在本地创建了global-container-network，用于不同容器之间的通讯

    1. $ docker network create global-container-network

    在需要互相通讯的容器中，连接到 global-container-network 即可，如 nacos 连接到 msyql8

    nacos 的 docker-compose.yml

    1. version: "3"
    3. networks:
    4.   global-container-network:
    5.     external: true
    7. services:
    8.   nacos:
    9.     container_name: nacos-standalone-mysql
    10.     image: nacos/nacos-server
    11.     ports:
    12.       - "8848:8848"
    13.       - "9848:9848"
    14.       - "9555:9555"
    15.     env_file:
    16.       - ./env/nacos-standlone-mysql.env
    17.     volumes:
    18.       - ./logs:/home/nacos/logs
    19.       - ./config/custom.properties:/home/nacos/init.d/custom.properties
    20.     networks:
    21.       - global-container-network

    mysql8 的 docker-compose.yml 文件

    1. version: "3"
    3. networks:
    4.   global-container-network:
    5.     external: true
    7. services:
    8.   mysql:
    9.     container_name: mysql8
    10.     image: mysql/mysql-server:8.0.18-1.1.13
    11.     command: --default-authentication-plugin=mysql_native_password
    12.     ports:
    13.       - 3306:3306
    14.       - 33060:33060
    15.     environment:
    16.       MYSQL_ROOT_PASSWORD: 123456
    17.       MYSQL_USER: hxy
    18.       MYSQL_PASSWORD: hxy
    19.     volumes:
    20.       - ./conf:/etc/mysql/conf.d
    21.       - ./data:/var/lib/mysql
    22.     networks:
    23.       - global-container-network

    如果连接的是外部网络，需要在 docker-compose.yml 中指定 network 为 外部网络

    1. networks:
    2.   global-container-network:
    3.     external: true

    先启动 mysql8，然后启动 nacos

    1. $ cd ~/docker/mysql8 // 进入 mysql8 目录
    2. $ docker-compose up -d
    4. $ cd ~/docker/nacos // 进入 nacos 目录
    5. $ docker-compose up -d

    进入 nacos 容器，尝试 ping mysql8

    1. $ docker exec -it nacos-standalone-mysql /bin/bash
    2. [root@2411284fab6a nacos]# ping mysql8
    3. PING mysql8 (172.26.0.2) 56(84) bytes of data.
    4. 64 bytes from mysql8.global-container-network (172.26.0.2): icmp_seq=1 ttl=64 time=0.066 ms
    5. 64 bytes from mysql8.global-container-network (172.26.0.2): icmp_seq=2 ttl=64 time=0.123 ms
    6. 64 bytes from mysql8.global-container-network (172.26.0.2): icmp_seq=3 ttl=64 time=0.197 ms

    可以 ping 到 mysql8 网络，证明容器之间可以正常进行通信

    参考：