编写规则

官方文档：https://docs.docker.com/compose/compose-file/compose-file-v3/

主要分为三层

# 第一层 版本，与docker版本对应，向下兼容。最新为3.9
version: '3.9'
# 第二层 服务
services: 
  # 服务一
  web：
    # 服务配置
    images：
    bulid：
    ports:
    network：
    ...
  redis:
    ...
  mysql：
    ...

# 第三层 其他配置，如：网络、数据卷、全局配置
networks:
  frontend:
  backend:
volumes:
  db-data:
configs：

官方实例

可根据上述三层，参考下官方例子

version: "3.9"
services:

  redis:
    image: redis:alpine
    ports:
      - "6379"
    networks:
      - frontend
    deploy:
      replicas: 2
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure

  db:
    image: postgres:9.4
    volumes:
      - db-data:/var/lib/postgresql/data
    networks:
      - backend
    deploy:
      placement:
        max_replicas_per_node: 1
        constraints:
          - "node.role==manager"

  vote:
    image: dockersamples/examplevotingapp_vote:before
    ports:
      - "5000:80"
    networks:
      - frontend
    depends_on:
      - redis
    deploy:
      replicas: 2
      update_config:
        parallelism: 2
      restart_policy:
        condition: on-failure

  result:
    image: dockersamples/examplevotingapp_result:before
    ports:
      - "5001:80"
    networks:
      - backend
    depends_on:
      - db
    deploy:
      replicas: 1
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure

  worker:
    image: dockersamples/examplevotingapp_worker
    networks:
      - frontend
      - backend
    deploy:
      mode: replicated
      replicas: 1
      labels: [APP=VOTING]
      restart_policy:
        condition: on-failure
        delay: 10s
        max_attempts: 3
        window: 120s
      placement:
        constraints:
          - "node.role==manager"

  visualizer:
    image: dockersamples/visualizer:stable
    ports:
      - "8080:8080"
    stop_grace_period: 1m30s
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints:
          - "node.role==manager"

networks:
  frontend:
  backend:

volumes:
  db-data:

实战案例

搭建一个WordPress博客。

官方文档：https://docs.docker.com/samples/wordpress/

创建文件夹

用来存放项目文件

mkdir -p /test/wordpress
cd /test/wordpress

docker-compose.yml

创建docker-compose.yml文件

vim docker-compose.yml

输入以下内容

version: "3.9"
    
services:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: somewordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    volumes:
      - wordpress_data:/var/www/html
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
      WORDPRESS_DB_NAME: wordpress
volumes:
  db_data: {}
  wordpress_data: {}

启动Docker Compose

# 前台启动
docker-compose up
# 后台启动
docker-compose up -d

前台启动，Ctrl+c就能停止

后台启动成功

访问

浏览器ip:8000，如我的192.168.227.3:8000

以上如有错误，麻烦大家评论指正