docker容器抛出错误：php_network_getaddresses：getaddrinfo失败：名称或服务未知

请检查我的docker-compose文件：

version: '2' services: db: image: mysql:latest networks: app_net: ipv4_address: 172.16.238.10 ipv6_address: 2001:3984:3989::10 volumes: - "./data/db:/var/lib/mysql" restart: always environment: MYSQL_ROOT_PASSWORD: wordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress wordpress: image: wordpress links: - db ports: - "8000:80" environment: - WORDPRESS_DB_PASSWORD=wordpress networks: app_net: ipv4_address: 172.16.238.12 ipv6_address: 2001:3984:3989::10 volumes: - ./code:/code - ./html:/var/www/html networks: app_net: driver: bridge driver_opts: com.docker.network.enable_ipv6: "true" ipam: driver: default config: - subnet: 172.16.238.0/24 gateway: 172.16.238.1 - subnet: 2001:3984:3989::/64 gateway: 2001:3984:3989::1 

现在两个容器正在运行：

两个容器的IP地址都已正确configuration。 但是当我连接到http://172.16.238.12:8000/（172.16.238.12 – 是WordPress的IP地址）。 它说，“无法连接”。

当我检查docker_wordpress_1的日志文件时，它显示了我：

 Warning: mysqli::mysqli(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 10 MySQL Connection Error: (2002) php_network_getaddresses: getaddrinfo failed: Name or service not known 

我不明白哪里出了问题。

Answer 1

我看到你的'db'部分没有任何端口映射。 （具有相同的networkingconfiguration）。
我正在使用下面的DB部分，并可以build立一个连接：

 db: build: context: . dockerfile: ./compose/mysql/Dockerfile volumes: - mysql_data_dev:/var/lib/mysql restart: always ports: - "3306:3306" container_name: typewriter_db networks: app_net: ipv4_address: 172.16.238.10 ipv6_address: 2001:3984:3989::10