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Terraform module for scalable self hosted GitHub action runners

awesome-runnersTerraform registry Terraform checks Lambda Webhook Lambda Runners Lambda Syncer

This Terraform module creates the required infrastructure needed to host GitHub Actions self hosted, auto scaling runners on AWS spot instances. It provides the required logic to handle the life cycle for scaling up and down using a set of AWS Lambda functions. Runners are scaled down to zero to avoid costs when no workflows are active.

Motivation

GitHub Actions self hosted runners provide a flexible option to run CI workloads on infrastructure of your choice. Currently there is no option provided to automate the creation and scaling of action runners. This module takes care of creating the AWS infrastructure to host action runners on spot instances. It provides lambda modules to orchestrate the life cycle of the action runners.

Lambda is chosen as runtime for two major reasons. First it allows to create small components with minimal access to AWS and GitHub. Secondly it provides a scalable setup with minimal costs that works on repo level and scales to organization level. The lambdas will create Linux based EC2 instances with Docker to serve CI workloads that can run on Linux and/or Docker. The main goal is to support Docker based workloads.

A logical question would be why not Kubernetes? In the current approach we stay close to the way the GitHub action runners are available today. The approach is to install the runner on a host where the required software is available. With this setup we stay quite close to the current GitHub approach. Another logical choice would be AWS Auto Scaling groups. This choice would typically require much more permissions on instance level to GitHub. And besides that, scaling up and down is not trivial.

Overview

The moment a GitHub action workflow requiring a self-hosted runner is triggered, GitHub will try to find a runner which can execute the workload. This module reacts to GitHub's check_run event or workflow_job event for the triggered workflow and creates a new runner if necessary.

For receiving the check_run or workflow_job event by the webhook (lambda) a webhook in GitHub needs to be created. The workflow_job is the preferred option and the check_run option will be maintained for backward compatibility. Advantage of the workflow_job event is that the runner checks if the received event can run on the configured runners by matching the labels, which avoid instances are scaled up and never used. The following options are available:

  • workflow_job: (preferred option) create a webhook on enterprise, org or app level.
  • check_run: create a webhook on enterprise, org, repo or app level. When using the app option, the app needs to be installed to repo's are using the self-hosted runners.
  • a Webhook needs to be created. The webhook hook can be defined on enterprise, org, repo, or app level.

In AWS a API gateway endpoint is created that is able to receive the GitHub webhook events via HTTP post. The gateway triggers the webhook lambda which will verify the signature of the event. This check guarantees the event is sent by the GitHub App. The lambda only handles workflow_job or check_run events with status queued and matching the runner labels (only for workflow_job). The accepted events are posted on a SQS queue. Messages on this queue will be delayed for a configurable amount of seconds (default 30 seconds) to give the available runners time to pick up this build.

The "scale up runner" lambda is listening to the SQS queue and picks up events. The lambda runs various checks to decide whether a new EC2 spot instance needs to be created. For example, the instance is not created if the build is already started by an existing runner, or the maximum number of runners is reached.

The Lambda first requests a registration token from GitHub which is needed later by the runner to register itself. This avoids that the EC2 instance, which later in the process will install the agent, needs administration permissions to register the runner. Next the EC2 spot instance is created via the launch template. The launch template defines the specifications of the required instance and contains a user_data script. This script will install the required software and configure it. The registration token for the action runner is stored in the parameter store (SSM) from which the user data script will fetch it and delete it once it has been retrieved. Once the user data script is finished the action runner should be online and the workflow will start in seconds.

Scaling down the runners is at the moment brute-forced, every configurable amount of minutes a lambda will check every runner (instance) if it is busy. In case the runner is not busy it will be removed from GitHub and the instance terminated in AWS. At the moment there seems no other option to scale down more smoothly.

Downloading the GitHub Action Runner distribution can be occasionally slow (more than 10 minutes). Therefore a lambda is introduced that synchronizes the action runner binary from GitHub to an S3 bucket. The EC2 instance will fetch the distribution from the S3 bucket instead of the internet.

Secrets and private keys are stored in SSM Parameter Store. These values are encrypted using the default KMS key for SSM or passing in a custom KMS key.

Architecture

Permission are managed on several places. Below the most important ones. For details check the Terraform sources.

  • The GitHub App requires access to actions and publish workflow_job events to the AWS webhook (API gateway).
  • The scale up lambda should have access to EC2 for creating and tagging instances.
  • The scale down lambda should have access to EC2 to terminate instances.

Besides these permissions, the lambdas also need permission to CloudWatch (for logging and scheduling), SSM and S3. For more details about the required permissions see the documentation of the IAM module which uses permission boundaries.

ARM64 support via Graviton/Graviton2 instance-types

When using the default example or top-level module, specifying an instance_type that matches a Graviton/Graviton 2 (ARM64) architecture (e.g. a1 or any 6th-gen g or gd type), the sub-modules will be automatically configured to provision with ARM64 AMIs and leverage GitHub's ARM64 action runner. See below for more details.

Usages

Examples are provided in the example directory. Please ensure you have installed the following tools.

  • Terraform, or tfenv.
  • Bash shell or compatible
  • Docker (optional, to build lambdas without node).
  • AWS cli (optional)
  • Node and yarn (for lambda development).

The module supports two main scenarios for creating runners. On repository level a runner will be dedicated to only one repository, no other repository can use the runner. On organization level you can use the runner(s) for all the repositories within the organization. See GitHub instructions for more information. Before starting the deployment you have to choose one option.

GitHub workflows fail immediately if there is no action runner available for your builds. Since this module supports scaling down to zero, builds will fail in case there is no active runner available. We recommend to create an offline runner with matching labels to the configuration. Create this runner manually by following the GitHub instructions for adding a new runner on your local machine. If you stop the process after the step of running the config.sh script the runner will remain offline. This offline runner ensures that builds will not fail immediately and stay queued until there is an EC2 runner to pick it up.

Another convenient way of deploying this temporary required runner is using following approach. This automates all the manual labor.

Temporary runner using Docker 
docker run -it --name my-runner \
    -e RUNNER_LABELS=selfhosted,Linux,Ubuntu -e RUNNER_NAME=my-repo-docker-runner \
    -e GITHUB_ACCESS_TOKEN=$GH_PERSONAL_ACCESS_TOKEN \
    -e RUNNER_REPOSITORY_URL=https://github.com/my-org/my-repo \
    -v /var/run/docker.sock:/var/run/docker.sock \
    tcardonne/github-runner:ubuntu-20.04

You should stop and remove the container once the runner is registered as the builds would otherwise go to your local Docker container.

The setup consists of running Terraform to create all AWS resources and manually configuring the GitHub App. The Terraform module requires configuration from the GitHub App and the GitHub app requires output from Terraform. Therefore you first create the GitHub App and configure the basics, then run Terraform, and afterwards finalize the configuration of the GitHub App.

Setup GitHub App (part 1)

Go to GitHub and create a new app. Beware you can create apps your organization or for a user. For now we support only organization level apps.

  1. Create app in Github
  2. Choose a name
  3. Choose a website (mandatory, not required for the module).
  4. Disable the webhook for now (we will configure this later or create an alternative webhook).
  5. Permissions for all runners:
    • Repository:
      • Actions: Read-only (check for queued jobs)
      • Checks: Read-only (receive events for new builds)
      • Metadata: Read-only (default/required)
  6. Permissions for repo level runners only:
    • Repository:
      • Administration: Read & write (to register runner)
  7. Permissions for organization level runners only:
    • Organization
      • Self-hosted runners: Read & write (to register runner)
  8. Save the new app.
  9. On the General page, make a note of the "App ID" and "Client ID" parameters.
  10. Generate a new private key and save the app.private-key.pem file.

Setup terraform module

Download lambdas

To apply the terraform module, the compiled lambdas (.zip files) need to be available either locally or in an S3 bucket. They can be either downloaded from the GitHub release page or build locally.

To read the files from S3, set the lambda_s3_bucket variable and the specific object key for each lambda.

The lambdas can be downloaded manually from the release page or using the download-lambda terraform module (requires curl to be installed on your machine). In the download-lambda directory, run terraform init && terraform apply. The lambdas will be saved to the same directory.

For local development you can build all the lambdas at once using .ci/build.sh or individually using yarn dist.

Service-linked role

To create spot instances the AWSServiceRoleForEC2Spot role needs to be added to your account. You can do that manually by following the AWS docs. To use terraform for creating the role, either add the following resource or let the module manage the the service linked role by setting create_service_linked_role_spot to true. Be aware this is an account global role, so maybe you don't want to manage it via a specific deployment.

resource "aws_iam_service_linked_role" "spot" {
  aws_service_name = "spot.amazonaws.com"
}

Terraform module

Next create a second terraform workspace and initiate the module, or adapt one of the examples.

Note that github_app.key_base64 needs to be a base64-encoded string of the .pem file i.e. the output of base64 app.private-key.pem. The decoded string can either be a multiline value or a single line value with new lines represented with literal \n characters.

module "github-runner" {
  source  = "philips-labs/github-runner/aws"
  version = "REPLACE_WITH_VERSION"

  aws_region = "eu-west-1"
  vpc_id     = "vpc-123"
  subnet_ids = ["subnet-123", "subnet-456"]

  environment = "gh-ci"

  github_app = {
    key_base64     = "base64string"
    id             = "1"
    webhook_secret = "webhook_secret"
  }

  webhook_lambda_zip                = "lambdas-download/webhook.zip"
  runner_binaries_syncer_lambda_zip = "lambdas-download/runner-binaries-syncer.zip"
  runners_lambda_zip                = "lambdas-download/runners.zip"
  enable_organization_runners = true
}

ARM64 support: Specify an a1 or *6g* (6th-gen Graviton2) instance type to stand up an ARM64 runner, otherwise the default is x86_64.

Run terraform by using the following commands

terraform init
terraform apply

The terraform output displays the API gateway url (endpoint) and secret, which you need in the next step.

The lambda for syncing the GitHub distribution to S3 is triggered via CloudWatch (by default once per hour). After deployment the function is triggered via S3 to ensure the distribution is cached.

Setup the webhook / GitHub App (part 2)

At this point you have 2 options. Either create a separate webhook (enterprise, org, or repo), or create webhook in the App.

Option 1: Webhook

  1. Create a new webhook on repo level for repo level for repo level runner, or org (or enterprise level) for an org level runner.
  2. Provide the webhook url, should be part of the output of terraform.
  3. Provide the webhook secret (terraform output -raw <NAME_OUTPUT_VAR>).
  4. In the "Permissions & Events" section and then "Subscribe to Events" subsection, check either "Workflow Job" or "Check Run" (choose only 1 option!!!).
  5. In the "Install App" section, install the App in your organization, either in all or in selected repositories.

Option 2: App

Go back to the GitHub App and update the following settings.

  1. Enable the webhook.
  2. Provide the webhook url, should be part of the output of terraform.
  3. Provide the webhook secret (terraform output -raw <NAME_OUTPUT_VAR>).
  4. In the "Permissions & Events" section and then "Subscribe to Events" subsection, check either "Workflow Job" or "Check Run" (choose only 1 option!!!).

Install app

Finally you need to ensure the app is installed to all or selected repositories.

Go back to the GitHub App and update the following settings.

  1. In the "Install App" section, install the App in your organization, either in all or in selected repositories.

You are now ready to run action workloads on self hosted runner. Remember that builds will fail if there is no (offline) runner available with matching labels.

Encryption

The module support 2 scenarios to manage environment secrets and private key of the Lambda functions.

Encrypted via a module managed KMS key (default)

This is the default, no additional configuration is required.

Encrypted via a provided KMS key

You have to create an configure you KMS key. The module will use the context with key: Environment and value var.environment as encryption context.

resource "aws_kms_key" "github" {
  is_enabled = true
}

module "runners" {

  ...
  kms_key_arn = aws_kms_key.github.arn
  ...

Idle runners

The module will scale down to zero runners be default, by specifying a idle_config config idle runners can be kept active. The scale down lambda checks if any of the cron expressions matches the current time with a marge of 5 seconds. When there is a match the number of runners specified in the idle config will be kept active. In case multiple cron expressions matches only the first one is taken in to account. Below an idle configuration for keeping runners active from 9 to 5 on working days.

idle_config = [{
   cron      = "* * 9-17 * * 1-5"
   timeZone  = "Europe/Amsterdam"
   idleCount = 2
}]

Note: When using Windows runners it's recommended to keep a few runners warmed up due to the minutes-long cold start time.

Prebuilt Images

This module also allows you to run agents from a prebuilt AMI to gain faster startup times. You can find more information in the image README.md

Supported config

Cron expressions are parsed by cron-parser. The supported syntax.

*    *    *    *    *    *
┬    ┬    ┬    ┬    ┬    ┬
│    │    │    │    │    |
│    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
│    │    │    │    └───── month (1 - 12)
│    │    │    └────────── day of month (1 - 31)
│    │    └─────────────── hour (0 - 23)
│    └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, optional)

For time zones please check TZ database name column for the supported values.

Examples

Examples are located in the examples directory. The following examples are provided:

  • Default: The default example of the module
  • Permissions boundary: Example usages of permissions boundaries.
  • Ubuntu: Example usage of creating a runner using Ubuntu AMIs.
  • Prebuilt Images: Example usages of deploying runners with a custom prebuilt image.
  • Windows: Example usage of creating a runner using Windows as the OS.

Sub modules

The module contains several submodules, you can use the module via the main module or assemble your own setup by initializing the submodules yourself.

The following submodules are the core of the module and are mandatory:

The following sub modules are optional and are provided as example or utility:

ARM64 configuration for submodules

When not using the top-level module and specifying an a1 or *6g* (6th-gen Graviton2) instance_type, the runner-binaries-syncer and runners submodules need to be configured appropriately for pulling the ARM64 GitHub action runner binary and leveraging the arm64 AMI for the runners.

When configuring runner-binaries-syncer

  • runner_architecture - set to arm64, defaults to x64

When configuring runners

  • ami_filter - set to ["amzn2-ami-hvm-2*-arm64-gp2"], defaults to ["amzn2-ami-hvm-2.*-x86_64-ebs"]

Debugging

In case the setup does not work as intended follow the trace of events:

  • In the GitHub App configuration, the Advanced page displays all webhook events that were sent.
  • In AWS CloudWatch, every lambda has a log group. Look at the logs of the webhook and scale-up lambdas.
  • In AWS SQS you can see messages available or in flight.
  • Once an EC2 instance is running, you can connect to it in the EC2 user interface using Session Manager. Check the user data script using cat /var/log/user-data.log. By default several log files of the instances are streamed to AWS CloudWatch, look for a log group named <environment>/runners. In the log group you should see at least the log streams for the user data installation and runner agent.
  • Registered instances should show up in the Settings - Actions page of the repository or organization (depending on the installation mode).

Requirements

Name Version
terraform >= 0.14.1
aws >= 3.38

Providers

Name Version
aws >= 3.38
random n/a

Modules

Name Source Version
runner_binaries ./modules/runner-binaries-syncer
runners ./modules/runners
ssm ./modules/ssm
webhook ./modules/webhook

Resources

Name Type
aws_resourcegroups_group.resourcegroups_group resource
aws_sqs_queue.queued_builds resource
random_string.random resource

Inputs

Name Description Type Default Required
ami_filter List of maps used to create the AMI filter for the action runner AMI. By default amazon linux 2 is used. map(list(string)) {} no
ami_owners The list of owners used to select the AMI of action runner instances. list(string) 
[
  "amazon"
]
 no
aws_region AWS region. string n/a yes
block_device_mappings The EC2 instance block device configuration. Takes the following keys: device_name, delete_on_termination, volume_type, volume_size, encrypted, iops map(string) {} no
cloudwatch_config (optional) Replaces the module default cloudwatch log config. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html for details. string null no
create_service_linked_role_spot (optional) create the serviced linked role for spot instances that is required by the scale-up lambda. bool false no
delay_webhook_event The number of seconds the event accepted by the webhook is invisible on the queue before the scale up lambda will receive the event. number 30 no
disable_check_wokflow_job_labels Disable the the check of workflow labels for received workflow job events. bool false no
enable_cloudwatch_agent Enabling the cloudwatch agent on the ec2 runner instances, the runner contains default config. Configuration can be overridden via cloudwatch_config. bool true no
enable_organization_runners Register runners to organization, instead of repo level bool false no
enable_ssm_on_runners Enable to allow access the runner instances for debugging purposes via SSM. Note that this adds additional permissions to the runner instances. bool false no
environment A name that identifies the environment, used as prefix and for tagging. string n/a yes
ghes_ssl_verify GitHub Enterprise SSL verification. Set to 'false' when custom certificate (chains) is used for GitHub Enterprise Server (insecure). bool true no
ghes_url GitHub Enterprise Server URL. Example: https://github.internal.co - DO NOT SET IF USING PUBLIC GITHUB string null no
github_app GitHub app parameters, see your github app. Ensure the key is the base64-encoded .pem file (the output of base64 app.private-key.pem, not the content of private-key.pem). 
object({
    key_base64     = string
    id             = string
    webhook_secret = string
  })
 n/a yes
idle_config List of time period that can be defined as cron expression to keep a minimum amount of runners active instead of scaling down to 0. By defining this list you can ensure that in time periods that match the cron expression within 5 seconds a runner is kept idle. 
list(object({
    cron      = string
    timeZone  = string
    idleCount = number
  }))
 [] no
instance_profile_path The path that will be added to the instance_profile, if not set the environment name will be used. string null no
instance_type [DEPRECATED] See instance_types. string "m5.large" no
instance_types List of instance types for the action runner. list(string) null no
job_queue_retention_in_seconds The number of seconds the job is held in the queue before it is purged number 86400 no
key_name Key pair name string null no
kms_key_arn Optional CMK Key ARN to be used for Parameter Store. This key must be in the current account. string null no
lambda_s3_bucket S3 bucket from which to specify lambda functions. This is an alternative to providing local files directly. any null no
lambda_security_group_ids List of security group IDs associated with the Lambda function. list(string) [] no
lambda_subnet_ids List of subnets in which the action runners will be launched, the subnets needs to be subnets in the vpc_id. list(string) [] no
log_level Logging level for lambda logging. Valid values are 'silly', 'trace', 'debug', 'info', 'warn', 'error', 'fatal'. string "info" no
log_type Logging format for lambda logging. Valid values are 'json', 'pretty', 'hidden'. string "pretty" no
logging_retention_in_days Specifies the number of days you want to retain log events for the lambda log group. Possible values are: 0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, and 3653. number 180 no
market_options Market options for the action runner instances. Setting the value to null let the scaler create on-demand instances instead of spot instances. string "spot" no
minimum_running_time_in_minutes The time an ec2 action runner should be running at minimum before terminated if not busy. number 5 no
repository_white_list List of repositories allowed to use the github app list(string) [] no
role_path The path that will be added to role path for created roles, if not set the environment name will be used. string null no
role_permissions_boundary Permissions boundary that will be added to the created roles. string null no
runner_additional_security_group_ids (optional) List of additional security groups IDs to apply to the runner list(string) [] no
runner_allow_prerelease_binaries Allow the runners to update to prerelease binaries. bool false no
runner_as_root Run the action runner under the root user. bool false no
runner_binaries_s3_sse_configuration Map containing server-side encryption configuration for runner-binaries S3 bucket. any {} no
runner_binaries_syncer_lambda_timeout Time out of the binaries sync lambda in seconds. number 300 no
runner_binaries_syncer_lambda_zip File location of the binaries sync lambda zip file. string null no
runner_boot_time_in_minutes The minimum time for an EC2 runner to boot and register as a runner. number 5 no
runner_ec2_tags Map of tags that will be added to the launch template instance tag specificatons. map(string) {} no
runner_egress_rules List of egress rules for the GitHub runner instances. 
list(object({
    cidr_blocks      = list(string)
    ipv6_cidr_blocks = list(string)
    prefix_list_ids  = list(string)
    from_port        = number
    protocol         = string
    security_groups  = list(string)
    self             = bool
    to_port          = number
    description      = string
  }))
 
[
  {
    "cidr_blocks": [
      "0.0.0.0/0"
    ],
    "description": null,
    "from_port": 0,
    "ipv6_cidr_blocks": [
      "::/0"
    ],
    "prefix_list_ids": null,
    "protocol": "-1",
    "security_groups": null,
    "self": null,
    "to_port": 0
  }
]
 no
runner_extra_labels Extra labels for the runners (GitHub). Separate each label by a comma string "" no
runner_group_name Name of the runner group. string "Default" no
runner_iam_role_managed_policy_arns Attach AWS or customer-managed IAM policies (by ARN) to the runner IAM role list(string) [] no
runner_log_files (optional) Replaces the module default cloudwatch log config. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html for details. 
list(object({
    log_group_name   = string
    prefix_log_group = bool
    file_path        = string
    log_stream_name  = string
  }))
 
[
  {
    "file_path": "/var/log/messages",
    "log_group_name": "messages",
    "log_stream_name": "{instance_id}",
    "prefix_log_group": true
  },
  {
    "file_path": "/var/log/user-data.log",
    "log_group_name": "user_data",
    "log_stream_name": "{instance_id}",
    "prefix_log_group": true
  },
  {
    "file_path": "/home/ec2-user/actions-runner/diag/Runner**.log",
    "log_group_name": "runner",
    "log_stream_name": "{instance_id}",
    "prefix_log_group": true
  }
]
 no
runner_metadata_options Metadata options for the ec2 runner instances. map(any) 
{
  "http_endpoint": "enabled",
  "http_put_response_hop_limit": 1,
  "http_tokens": "optional"
}
 no
runners_lambda_s3_key S3 key for runners lambda function. Required if using S3 bucket to specify lambdas. any null no
runners_lambda_s3_object_version S3 object version for runners lambda function. Useful if S3 versioning is enabled on source bucket. any null no
runners_lambda_zip File location of the lambda zip file for scaling runners. string null no
runners_maximum_count The maximum number of runners that will be created. number 3 no
runners_scale_down_lambda_timeout Time out for the scale down lambda in seconds. number 60 no
runners_scale_up_lambda_timeout Time out for the scale up lambda in seconds. number 180 no
scale_down_schedule_expression Scheduler expression to check every x for scale down. string "cron(*/5 * * * ? *)" no
scale_up_reserved_concurrent_executions Amount of reserved concurrent executions for the scale-up lambda function. A value of 0 disables lambda from being triggered and -1 removes any concurrency limitations. number 1 no
subnet_ids List of subnets in which the action runners will be launched, the subnets needs to be subnets in the vpc_id. list(string) n/a yes
syncer_lambda_s3_key S3 key for syncer lambda function. Required if using S3 bucket to specify lambdas. any null no
syncer_lambda_s3_object_version S3 object version for syncer lambda function. Useful if S3 versioning is enabled on source bucket. any null no
tags Map of tags that will be added to created resources. By default resources will be tagged with name and environment. map(string) {} no
enabled_userdata Should the userdata script be enabled for the runner. Set this to false if you are using your own prebuilt AMI bool true no
userdata_post_install Script to be ran after the GitHub Actions runner is installed on the EC2 instances string "" no
userdata_pre_install Script to be ran before the GitHub Actions runner is installed on the EC2 instances string "" no
userdata_template Alternative user-data template, replacing the default template. By providing your own user_data you have to take care of installing all required software, including the action runner. Variables userdata_pre/post_install are ignored. string null no
volume_size Size of runner volume number 30 no
vpc_id The VPC for security groups of the action runners. string n/a yes
webhook_lambda_s3_key S3 key for webhook lambda function. Required if using S3 bucket to specify lambdas. any null no
webhook_lambda_s3_object_version S3 object version for webhook lambda function. Useful if S3 versioning is enabled on source bucket. any null no
webhook_lambda_timeout Time out of the webhook lambda in seconds. number 10 no
webhook_lambda_zip File location of the webhook lambda zip file. string null no

Outputs

Name Description
binaries_syncer n/a
runners n/a
ssm_parameters n/a
webhook n/a

Contribution

We welcome contribution, please checkout the contribution guide. Be-aware we use pre commit hooks to update the docs.

Philips Forest

This module is part of the Philips Forest.

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