WIP: Work in progress, conversion to Terraform 0.12 #73. Feel free to checkout branch Terraform 0.12.
NEW: The runner will register itself automatically to GitLab. No need to register the runner first, see also the examples
This repo contains a Terraform module and examples to run a GitLab CI multi runner on AWS Spot instances. See the blog post at 040code for a detailed description of the setup.
The setup is based on the blog post: Auto scale GitLab CI runners and save 90% on EC2 costs The gitlab-ci runners that this project creates will be configured to use a shared cache via S3 by default. Additionally their logs will be streamed to CloudWatch. The s3 stored cache expiration is configurable and is set to expire in X days by default. Logging can be disabled. The accompanying post mentions that you have to register the the runner before running the Terraform scripts. Since version 3+ this is no longer required. You can simply define the runner configuration, including the runner registration token, via terraform.
In addition to the auto scaling option (docker+machine executor) the docker executor is supported for a single node.
Ensure you have Terraform installed, see .terraform-version for the used version. A handy tool to mange your Terraform version is tfenv.
On macOS it is simple to install tfenv using brew.
brew install tfenvNext install a Terraform version.
tfenv install <version>Export your AWS Security Credentials:
export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...The gitlab runner EC2 instance requires the following service linked roles:
- AWSServiceRoleForAutoScaling
- AWSServiceRoleForEC2Spot
By default the EC2 instance is allowed to create the required roles, but this can be disabled by setting the option allow_iam_service_linked_role_creation to false. If disabled you must ensure the roles exist. You can create them manually or via Terraform.
resource "aws_iam_service_linked_role" "spot" {
aws_service_name = "spot.amazonaws.com"
}
resource "aws_iam_service_linked_role" "autoscaling" {
aws_service_name = "autoscaling.amazonaws.com"
}By default the runner is registered on initial deployment. In previous versions of this module this was a manual process. The manual process is still supported but will be removed in future releases. The runner token will be stored in the parameter store. See example for more details.
To register the runner automatically set the variable gitlab_runner_registration_config["token"]. This token value can be found in your GitLab project, group, or global settings. For a generic runner you can find the token in the admin section. By default the runner will be locked to the target project, not run untagged. Below is an example of the configuration map.
gitlab_runner_registration_config = {
registration_token = "<registration token>"
tag_list = "<your tags, comma separated>"
description = "<some description>"
locked_to_project = "true"
run_untagged = "false"
maximum_timeout = "3600"
}For migration to the new setup simply add the runner token to the parameter store. Once the runner is started it will lookup the required values via the parameter store. If the value is null a new runner will be created.
# set the following variables, look up the variables in your Terraform config.
# see your Terraform variables to fill in the vars below.
aws-region=<${var.aws_region}>
token=<runner-token-see-your-gitlab-runner>
parameter-name=<${var.environment}>-<${var.secure_parameter_store_runner_token_key}>
aws ssm put-parameter --overwrite --type SecureString --name "${parameter-name}" --value ${token} --region "${aws-region}"Once you have created the parameter, you must remove the variable runners_token from your config. The next time your gitlab runner instance is created it will look up the token from the SSM parameter store.
Finally, the runner still supports the manual runner creation. No changes are required. Please keep in mind that this setup will be removed in future releases.
Update the variables in terraform.tfvars according to your needs and add the following variables. See the previous step for instructions on how to obtain the token.
runner_name = "NAME_OF_YOUR_RUNNER"
gitlab_url = "GITLAB_URL"
runner_token = "RUNNER_TOKEN"The base image used to host the GitLab Runner agent is the latest available Amazon Linux HVM EBS AMI. In previous versions of this module a hard coded list of AMIs per region was provided. This list has been replaced by a search filter to find the latest AMI. Setting the filter to amzn-ami-hvm-2018.03.0.20180622-x86_64-ebs will allow you to version lock the target AMI.
module "runner" {
source = "npalm/gitlab-runner/aws"
version = "3.2.0"
aws_region = "${var.aws_region}"
environment = "${var.environment}"
ssh_public_key = "${file("${var.ssh_key_file}")}"
vpc_id = "${module.vpc.vpc_id}"
subnet_ids_gitlab_runner = "${module.vpc.private_subnets}"
subnet_id_runners = "${element(module.vpc.private_subnets, 0)}"
runners_name = "my-spot-runner"
runners_gitlab_url = "https://www.gitlab.com"
gitlab_runner_registration_config = {
registration_token = "<YOUR_TOKEN>"
tag_list = "docker_spot_runner"
description = "Docker AWS Spot runner"
locked_to_project = "true"
run_untagged = "false"
maximum_timeout = "3600"
}
runners_off_peak_timezone = "Europe/Amsterdam"
runners_off_peak_idle_count = 0
runners_off_peak_idle_time = 60
# working 9 to 5 :)
runners_off_peak_periods = "[\"* * 0-9,17-23 * * mon-fri *\", \"* * * * * sat,sun *\"]"
}A few examples are provided. Use the following steps to deploy. Ensure your AWS and Terraform environment is set up correctly. All commands below should be run from the terraform-aws-gitlab-runner/examples directory.
SSH keys are generated by Terraform and stored in the generated directory of each example directory.
This step is not needed anymore Configure you runner via gitlab_runner_registration_config. Configuring GitLab via the step below is only needed when you choose to create the token manually and set the runners_token variable.
Register a new runner:
docker run -it --rm gitlab/gitlab-runner registerOnce done, lookup the token in GitLab and update the terraform.tfvars file.
Run terraform init to initialize Terraform. Next you can run terraform plan to inspect the resources that will be created.
To create the runner run:
terraform applyTo destroy runner:
terraform destroy| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| allow_iam_service_linked_role_creation | Boolean used to control attaching the policy to a runner instance to create service linked roles. | string | "true" |
no |
| ami_filter | List of maps used to create the AMI filter for the Gitlab runner agent AMI. Currently Amazon Linux 2 amzn2-ami-hvm-2.0.????????-x86_64-ebs looks to not be working for this configuration. |
list | <list> |
no |
| ami_owners | The list of owners used to select the AMI of Gitlab runner agent instances. | list | <list> |
no |
| aws_region | AWS region. | string | n/a | yes |
| aws_zone | AWS availability zone (typically 'a', 'b', or 'c'). | string | "a" |
no |
| cache_bucket_prefix | Prefix for s3 cache bucket name. | string | "" |
no |
| cache_bucket_versioning | Boolean used to enable versioning on the cache bucket, false by default. | string | "false" |
no |
| cache_expiration_days | Number of days before cache objects expires. | string | "1" |
no |
| cache_shared | Enables cache sharing between runners, false by default. | string | "false" |
no |
| create_runners_iam_instance_profile | Boolean to control the creation of the runners IAM instance profile | string | "true" |
no |
| docker_machine_instance_type | Instance type used for the instances hosting docker-machine. | string | "m5a.large" |
no |
| docker_machine_options | List of additional options for the docker machine config. Each element of this list must be a key=value pair. E.g. '["amazonec2-zone=a"]' | list | <list> |
no |
| docker_machine_spot_price_bid | Spot price bid. | string | "0.06" |
no |
| docker_machine_user | Username of the user used to create the spot instances that host docker-machine. | string | "docker-machine" |
no |
| docker_machine_version | Version of docker-machine. | string | "0.16.1" |
no |
| enable_cloudwatch_logging | Boolean used to enable or disable the CloudWatch logging. | string | "true" |
no |
| enable_gitlab_runner_ssh_access | Enables SSH Access to the gitlab runner instance. | string | "false" |
no |
| enable_manage_gitlab_token | Boolean to enable the management of the GitLab token in SSM. If true the Gitlab token will be managed via terraform state. If false the token will still be stored in SSM however, it will not be managed via terraform. |
string | "true" |
no |
| environment | A name that identifies the environment, used as prefix and for tagging. | string | n/a | yes |
| gitlab_runner_registration_config | Configuration used to register the runner. See the README for an example, or reference the examples in the examples directory of this repo. | map | <map> |
no |
| gitlab_runner_ssh_cidr_blocks | List of CIDR blocks to allow SSH Access from to the gitlab runner instance. | list | <list> |
no |
| gitlab_runner_version | Version of the GitLab runner. | string | "11.11.2" |
no |
| instance_role_json | Docker machine runner instance override policy, expected to be in JSON format. | string | "" |
no |
| instance_role_runner_json | Instance role json for the docker machine runners to override the default. | string | "" |
no |
| instance_type | Instance type used for the GitLab runner. | string | "t3.micro" |
no |
| name_runners_docker_machine | string | "" |
no | |
| overrides | This maps provides the possibility to override some defaults. The following attributes are supported: name_sg overwrite the Name tag for all security groups created by this module. name_runner_agent_instance override the Name tag for the ec2 instance defined in the auto launch configuration. name_docker_machine_runners ovverrid the Name tag spot instances created by the runner agent. |
map | <map> |
no |
| runner_instance_spot_price | By setting a spot price bid price the runner agent will be created via a spot request. Be aware that spot instances can be stopped by AWS. | string | "" |
no |
| runners_concurrent | Concurrent value for the runners, will be used in the runner config.toml. | string | "10" |
no |
| runners_environment_vars | Environment variables during build execution, e.g. KEY=Value, see runner-public example. Will be used in the runner config.toml | list | <list> |
no |
| runners_executor | The executor to use. Currently supports docker+machine or docker. |
string | "docker+machine" |
no |
| runners_gitlab_url | URL of the GitLab instance to connect to. | string | n/a | yes |
| runners_iam_instance_profile_name | IAM instance profile name of the runners, will be used in the runner config.toml | string | "" |
no |
| runners_idle_count | Idle count of the runners, will be used in the runner config.toml. | string | "0" |
no |
| runners_idle_time | Idle time of the runners, will be used in the runner config.toml. | string | "600" |
no |
| runners_image | Image to run builds, will be used in the runner config.toml | string | "docker:18.03.1-ce" |
no |
| runners_limit | Limit for the runners, will be used in the runner config.toml. | string | "0" |
no |
| runners_monitoring | Enable detailed cloudwatch monitoring for spot instances. | string | "false" |
no |
| runners_name | Name of the runner, will be used in the runner config.toml. | string | n/a | yes |
| runners_off_peak_idle_count | Off peak idle count of the runners, will be used in the runner config.toml. | string | "0" |
no |
| runners_off_peak_idle_time | Off peak idle time of the runners, will be used in the runner config.toml. | string | "0" |
no |
| runners_off_peak_periods | Off peak periods of the runners, will be used in the runner config.toml. | string | "" |
no |
| runners_off_peak_timezone | Off peak idle time zone of the runners, will be used in the runner config.toml. | string | "" |
no |
| runners_output_limit | Sets the maximum build log size in kilobytes, by default set to 4096 (4MB) | string | "4096" |
no |
| runners_post_build_script | Commands to be executed on the Runner just after executing the build, but before executing after_script. | string | "" |
no |
| runners_pre_build_script | Script to execute in the pipeline just before the build, will be used in the runner config.toml | string | "" |
no |
| runners_pre_clone_script | Commands to be executed on the Runner before cloning the Git repository. this can be used to adjust the Git client configuration first, for example. | string | "" |
no |
| runners_privileged | Runners will run in privileged mode, will be used in the runner config.toml | string | "true" |
no |
| runners_request_concurrency | Limit number of concurrent requests for new jobs from GitLab (default 1) | string | "1" |
no |
| runners_root_size | Runner instance root size in GB. | string | "16" |
no |
| runners_shm_size | shm_size for the runners. will be used in the runner config.toml | string | "0" |
no |
| runners_token | Token for the runner, will be used in the runner config.toml. | string | "__REPLACED_BY_USER_DATA__" |
no |
| runners_use_private_address | Restrict runners to the use of a private IP address | string | "true" |
no |
| secure_parameter_store_runner_token_key | The key name used store the Gitlab runner token in Secure Parameter Store | string | "runner-token" |
no |
| ssh_public_key | Public SSH key used for the GitLab runner EC2 instance. | string | n/a | yes |
| subnet_id_runners | List of subnets used for hosting the gitlab-runners. | string | n/a | yes |
| subnet_ids_gitlab_runner | Subnet used for hosting the GitLab runner. | list | n/a | yes |
| tags | Map of tags that will be added to created resources. By default resources will be tagged with name and environment. | map | <map> |
no |
| userdata_post_install | User-data script snippet to insert after GitLab runner install | string | "" |
no |
| userdata_pre_install | User-data script snippet to insert before GitLab runner install | string | "" |
no |
| vpc_id | The target VPC for the docker-machine and runner instances. | string | n/a | yes |
| Name | Description |
|---|---|
| runner_agent_role | ARN of the rule used for the ec2 instance for the GitLab runner agent. |
| runner_as_group_name | Name of the autoscaling group for the gitlab-runner instance |
| runner_cache_bucket_arn | ARN of the S3 for the build cache. |
| runner_role | ARN of the rule used for the docker machine runners. |