Docker | 容器互联互通

技术分享 3年前 (2022-10-19) 0 999+

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 /]#