, in addition to setting webhook_driven_scaling_enabled to true, you must also install the GitHub organization-level webhook after deploying the component (specifically, the webhook server). The URL for the webhook is determined by the webhook.hostname_template and where it is deployed. Recommended URL is https://gha-webhook.[environment].[stage].[tenant].[service-discovery-domain].

As a GitHub organization admin, go to https://github.com/organizations/[organization]/settings/hooks, and then:

• Click"Add webhook" and create a new webhook with the following settings:
  • Payload URL: copy from Terraform output webhook_payload_url
  • Content type: application/json
  • Secret: whatever you configured in the sops secret above
  • Which events would you like to trigger this webhook:
    • Select "Let me select individual events"
    • Uncheck everything ("Pushes" is likely the only thing already selected)
    • Check "Workflow jobs"
  • Ensure that "Active" is checked (should be checked by default)
  • Click "Add webhook" at the bottom of the settings page

After the webhook is created, select "edit" for the webhook and go to the "Recent Deliveries" tab and verify that there is a delivery (of a "ping" event) with a green check mark. If not, verify all the settings and consult the logs of the actions-runner-controller-github-webhook-server pod.

Configuring Webhook Driven Autoscaling

The HorizontalRunnerAutoscaler scaleUpTriggers.duration (see [Webhook Driven Scaling documentation](https://github. com/actions/actions-runner-controller/blob/master/docs/automatically-scaling-runners.md#webhook-driven-scaling)) is controlled by the max_duration setting for each Runner. The purpose of this timeout is to ensure, in case a job cancellation or termination event gets missed, that the resulting idle runner eventually gets terminated.

How the Autoscaler Determines the Desired Runner Pool Size

When a job is queued, a capacityReservation is created for it. The HRA (Horizontal Runner Autoscaler) sums up all the capacity reservations to calculate the desired size of the runner pool, subject to the limits of minReplicas and maxReplicas. The idea is that a capacityReservation is deleted when a job is completed or canceled, and the pool size will be equal to jobsStarted - jobsFinished. However, it can happen that a job will finish without the HRA being successfully notified about it, so as a safety measure, the capacityReservation will expire after a configurable amount of time, at which point it will be deleted without regard to the job being finished. This ensures that eventually an idle runner pool will scale down to minReplicas.

If it happens that the capacity reservation expires before the job is finished, the Horizontal Runner Autoscaler (HRA) will scale down the pool by 2 instead of 1: once because the capacity reservation expired, and once because the job finished. This will also cause starvation of waiting jobs, because the next in line will have its timeout timer started but will not actually start running because no runner is available. And if minReplicas is set to zero, the pool will scale down to zero before finishing all the jobs, leaving some waiting indefinitely. This is why it is important to set the max_duration to a time long enough to cover the full time a job may have to wait between the time it is queued and the time it finishes, assuming that the HRA scales up the pool by 1 and runs the job on the new runner.

[!TIP]

If there are more jobs queued than there are runners allowed by maxReplicas, the timeout timer does not start on the capacity reservation until enough reservations ahead of it are removed for it to be considered as representing and active job. Although there are some edge cases regarding max_duration that seem not to be covered properly (see actions-runner-controller issue #2466), they only merit adding a few extra minutes to the timeout.

Recommended max_duration Duration

Consequences of Too Short of a max_duration Duration

If you set max_duration to too short a duration, the Horizontal Runner Autoscaler will cancel capacity reservations for jobs that have not yet finished, and the pool will become too small. This will be most serious if you have set minReplicas = 0 because in this case, jobs will be left in the queue indefinitely. With a higher value of minReplicas, the pool will eventually make it through all the queued jobs, but not as quickly as intended due to the incorrectly reduced capacity.

Consequences of Too Long of a max_duration Duration

If the Horizontal Runner Autoscaler misses a scale-down event (which can happen because events do not have delivery guarantees), a runner may be left running idly for as long as the max_duration duration. The only problem with this is the added expense of leaving the idle runner running.

Recommendation

As a result, we recommend setting max_duration to a period long enough to cover:

• The time it takes for the HRA to scale up the pool and make a new runner available
• The time it takes for the runner to pick up the job from GitHub
• The time it takes for the job to start running on the new runner
• The maximum time a job might take

Because the consequences of expiring a capacity reservation before the job is finished can be severe, we recommend setting max_duration to a period at least 30 minutes longer than you expect the longest job to take. Remember, when everything works properly, the HRA will scale down the pool as jobs finish, so there is little cost to setting a long duration, and the cost looks even smaller by comparison to the cost of having too short a duration.

For lightly used runner pools expecting only short jobs, you can set max_duration to "30m". As a rule of thumb, we recommend setting maxReplicas high enough that jobs never wait on the queue more than an hour.

Interaction with Karpenter or other EKS autoscaling solutions

Kubernetes cluster autoscaling solutions generally expect that a Pod runs a service that can be terminated on one Node and restarted on another with only a short duration needed to finish processing any in-flight requests. When the cluster is resized, the cluster autoscaler will do just that. However, GitHub Action Runner Jobs do not fit this model. If a Pod is terminated in the middle of a job, the job is lost. The likelihood of this happening is increased by the fact that the Action Runner Controller Autoscaler is expanding and contracting the size of the Runner Pool on a regular basis, causing the cluster autoscaler to more frequently want to scale up or scale down the EKS cluster, and, consequently, to move Pods around.

To handle these kinds of situations, Karpenter respects an annotation on the Pod:

spec:
  template:
    metadata:
      annotations:
        karpenter.sh/do-not-disrupt: "true"

When you set this annotation on the Pod, Karpenter will not evict it. This means that the Pod will stay on the Node it is on, and the Node it is on will not be considered for eviction. This is good because it means that the Pod will not be terminated in the middle of a job. However, it also means that the Node the Pod is on will not be considered for termination, which means that the Node will not be removed from the cluster, which means that the cluster will not shrink in size when you would like it to.

Since the Runner Pods terminate at the end of the job, this is not a problem for the Pods actually running jobs. However, if you have set minReplicas > 0, then you have some Pods that are just idling, waiting for jobs to be assigned to them. These Pods are exactly the kind of Pods you want terminated and moved when the cluster is underutilized. Therefore, when you set minReplicas > 0, you should NOT set karpenter.sh/do-not-evict: "true" on the Pod via the pod_annotations attribute of the runners input. (But wait, there is good news!)

We have requested a feature that will allow you to set karpenter.sh/do-not-disrupt: "true" and minReplicas > 0 at the same time by only annotating Pods running jobs. Meanwhile, we have implemented this for you using a job startup hook. This hook will set annotations on the Pod when the job starts. When the job finishes, the Pod will be deleted by the controller, so the annotations will not need to be removed. Configure annotations that apply only to Pods running jobs in the running_pod_annotations attribute of the runners input.

Updating CRDs

When updating the chart or application version of actions-runner-controller, it is possible you will need to install new CRDs. Such a requirement should be indicated in the actions-runner-controller release notes and may require some adjustment to our custom chart or configuration.

This component uses helm to manage the deployment, and helm will not auto-update CRDs. If new CRDs are needed, install them manually via a command like

kubectl create -f https://raw.githubusercontent.com/actions-runner-controller/actions-runner-controller/master/charts/actions-runner-controller/crds/actions.summerwind.dev_horizontalrunnerautoscalers.yaml

Useful Reference

Consult actions-runner-controller documentation for further details.

Requirements

Providers

Modules

Resources

Inputs

Outputs

References

• cloudposse/terraform-aws-components - Cloud Posse's upstream component
• alb-controller - Helm Chart
• alb-controller - AWS Load Balancer Controller
• actions-runner-controller Webhook Driven Scaling
• actions-runner-controller Chart Values

[!NOTE] This project is part of Cloud Posse's comprehensive "SweetOps" approach towards DevOps.

<details><summary><strong>Learn More</strong></summary>

It's 100% Open Source and licensed under the APACHE2.

</details>

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