terraform-aws-gitlab-runner

Table of contents

1. Overview
2. AWS GitLab Runner Terraform
   • Inputs
   • Registration config
   • Outputs
3. Example
   • Obtain a Registration Token
   • Add a .gitlab-ci.yml to a project
   • Declare the module
4. License

Overview

This module creates a simple GitLab CI Runner using a Docker executor on a long-lived AWS EC2 instance in an Auto Scaling Group.

AWS GitLab Runner Terraform

Inputs

The below outlines the current parameters and defaults.

Name	Description	Type	Default	Required
vpc_id	The target VPC for hosting the GitLab Runner	string	""	Yes
subnet_ids	List of subnets for hosting the GitLab Runner	list(string)	""	Yes
key_name	The name of the EC2 key pair to use	string	default	No
enable_ssh_access	Enables SSH access to the GitLab Runner	bool	false	No
ssh_cidr_blocks	List of CIDR blocks to use if allowing SSH Access to the GitLab Runner	list(string)	[0.0.0.0/0]	No
gitlab_runner_registration_config	Configuration used to register the runner	map(string)	(map)	No
gitlab_runner_concurrency	Maximum number of jobs to allow the GitLab Runner to run concurrently	number	5	No

Registration config

In the gitlab_runner_registration_config variable pass the details needed to register the GitLab Runner. It accepts four keys:

• url - the GitLab URL e.g. https://gitlab.com
• name - the name of the GitLab Runner. This is informational only and forms the description
• registration_token - the Registration Token. See below for instructions on generating this
• docker_image - the Docker Image to be used by the Docker Executor e.g. alpine:latest

Outputs

None.

Example

Obtain a Registration Token

See the GitLab docs here.

• Go to the project in GitLab e.g. https://gitlab.com/alexharv074/test
• On the left hand side select Settings > CI/CD
• Under Runners Expand.

The registration token can be found from here.

Put the token in a tfvars file or in an environment variable:

▶ export TF_VAR_registration_token=XXXXXXXXX

Add a .gitlab-ci.yml to a project

Create a simple .gitlab-ci.yml file in the root of your project e.g.

---
image: busybox:latest

build1:
  stage: build
  script:
    - echo "hello world"

Declare the module

Here is an example usage:

variable "registration_token" {}

variable "enable_ssh_access" {
  default = false
}

variable "vpc_id" {}
variable "subnet_ids" {
  type = list(string)
}

variable "key_name" {}

module "runner" {
  source = "git@github.com:cmdlabs/terraform-aws-gitlab-runner.git"

  key_name   = var.key_name
  vpc_id     = var.vpc_id
  subnet_ids = var.subnet_ids

  gitlab_runner_concurrency = 10

  gitlab_runner_registration_config = {
    url                = "https://gitlab.com"
    name               = "test-runner"
    registration_token = var.registration_token
    docker_image       = "alpine:latest"
  }

  enable_ssh_access = var.enable_ssh_access
}

Apply that:

▶ terraform apply

License

Apache 2.0.