使用Docker容器安装或更新Composer依赖包

直接看docker-compose.yml配置文件

此配置文件是在之前写过的一篇Docker安装配置Nginx、Mysql、PHP、Redis容器服务，的基础上扩展的。

version: '3'

networks:
  backend:
    driver: bridge

  # 定义四个服务nginx,php,mysql,redis
services:
  nginx:
    # 依赖php服务，意味着在启动nginx之前先启动php
    depends_on:
      - php-fpm
    # nginx镜像的路径
    image: registry.cn-shenzhen.aliyuncs.com/yxyong/nginx
    volumes:
      - ./website:/var/www:cached
      - ./logs/nginx:/var/log/nginx
      - ./conf/nginx/sites:/etc/nginx/sites-available
      - ./conf/nginx/ssl:/etc/nginx/ssl
    # nginx意外退出时自动重启
    restart: always
    # 映射80和443端口
    ports:
      - "80:80"
      - "443:443"
    # 容器名称
    container_name: nginx
    networks:
      - backend

  php-fpm:
    depends_on:
      - mysql
      - redis
    image: registry.cn-shenzhen.aliyuncs.com/yxyong/php
    restart: always
    volumes:
      #- ./conf/php/php.ini:/usr/local/etc/php/php.ini
      - ./website:/var/www:cached
    container_name: php-fpm
    networks:
      - backend
      
  mysql:
    image: registry.cn-shenzhen.aliyuncs.com/yxyong/mysql
    volumes:
      - ./conf/mysql/my.cnf:/etc/mysql/conf.d/my.cnf
      - ./data/mysql:/var/lib/mysql
    restart: always
    # 设置MYSQL_ROOT_PASSWORD环境变量，这里是设置mysql的root密码。这里为wanphp@1314。
    environment:
      MYSQL_ROOT_PASSWORD: wanphp@1314
      TZ: PRC
    ports:
      - "13306:3306"
    container_name: mysql
    networks:
      - backend

  redis:
    image: registry.cn-shenzhen.aliyuncs.com/yxyong/redis
    volumes:
    #  - ./conf/redis/redis.conf:/usr/local/etc/redis.conf
      - ./data/redis:/data
    restart: always
    ports:
      - "16379:6379"
    container_name: redis
    networks:
      - backend

  composer:
    image: composer:latest
    command: ["composer", "install" ] #update
    container_name: composer
    volumes:
      - ./website/itempath:/app

默认情况下，composer镜像会执行/app文件夹中的命令，所以我们将要intsall或update项目目录映射到composer容器内部的/app目录
当composer容器启动时，它执行“ composer install”命令，然后退出。
如果需要更新，将docker-compose.yml配置文件中的
command: ["composer", "install" ]
改成
command: ["composer", "update" ]
在docker-compose.yml配置文件目录中执行docker-compose up -d更新依赖包。
以后可以使用docker-compose restart composer或docker restart composer更新依赖包。
docker logs composer查看依赖包更新情况。
参与原文：https://hackernoon.com/get-composer-to-run-on-docker-container-a-how-to-guide-y86g36z7