gitlab-runner.yml

---
  # Install Gitlab Runner
  # see https://docs.gitlab.com/runner/install/linux-repository.html#installing-the-runner
  - name: Add the GitLab Runner package repository
    shell: "curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | sudo bash"

  - name: Install GitLab Runner package
    apt:
      name: gitlab-runner
      state: latest

  # To register the Gitlab Runner, we need to obtain the Registration Token from our Gitlab instance
  # Because this will change every time we start up Gitlab (and/or Vagrant Box/Ansible setup, see https://gitlab.com/gitlab-org/gitlab-ce/issues/3703)
  # we need to access it somehow. Sadly there´s no API atm (see https://gitlab.com/gitlab-org/gitlab-ce/issues/24030,
  # https://gitlab.com/gitlab-org/gitlab-runner/issues/1727), so we have to dive directly into the Gitlab database :(
  - name: Extract Runner Registration Token directly from gitlab-rails console
    become: true
    shell: |
      echo "Gitlab::CurrentSettings.current_application_settings.runners_registration_token" |
      gitlab-rails console --environment=production
    register: gitlab_runner_registration_token_result

  - name: Parse token from response
    set_fact:
      gitlab_runner_registration_token: "{{ gitlab_runner_registration_token_result.stdout | regex_search(regexp, '\\1') | list | first }}"
    vars:
      regexp: 'runners_registration_token\n\"([^\"]+)'

  - name: And the Token is...
    debug:
      msg: "{{gitlab_runner_registration_token}}"

  # Register Gitlab Runner
  - name: Unregister all previously used Gitlab Runners
    shell: "gitlab-runner unregister --all-runners"

  - name: Add gitlab-runner user to docker group
    user:
      name: gitlab-runner
      groups: docker
      append: yes
    become: true

  # see https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#use-shell-executor
  # and this for non-interactive mode:
  # https://gitlab.com/gitlab-org/gitlab-runner/blob/master/docs/commands/README.md#non-interactive-registration
  - name: Register Gitlab-Runners using shell executor
    shell: "gitlab-runner register --non-interactive --url '{{gitlab_url}}' --registration-token '{{gitlab_runner_registration_token}}' --description 'shell-runner-{{ item }}' --executor shell --tag-list shell"
    loop: "{{ range(1,gitlab_runner_count + 1)|list }}"

  # see https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#use-docker-in-docker-workflow-with-docker-executor
  - name: Register Gitlab-Runners using docker executor too
    shell: "gitlab-runner register --non-interactive --url '{{gitlab_url}}' --registration-token '{{gitlab_runner_registration_token}}' --description 'docker-in-docker-runner-{{ item }}' --executor docker --docker-image 'docker:19.03.1' --docker-privileged --docker-volumes '/certs/client' --tag-list dind"
    loop: "{{ range(1,gitlab_runner_count + 1)|list }}"

  # number of concurrent runners needs to be set directly in config-file in order to actually run jobs in parallel
  # see: https://gitlab.com/gitlab-org/gitlab-runner/issues/1539
  - name: set concurrent number of runners in gitlab-runner config
    ini_file:
      path: /etc/gitlab-runner/config.toml
      section: 
      option: concurrent
      value: "{{ gitlab_runner_count }}"

  - name: Retrieve all registered Gitlab Runners
    shell: "gitlab-runner list"
    register: runner_result

  - name: Show all registered Gitlab Runners
    debug:
      msg:
       - "{{runner_result.stderr_lines}}"