Terraform Module: AWS GitHub Action Runner

This Terraform module deploys autoscaling, self-hosted GitHub Action runners on dedicated EC2 instances. It is an extension of the popular philips-labs/github-runner/aws module, with additional features to add value to your GitHub Action runners.

Features

• Auto-Scaling Runners: Automatically scales the number of runners based on demand.
• Ephemeral Runners: Provides an option to use ephemeral runners that are destroyed after use.
• Tag-Based Runner Assignment: Uses tags to assign runners to specific tasks.
• Custom Runner Configuration: Allows custom configuration of runners, including instance types, AMIs, and more.
• Instance Store RAID: If more than 2 instance stores are detected, they are combined into a RAID0 configuration for improved performance.
• Automated Docker Login: If custom Docker authentication is configured, the runners will automatically perform a docker login.

Usage

module"github_runner" {
source="cruxstack/github-runner/aws"version="x.x.x"github_app_secrets={
id ="your_github_app_id"
key ="your_github_app_key"
}
github_organization="your_github_organization_name"
}

Inputs

In addition to the variables documented below, this module includes several other optional variables (e.g., name, tags, etc.) provided by the cloudposse/label/null module. Please refer to the cloudposse/label documentation for more details on these variables.

Name	Description	Type	Default	Required
github_app_secrets	Object containing id and key for the GitHub app.	object	n/a	yes
github_organization	Name of the GitHub organization.	string	n/a	yes
github_app_webhook_password	Password for the GitHub app webhook. An empty string implies a randomly generated password.	string	""	no
github_organization_runner_enabled	Toggle to activate runners for all projects in the organization.	bool	true	no
runner_binaries_path	Path to the GitHub Action runner binaries saved locally before pushed to S3.	string	""	no
runner_ephemeral_mode_enabled	Toggle to activate ephemeral runners.	bool	false	no
runner_os	Operating system for the GitHub Action runner.	string	"linux"	no
instance_ami_name	Name of the Amazon Machine Image (AMI) for the GitHub Action runner.	string	"al2023-ami-2023.*-kernel-*-x86_64"	no
instance_types	Set of instance types for the action runner.	set(string)	["m5ad.large", "m5d.large"]	no
instance_lifecycle_type	Lifecycle type for action runner instances. Options: spot or on-demand.	string	"spot"	no
log_retention	Retention period (in days) for logs in CloudWatch.	number	90	no
vpc_id	ID of the Virtual Private Cloud (VPC).	string	n/a	yes
vpc_subnet_ids	List of subnet IDs within the VPC.	list(string)	n/a	yes
aws_region_name	AWS region.	string	""	no
aws_account_id	AWS account ID.	string	""	no
aws_kv_namespace	Namespace or prefix for AWS SSM parameters and similar resources.	string	""	no

Outputs

Name	Description
runners	Information about the runner resources created.
webhook_endpoint	Endpoint for the webhook resources.
webhook_password	Password for the webhook resources.

Contributing

We welcome contributions to this project. For information on setting up a development environment and how to make a contribution, see CONTRIBUTING documentation.