源码 https://github.com/dockersamples/example-voting-app

    1. version: "3"
    2. services:
    4.   redis:
    5.     image: redis:alpine
    6.     networks:
    7.       - frontend
    8.     deploy:                                                    # 设置
    9.       replicas: 1                                        # 设置 replicas 服务的个数
    10.       update_config:                                # 更新的配置
    11.         parallelism: 2                            # 调度程序同时更新的最大服务任务数
    12.         delay: 10s                                    # 标志配置更新服务任务或任务集之间的时间延迟
    13.       restart_policy:
    14.         condition: on-failure
    15.   db:
    16.     image: postgres:9.4
    17.     environment:
    18.       POSTGRES_USER: "postgres"
    19.       POSTGRES_PASSWORD: "postgres"
    20.     volumes:
    21.       - db-data:/var/lib/postgresql/data
    22.     networks:
    23.       - backend
    24.     deploy:
    25.       placement:
    26.         constraints: [node.role == manager]        # 指定 db 只能部署在 manager 节点上
    27.   vote:
    28.     image: dockersamples/examplevotingapp_vote:before
    29.     ports:
    30.       - 5000:80
    31.     networks:
    32.       - frontend
    33.     depends_on:
    34.       - redis
    35.     deploy:
    36.       replicas: 2
    37.       update_config:
    38.         parallelism: 2
    39.       restart_policy:
    40.         condition: on-failure
    41.   result:
    42.     image: dockersamples/examplevotingapp_result:before
    43.     ports:
    44.       - 5001:80
    45.     networks:
    46.       - backend
    47.     depends_on:
    48.       - db
    49.     deploy:
    50.       replicas: 1
    51.       update_config:
    52.         parallelism: 2
    53.         delay: 10s
    54.       restart_policy:
    55.         condition: on-failure
    57.   worker:
    58.     image: dockersamples/examplevotingapp_worker
    59.     networks:
    60.       - frontend
    61.       - backend
    62.     depends_on:
    63.       - db
    64.       - redis
    65.     deploy:
    66.       mode: replicated
    67.       replicas: 1
    68.       labels: [APP=VOTING]
    69.       restart_policy:
    70.         condition: on-failure
    71.         delay: 10s
    72.         max_attempts: 3
    73.         window: 120s
    74.       placement:
    75.         constraints: [node.role == manager]
    77.   visualizer:    
    78.     image: dockersamples/visualizer:stable
    79.     ports:
    80.       - "8080:8080"
    81.     stop_grace_period: 1m30s
    82.     volumes:
    83.       - "/var/run/docker.sock:/var/run/docker.sock"
    84.     deploy:
    85.       placement:
    86.         constraints: [node.role == manager]
    88. networks:
    89.   frontend:
    90.   backend:
    92. volumes:
    93.   db-data: