[转]Docker 两个不同网络间实现连通
原文地址:
Docker 两个不同网络间实现连通 - 西瓜君~ - 博客园
一、启动不同网络的容器
1、启动两个bridge（自带默认）桥接的容器
[root@yang ~]# docker run -it --name tomcat1 tomcat
[root@yang ~]# docker run -it --name tomcat2 tomcat
# 查看容器
[root@yang ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES fcdd4c02da9c tomcat "catalina.sh run" 2 days ago Up 2 days 8080/tcp tomcat2 346962a1d73b tomcat "catalina.sh run" 3 days ago Up 2 days 8080/tcp tomcat1
2.启动两个mynet（自定义）桥接的容器
[root@yang ~]# docker run -it --name tomcat-net-01 --net mynet tomcat
[root@yang ~]# docker run -it --name tomcat-net-02 --net mynet tomcat
# 查看容器
[root@yang ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 8685e41a5962 tomcat "catalina.sh run" 2 days ago Up 2 days 8080/tcp tomcat-net-02 25e1b7c89af4 tomcat "catalina.sh run" 2 days ago Up 2 days 8080/tcp tomcat-net-01
二、目前两个容器连通性
示例图：
测试：
[root@yang ~]# docker exec -it tomcat01 ping tomcat-net-01
ping: tomcat-net-01: Temporary failure in name resolution
以上，明显提示ping不通，直接报错，因为这本来就是不可能连通的！
三、两个不同网络，容器间互通
1.查看操作语法
[root@yang ~]# docker network connect --help Usage: docker network connect [OPTIONS] NETWORK CONTAINER
Connect a container to a network
Options:
--alias strings Add network-scoped alias for the container
--driver-opt strings driver options for the network
--ip string IPv4 address (e.g., 172.30.100.104)
--ip6 string IPv6 address (e.g., 2001:db8::33)
--link list Add link to another container
--link-local-ip strings Add a link-local address for the container
2.实际操作指令
[root@yang ~]# docker network connect mynet tomcat1
3.测试两者间是否互通
# tomcat1 ping tomcat-net-01可以ping通！
[root@yang ~]# docker exec -it tomcat1 ping tomcat-net-01 PING tomcat-net-01 (192.168.0.2) 56(84) bytes of data. 64 bytes from tomcat-net-01.mynet (192.168.0.2): icmp_seq=1 ttl=64 time=0.209 ms 64 bytes from tomcat-net-01.mynet (192.168.0.2): icmp_seq=2 ttl=64 time=0.108 ms
# tomcat1 ping tomcat-net-02 也可以ping通！
[root@yang ~]# docker exec -it tomcat1 ping tomcat-net-02 PING tomcat-net-02 (192.168.0.3) 56(84) bytes of data. 64 bytes from tomcat-net-02.mynet (192.168.0.3): icmp_seq=1 ttl=64 time=0.184 ms 64 bytes from tomcat-net-02.mynet (192.168.0.3): icmp_seq=2 ttl=64 time=0.275 ms
# tomcat2 ping tomcat-net-02 ping不通（因为没有开通tomcat2到mynet网桥中）！
[root@yang ~]# docker exec -it tomcat2 ping tomcat-net-02 ping: tomcat-net-02: Temporary failure in name resolution
4.查看mynet内发生变化
[root@yang ~]# docker network inspect mynet
[
{
"Name": "mynet",
"Id": "68bb4c7c3f1c6808ab2ce49a966e11440f560b89080b6a20f9c9b715d690519b",
"Created": "2021-01-29T16:10:07.565642609+08:00",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "192.168.0.0/16",
"Gateway": "192.168.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"25e1b7c89af4744e9a7df48373886dc8f906c2e35dca2e644bf8deb81a6853db": {
"Name": "tomcat-net-01",
"EndpointID": "3e2a2d4e4807c4c7058f248720e653ffdb094238a6c34df403d501cf68fa559b",
"MacAddress": "02:42:c0:a8:00:02",
"IPv4Address": "192.168.0.2/16",
"IPv6Address": ""
},
"346962a1d73badd263d10d76578ece0e6c2b33e1db08b264fb1fc66affd4a34a": {
"Name": "tomcat1",
"EndpointID": "d6eb17193d981338f7a1a178ace1751c9b8a6623a389072f71142deb41bddfb5",
"MacAddress": "02:42:c0:a8:00:04",
"IPv4Address": "192.168.0.4/16",
"IPv6Address": ""
},
"8685e41a59628a81c69752f9785065f5985c2165ef9ee33edc5acec1d801fa51": {
"Name": "tomcat-net-02",
"EndpointID": "08e234cf42025805acc2bd7ae6a2dee602090e5f1f5e66ef5b7753e5654f348d",
"MacAddress": "02:42:c0:a8:00:03",
"IPv4Address": "192.168.0.3/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]
以上，显示mynet网桥中多出来一个tomcat1。
结论：
假如要跨网络操作别人，就需要用docker network connect 来实现连通！
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