Docker Flow example for Docker Swarm

docker-flow-stack.yml

# Deploy using `docker stack deploy -f docker-flow-stack.yml docker_flow`
version: '3.7'

networks:
  network:  # Allows referring to 'docker_flow_network' on other stacks

services:
  proxy:
    image: dockerflow/docker-flow-proxy:19.03.02-16
    ports:
      - 80:80
      - 443:443
    networks:
      - network
    environment:
      LISTENER_ADDRESS: swarm_listener
      MODE: swarm
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == worker

  swarm_listener:
    image: dockerflow/docker-flow-swarm-listener:19.01.12-20
    networks:
      - network
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      DF_NOTIFY_CREATE_SERVICE_URL: http://proxy:8080/v1/docker-flow-proxy/reconfigure
      DF_NOTIFY_REMOVE_SERVICE_URL: http://proxy:8080/v1/docker-flow-proxy/remove
    deploy:
      placement:
        constraints:
          - node.role == manager

example-stack.yml

# Deploy using `docker stack deploy -f example-stack.yml example`

version: '3.7'

networks:
  docker_flow_network:
    external: true

services:
  migrate: &app
    image: your/image:latest
    command: rails db:migrate
    environment:
      RAILS_MAX_THREADS: 25
      RAILS_LOG_TO_STDOUT: "true"
      RAILS_SERVE_STATIC_FILES: "true"
      DATABASE_URL: postgres://postgres@some-postgres-host:5432/example_production
      RAILS_FORCE_SSL: "true"
    deploy: &app_deploy
      placement:
        constraints:
        - node.role == worker
      resources: { reservations: { memory: "128M" }, limits: { memory: "256M" } }
      restart_policy:
        condition: on-failure
        max_attempts: 3
        delay: 5s

  web:
    <<: *app
    command: puma -t 2:25 -w 2 -p 3000 -e production
    networks:
    - docker_flow_network
    deploy:
      <<: *app_deploy
      labels:
        - com.df.notify=true
        - com.df.distribute=true
        - com.df.servicePath=/
        - com.df.serviceDomain=your.example.com,your.example.org
        - com.df.port=3000