docker-compose.yml

version: '3'
# See https://docs.docker.com/compose/overview/ for more information.

# If you make changes to this file or any related files, apply them by
# navigating to the directory that holds this file and run this as root:
#   docker-compose down; docker-compose up -d

# Create a network for our containers.
networks:
  frontend:

# Create persistent Docker volumes to preserve important data.
# We don't want our data to be lost when restarting containers.
volumes:
  # For storing GitLab's configuration files:
  vol-gitlab-config:
  # For storing GitLab's logs:
  vol-gitlab-logs:
  # For storing GitLab's application data:
  vol-gitlab-data:

# Create our containers.
services:
  # Watchtower detects if any linked containers have an new image
  # available, automatically updating & restarting them if needed.
  watchtower:
    # https://hub.docker.com/r/centurylink/watchtower/
    image: v2tec/watchtower:latest
    # https://github.com/v2tec/watchtower#options
    # This schedule applies updates (if available) at midnight.
    command: --cleanup --schedule "0 0 0 * * *"
    restart: always
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

  # The main front-end application.
  gitlab:
    # To stick to a specific version, replace "latest" with a tag from:
    # https://hub.docker.com/r/gitlab/gitlab-ce/tags/
    image: gitlab/gitlab-ce:latest
    restart: always
    hostname: "${GITLAB_DOMAIN}"
    ports:
      - "22:22"    # Change to "2222:22" if the host needs port 22.
      - "80:80"
      - "443:443"
    networks:
      - frontend
    volumes:
      # Ensure GitLab content persist between restarts.
      - vol-gitlab-config:/etc/gitlab
      - vol-gitlab-logs:/var/log/gitlab
      - vol-gitlab-data:/var/opt/gitlab
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        # Add gitlab.rb configuration here, each on its own line.
        # See: https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-config-template/gitlab.rb.template
        external_url 'http://${GITLAB_DOMAIN}'
        letsencrypt['enable'] = false
        # Configure headers for outgoing email.
        gitlab_rails['gitlab_email_enabled'] = true
        gitlab_rails['gitlab_email_from'] = 'no-reply@${GITLAB_DOMAIN}'
        gitlab_rails['gitlab_email_display_name'] = 'GitLab'
        gitlab_rails['gitlab_email_reply_to'] = 'no-reply@${GITLAB_DOMAIN}'
        # Send outgoing email via the SMTP container:
        gitlab_rails['smtp_enable'] = true
        gitlab_rails['smtp_address'] = "mail"
        gitlab_rails['smtp_port'] = 25
        gitlab_rails['smtp_tls'] = false
        # Limit backup lifetime to 7 days (604800 seconds):
        gitlab_rails['backup_keep_time'] = 604800

  # This allows GitLab to send email straight out of the box without
  # having to rely on an external provider like SendGrid or MailGun.
  # It makes an SMTP host available at the hostname "mail".
  mail:
    image: bytemark/smtp
    restart: always
    networks:
      - frontend