docker-compose links及external_li

links

version: "3.4"
services:
  redis-web:
    image: redis-web:1.0
    container_name: redis-web
    restart: always
    environment:
      REDIS_HOST: redis
    ports:
      - 8001:8001
    # 链接到其它容器，并启别名redis
    links:
      - redis-app:redis
  redis-app:
    image: redis:latest
    container_name: redis-app
    restart: always

进入容器，发现可以成功ping通redis

[root@vm02 test]# docker exec -it 31e0f35a1f77 bash
root@31e0f35a1f77:/# ping redis
PING redis (172.19.0.2) 56(84) bytes of data.
64 bytes from redis-app.test_default (172.19.0.2): icmp_seq=1 ttl=64 time=0.060 ms
64 bytes from redis-app.test_default (172.19.0.2): icmp_seq=2 ttl=64 time=0.060 ms
64 bytes from redis-app.test_default (172.19.0.2): icmp_seq=3 ttl=64 time=0.145 ms
64 bytes from redis-app.test_default (172.19.0.2): icmp_seq=4 ttl=64 time=0.054 ms

external_links

用于链接到外部容器。所有容器需要在同一个网络中。

1. 首先，自定义一个网络net-a

docker network create net-a --driver bridge

2. 创建外部容器

docker run --name redis-external --net net-a -d redis

3. 部署docker-compose，使用外部网络net-a

version: "3.4"
services:

  redis-web:
    image: redis-web:1.0
    container_name: redis-web
    restart: always
    environment: 
      REDIS_HOST: redis
    ports:
      - 8001:8001
    links:
      - redis-app:redis
  redis-web-external:
    image: redis-web:1.0
    container_name: redis-web-external
    restart: always
    environment:
      REDIS_HOST: redis-external
    ports:
      - 8002:8001
    external_links:
      - redis-external
  redis-app:
    image: redis:latest
    container_name: redis-app
    restart: always
networks:
  default:
    external:
      name: net-a

web容器内部已经可以ping通外部容器了。

[root@vm02 network-test]# docker exec -it 3ca6747e0ff7 ping redis-external
PING redis-external (172.24.0.7) 56(84) bytes of data.
64 bytes from redis-external.net-a (172.24.0.7): icmp_seq=1 ttl=64 time=0.091 ms
64 bytes from redis-external.net-a (172.24.0.7): icmp_seq=2 ttl=64 time=0.122 ms
64 bytes from redis-external.net-a (172.24.0.7): icmp_seq=3 ttl=64 time=0.185 ms