docker compose pull phpmyadmin

前面我们已经搭建好了php+mysql+nginx环境， 我们日常管理mysql一般是使用navicate for mysql 或phpmyadmin，显然这里是不能用navicate for mysql 了，phpmyadmin在docker也是有镜像的，我们也只需要按照以前的做法把phpmyadmin加入docker-compose.yml;这里首先说下我遇到的问题，刚开始我这样写的：

phpmyadmin:    image: phpmyadmin/phpmyadmin    restart: always    ports:      - "8181:80"    environment:      MYSQL_USER: root      MYSQL_PASSWORD: 123456      MYSQL_ROOT_PASSWORD: 123456    networks:      - code-network

然而提示错误说： unknown host ‘db'， 看错误就知道传入了错误的host，应该是docker默认的host吧，但根据前面的mysql的environment，没有MYSQL_HOST，我就查看phpmyadmin，https://hub.docker.com/r/phpmyadmin/phpmyadmin/，有这样几个environment：

• PMA_ARBITRARY - when set to 1 connection to the arbitrary server will be allowed
• PMA_HOST - define address/host name of the MySQL server
• PMA_VERBOSE - define verbose name of the MySQL server
• PMA_PORT - define port of the MySQL server
• PMA_HOSTS - define comma separated list of address/host names of the MySQL servers
• PMA_VERBOSES - define comma separated list of verbose names of the MySQL servers
• PMA_USER and PMA_PASSWORD - define username to use for config authentication method
• PMA_ABSOLUTE_URI - define user-facing URI

其中有一个是PAM_HOST，然后我加入这个环境变量，并赋值为localhost， 结果提示unknown host ‘localhost'，然后就bing，bing，bing，终于找到说需要传入mysql image的 image 名称， 所以根据前面的配置，我们需要传入mysql，所以完整的docker-compose.yml是这样的：

version: "2"services:  web:    image: nginx    ports:      - "8080:80"    volumes:      - ./code:/code      - ./site.conf:/etc/nginx/conf.d/default.conf    networks:      - code-network  mysql:    image: mysql    volumes:      - ./dbdata:/var/lib/mysql    ports:      - "3306:3306"    environment:      MYSQL_USER: root      MYSQL_PASSWORD: 123456      MYSQL_ROOT_PASSWORD: 123456    networks:      - code-network  php:    build: ./docker/php/    volumes:      - ./code:/code    networks:      - code-network  phpmyadmin:    image: phpmyadmin/phpmyadmin    restart: always    ports:      - "8181:80"    environment:      MYSQL_USER: root      MYSQL_PASSWORD: 123456      MYSQL_ROOT_PASSWORD: 123456      PMA_HOST: mysql    networks:      - code-networknetworks:  code-network:    driver: bridge