Docker-compose networks 的例子

今天实验了下 docker 下的网络设置，记录一下过程，以免后面忘记。
(系统：Centos 7.4 ，docker 版本：18.03.1-ce， docker-compose version 1.18.0)

cat docker-compose.yml 
version: '3'
services: 
  test1:
    image: busybox:latest         # 镜像为 busybox
    entrypoint:                   # 容器启动后执行 top 命令，使容器没法立即退出
     - top
    networks:
      backend:          # 使用指定的网络 backend, 并且设置网络别名为 test1，
        aliases:        # 设置网络别名后，可以在其他容器中 ping test1 访问到该容器
          - test1

  test2:
    image: busybox:latest
    entrypoint:
     - top
    networks:
      backend:
        aliases:
          - test2

networks:
  backend:

启动

docker-compose up -d

docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
4d05ceb2088d        busybox:latest      "top"               5 seconds ago       Up 4 seconds                            ibaboss_test2_1
f4ccafa24664        busybox:latest      "top"               5 seconds ago       Up 4 seconds                            ibaboss_test1_1

docker exec -it 4d05ceb2088d /bin/sh
/ # ping test1
PING test1 (172.19.0.2): 56 data bytes
64 bytes from 172.19.0.2: seq=0 ttl=64 time=0.061 ms
64 bytes from 172.19.0.2: seq=1 ttl=64 time=0.062 ms

ping ibaboss_test1_1
PING ibaboss_test1_1 (172.19.0.2): 56 data bytes
64 bytes from 172.19.0.2: seq=0 ttl=64 time=0.045 ms
64 bytes from 172.19.0.2: seq=1 ttl=64 time=0.056 ms
64 bytes from 172.19.0.2: seq=2 ttl=64 time=0.061 ms

# 在网络中可以通过 容器名字或者网络的别名 进行通信

---

Compose 的容器名称格式是：<项目名称><服务名称><序号>
虽然可以自定义项目名称、服务名称，但是如果你想完全控制容器的命名，可以使用这个标签指定：
container_name: app

cat docker-compose_v1.yml 
version: '3'
services: 
  test1:
    image: busybox:latest
    entrypoint:
     - top
    container_name: test1
    networks:
     - backend

  test2:
    image: busybox:latest
    entrypoint:
     - top
    container_name: test2
    networks:
     - backend

networks:
  backend:

启动

docker-compose -f docker-compose_v1.yml up -d

docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS              PORTS               NAMES
132859fc77c2        busybox:latest      "top"               About a minute ago   Up About a minute                       test2
cd0a78dc9bd4        busybox:latest      "top"               About a minute ago   Up About a minute                       test1

docker exec -it 132859fc77c2 ping test1
PING test1 (172.19.0.2): 56 data bytes
64 bytes from 172.19.0.2: seq=0 ttl=64 time=0.070 ms
64 bytes from 172.19.0.2: seq=1 ttl=64 time=0.068 ms
64 bytes from 172.19.0.2: seq=2 ttl=64 time=0.059 ms