本文讲解不同网络下的容器可以通过加入同一个docker网络，来访问该docker网络下的容器，并且既可以通过容器ip也可以通过容器名连接，非常方便。
上篇讲到创建自定义网络，我创建了 mynet 网络，并指定了网关和子网地址。在上篇结尾呢，我抛出了一个问题：其它网络下的容器可以直接访问mynet网络下的容器吗？今天就让我们一块看下怎么实现容器互联。
其它网络下的容器加入mynet网络，实现一个容器两个ip地址
网络集群
- 先创建
test-network网络：
docker network create test-network
- 再运行
centos01容器并加入到test-network网络下
docker run -it -P --name centos01 --net test-network centos
centos01容器已经加入在test-network网络下了
centos01加入mynet网络
root@--- ~]# docker network connect mynet centos01
查看mynet网络
docker network ls
[root@--- ~]# docker network ls NETWORK ID NAME DRIVER SCOPE feafa30d4051 bridge bridge local e8bf4fced9e2 host host local 0096a971fd2c mynet bridge local # 自定义bridge网桥 6263db0933b9 none null local 799426d70aa2 test-network bridge local
docker network inspect 0096
[root@--- ~]# docker network inspect 0096
[
{
"Name": "mynet",
"Id": "0096a971fd2c66400e53cbae5e53eceedc2f90d5685917e9534640a3535c0ef1",
"Created": "2021-10-04T10:18:09.113847736+08:00",
# ... 省略代码展示
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "192.168.0.0/16",
"Gateway": "192.168.0.1"
}
]
},
# ... 省略代码展示
"Containers": {
"2fac920eebd505794c4a27ef4efdf531d32805e8663bded93a473bd28236bc27": {
"Name": "mynet-centos01",
"EndpointID": "3aff075...",
"MacAddress": "02:42:c0:a8:00:02",
"IPv4Address": "192.168.0.2/16",
"IPv6Address": ""
},
"3dceda051252b6970fe2156bac7710ba6489a97aac68c49b1c85a2f130d0556f": {
"Name": "mynet-tomcat01",
"EndpointID": "9f52b19...",
"MacAddress": "02:42:c0:a8:00:03",
"IPv4Address": "192.168.0.3/16",
"IPv6Address": ""
},
"cb1922b95b9316d129b54f3545fad9729092926e10a1d5517f8928db42706151": {
"Name": "centos01",
"EndpointID": "0ba2107...",
"MacAddress": "02:42:c0:a8:00:04",
"IPv4Address": "192.168.0.4/16", # 新加入的centos01容器
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]
查看centos01的容器信息
可以看到Networks下面存在mynet、test-network两个网络连接信息
一个容器两个ip地址
无关代码已省略展示
[root@--- ~]# docker inspect cb19
[
{
"Id": "cb1922b95b9316d129b54f3545fad9729092926e10a1d5517f8928db42706151",
"Created": "2021-10-03T13:39:00.942877668Z",
"Path": "/bin/bash",
"Args": [],
# ... 省略代码展示
"NetworkSettings": {
# ... 省略代码展示
"Networks": {
# 网络连接1 ： mynet
"mynet": {、
# ... 省略代码展示
"Gateway": "192.168.0.1",
"IPAddress": "192.168.0.4",
"MacAddress": "02:42:c0:a8:00:04",
},
# 网络连接2 ： test-network
"test-network": {
# ... 省略代码展示
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.3",
"MacAddress": "02:42:ac:12:00:03",
}
}
}
}
]
test-network网卡下的centos01访问mynet网卡下的mynet-centos01、mynet-tomcat01
容器ip和容器名都可以连接
进入centos01容器
[root@--- ~]# docker exec -it cb19 /bin/bash
mynet-tomcat01 容器的IP是: 192.168.0.3
ping mynet-tomcat01 容器的IP
[root@cb1922b95b93 /]# ping 192.168.0.3 PING 192.168.0.3 (192.168.0.3) 56(84) bytes of data. 64 bytes from 192.168.0.3: icmp_seq=1 ttl=64 time=0.186 ms ^C --- 192.168.0.3 ping statistics --- 7 packets transmitted, 7 received, 0% packet loss, time 6000ms rtt min/avg/max/mdev = 0.090/0.127/0.186/0.029 ms
直接ping 容器名 mynet-centos01 mynet-tomcat01
[root@cb1922b95b93 /]# ping mynet-centos01 PING mynet-centos01 (192.168.0.2) 56(84) bytes of data. 64 bytes from mynet-centos01.mynet (192.168.0.2): icmp_seq=1 ttl=64 time=0.105 ms ^C --- mynet-centos01 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2001ms rtt min/avg/max/mdev = 0.105/0.116/0.130/0.013 ms [root@cb1922b95b93 /]# ping mynet-tomcat01 PING mynet-tomcat01 (192.168.0.3) 56(84) bytes of data. 64 bytes from mynet-tomcat01.mynet (192.168.0.3): icmp_seq=1 ttl=64 time=0.085 ms ^C --- mynet-tomcat01 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 0.085/0.093/0.102/0.012 ms [root@cb1922b95b93 /]#
结论
其它网络下的容器可以通过加入docker网络，来访问该docker网络下的容器，并且既可以通过容器ip也可以通过容器名连接，非常方便。docker0十分强大
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