Gitlab Runner Config EC2Machine

config.toml

concurrent = 4
check_interval = 0

[[runners]]
  name = "gitlab-runner-autoscaler"
  url = "https://gitlab.com" #TODO_1: Change with your gitlab repository URL
  token = "" #TODO_2: Fill with your Gitlab Token
  executor = "docker+machine"
  limit = 4
  [runners.docker]
    tls_verify = false
    image = "docker:20.10.24-dind-alpine3.18"
    privileged = true
    volumes = ["/cache","/var/run/docker.sock:/var/run/docker.sock"]
    disable_cache = true
    shm_size = 0
  [runners.cache]
    Type = "s3"
    Path = "cache"
    Shared = true
    [runners.cache.s3] #TODO_3: Change with your S3 Bucket, Access and Secret Key
      ServerAddress = "s3.amazonaws.com"
      AccessKey = "your-access-key" #Changeme
      SecretKey = "your-secret-key" #Changeme
      BucketName = "s3-cache-bucket-name"  #Changeme
      BucketLocation = "ap-southeast-1"
  [runners.machine]
    MachineDriver = "amazonec2"
    MachineName = "gitlab-ci-machine-%s"
    OffPeakTimezone = ""
    OffPeakIdleCount = 0
    OffPeakIdleTime = 0
    IdleCount = 0 #Changeme (optional)
    #TODO_4: Change with your gitlab-runner-manager IAM Roles, Access, Secret Key, VPC, subnet, security group and instance type
    MachineOptions = [
      "amazonec2-access-key=your-access-key", #Changeme
      "amazonec2-secret-key=your-secret-key", #Changeme
      "amazonec2-region=us-east-2", #Changeme
      "amazonec2-vpc-id=vpc-0175846a", #Changeme
      "amazonec2-subnet-id=subnet-dbb6afb3", #Changeme
      "amazonec2-zone=a", #Changeme
      "amazonec2-use-private-address=true",
      "amazonec2-tags=runner-manager-name,gitlab-aws-autoscaler,gitlab,true,gitlab-runner-autoscale,true",
      "amazonec2-security-group=gitlab-runner-instance-worker", #Changeme: Security security group with port 22 (ssh), 2376 (docker-machine-port) open
      "amazonec2-instance-type=t3.medium", #Changeme (optional)
      "amazonec2-ami=ami-0fa377108253bf620", #Ubuntu 22.04 LTS, ap-southeast-1, change with your correct AMI ID see more: https://cloud-images.ubuntu.com/locator/ec2/
      "amazonec2-request-spot-instance=true",
      "amazonec2-spot-price=0.03", #Changeme (optional)
      "amazonec2-block-duration-minutes=0", #Changeme (optional)
      "engine-install-url='https://releases.rancher.com/install-docker/20.10.24.sh'"
    ]

Docker Engine 23.0+ Error Issue

As of this morning, the latest Docker release (23.0) caused issues with the docker-machine fork, resulting in GitLab Runner not being able to create autoscaling runners using the docker+machine executor. The issue is captured in #98 (closed). Many of us were using an older version of docker-machine as a workaround for the problem described in this issue, but since we now have to update to the latest release this is no longer possible.

https://gitlab.com/gitlab-org/ci-cd/docker-machine/-/issues/109#note_1325863864

Change default Gitlab Runner image 20.10.24-dind-alpine3.18