由于默认的bridge桥接网络，重启容器后会改变ip地址。在一些场景下我们希望固定容器ip地址。
dockerpose是docker的一个编排工具，相对于命令模式创建网络，容器等。使用配置文件相对来说更方便，可追溯问题。

直接粘贴dockerpose.yml文件

version: '2'
services:
  nginx:
   image: nginx:1.13.12
   container_name: nginx
   restart: always
   tty: true
   networks:
     extnetwork:
      ipv4_address: 172.19.0.2
 
networks:
  extnetwork:
   ipam:
     config:
     - subnet: 172.19.0.0/16
      gateway: 172.19.0.1

说明：

• gateway是网关地址

• subnet是网络号段

• extnetwork是自定义的网络名称

上面配置中我们的nginx容器固定ip为172.19.0.2

示例，自定义网络模式：

version: '2'
services:
  nginx:
   image: nginx:1.13.12
   container_name: nginx
   restart: always
   networks:
     extnetwork:
   ports:
     - 80:80
   volumes:
     - '/nginx/conf.d:/etc/nginx/conf.d'
  nginx2:
   image: nginx:1.13.12
   container_name: nginx2
   restart: always
   networks:
     extnetwork:
      ipv4_address: 172.19.0.2
     
  db:
   image: mysql:5.7
   container_name: db
   volumes:
    - /var/lib/mysql:/var/lib/mysql
   restart: always
   networks:
     extnetwork:
   ports:
     - 3306:3306
   environment:
    mysql_root_password: wordpress
    mysql_database: wordpress
    mysql_user: wordpress
    mysql_password: wordpress   
  
  wordpress:
   image: wordpress:latest
   container_name: wordpress
   depends_on:
     - db
   ports:
     - "8000:80"
   restart: always
   networks:
     extnetwork:
   environment:
     wordpress_db_host: db:3306
     wordpress_db_name: wordpress
     wordpress_db_user: wordpress
     wordpress_db_password: wordpress
networks:
  extnetwork:
   ipam:
     config:
     - subnet: 172.19.0.0/16
      gateway: 172.19.0.1