三、网络连通

 docker network connect  连接一个容器到一个网络（非常重要）

[root@docker ~]# docker network connect --help

测试打通Tomcat01 - mynet

[root@docker ~]# docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

fd1b6cc0d0be        centos              "/bin/bash"         14 minutes ago      Up 14 minutes                           tomcat02

7b17fe3730b7        centos              "/bin/bash"         14 minutes ago      Up 14 minutes                           tomcat01

6dcaf8d16982        centos              "/bin/bash"         24 minutes ago      Up 24 minutes                           cenos02

0f928c84f9f4        centos              "/bin/bash"         24 minutes ago      Up 24 minutes                           cenos01

[root@docker ~]# docker network connect mynet tomcat01

#连通之后就是将Tomcat01与mynet打通，放到了mynet网络下。

就是一个容器两个ip

[root@docker ~]# docker exec -it tomcat01 ping cenos01

PING cenos01 (192.168.1.2) 56(84) bytes of data.

64 bytes from cenos01.mynet (192.168.1.2): icmp_seq=1 ttl=64 time=0.046 ms

64 bytes from cenos01.mynet (192.168.1.2): icmp_seq=2 ttl=64 time=0.043 ms

结论：假设我们要跨网络操作，就需要docker network connect 来连通