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Docker compose networks 详解Docker-compose networks 的例子

klvchen 人气:0

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

补充:

docker compose 多容器共用网络问题

前几天计划使用docker compose 编写一个多容器共用一个容器网络,结果总是报错,今天又试了一下才发现是端口绑定的问题造成的,端口只能绑定在产生网卡的容器上,绑定在其它窗口上就会报错,如下代码 mysql服务共用了nginx的网卡,在mysql里使用了port:3306时就会运行失败,将3306移到nginx上启动就成功了。

version: '3.3'
services:
nginx:
image: "lnp_php"
# container_name: "lnmp_nginx"
ports:
- "80:80"
- "443:443"
- "3306:3306"
expose:
- "3306"
volumes:
- /home/www/php:/home/www:rw
# depends_on:
# - mysql
# links:
# - mysql
mysql:
image: "mysql"
# container_name: "lnmp_mysql"
# ports:
# - "3306:3306"
# expose:
# - "3306"
volumes:
- /home/docker/conf/mysql_w:/etc/mysql:rw
environment:
- MYSQL_ROOT_PASSWORD=123456
depends_on:
- nginx
network_mode: "service:nginx"

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