多个docker容器如何共享网络

多个docker容器如何共享网络

一、创建共享网络

无论哪种方式，第一步都是创建一个共享网络，这里创建一个名为 local_public 的网络，可以自定义，执行后会输出一个网络的ID，代表创建成功，也可通过 docker network ls 来查看网络列表.

# 创建公共网络
docker network create local_public

二、docker-compose 启动容器共享网络

目录结构如下

$ tree docker-test
docker-test
├── nginx1
│   └── 1.yml
└── nginx2
    └── 2.yml

1.yml 文件如下

version: "3"
services:
  nginx:
    image:
      nginx:alpine
    container_name: nginx1
    networks:
      - local_public #着重看这里
networks:
  local_public:
    external: true #着重看这里 不加网桥名不前缀，必需提前手动创建这个网络 默认是false，会加前缀，自动创建

手动创建这个网络

docker network create local_pullic
docker network ls

2.yml 文件如下

version: "3"
services:
  nginx:
    image:
      nginx:alpine
    container_name: nginx2
    networks:
      - local_public
networks:
  local_public:
    external: true

分别启动两个容器

docker-compose -f nginx1/1.yml up -d
docker-compose -f nginx2/2.yml up -d

进入nginx1容器，尝试 ping 两个容器

docker exec -it nginx1 sh
/ # ping nginx1 -c 4
PING nginx1 (172.20.0.2): 56 data bytes
64 bytes from 172.20.0.2: seq=0 ttl=64 time=0.238 ms
64 bytes from 172.20.0.2: seq=1 ttl=64 time=0.196 ms
64 bytes from 172.20.0.2: seq=2 ttl=64 time=0.208 ms
64 bytes from 172.20.0.2: seq=3 ttl=64 time=0.268 ms
--- nginx1 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.196/0.227/0.268 ms

/ # ping nginx2 -c 4
PING nginx2 (172.20.0.3): 56 data bytes
64 bytes from 172.20.0.3: seq=0 ttl=64 time=0.394 ms
64 bytes from 172.20.0.3: seq=1 ttl=64 time=0.358 ms
64 bytes from 172.20.0.3: seq=2 ttl=64 time=0.365 ms
64 bytes from 172.20.0.3: seq=3 ttl=64 time=0.348 ms
--- nginx2 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 0.348/0.366/0.394 ms

可以 ping 通 nginx1 和 nginx2 两个容器的IP不同，进入nginx2也可以得到同样的结果

参考文档：

http://www.ibloger.net/article/3525.html