[root@localhost ~]# docker exec tomcat01 ping tomcat-net-01

ping: tomcat-net-01: Name or service not known

# 测试打通 tomcat01 和mynet网络

# 连通之后就是将tomcat01 放到可 mynet 网络下

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

[root@localhost ~]# docker inspect mynet

# 相当于就是一个容器两个ip；比如就是阿里云服务，有一个公网ip，还有一个私网ip

# tomcat01 成功连接不同网段的 tomcat-net-01
[root@localhost ~]# docker exec -it tomcat01 ping tomcat-net-01

PING tomcat-net-01 (192.168.0.3) 56(84) bytes of data.

64 bytes from tomcat-net-01.mynet (192.168.0.3): icmp_seq=1 ttl=64 time=0.147 ms

64 bytes from tomcat-net-01.mynet (192.168.0.3): icmp_seq=2 ttl=64 time=0.062 ms

^Z64 bytes from tomcat-net-01.mynet (192.168.0.3): icmp_seq=3 ttl=64 time=0.063 ms

64 bytes from tomcat-net-01.mynet (192.168.0.3): icmp_seq=4 ttl=64 time=0.045 ms