Docker | 容器互联互通

本篇收录至Docker专栏,持续更新,欢迎访问😊

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

  1. 先创建test-network网络:
  • docker network create test-network
  1. 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

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root@--- ~]# docker network connect mynet centos01

查看mynet网络

  • docker network ls
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[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
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[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mynettest-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

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[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

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[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

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[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

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[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


我是 甜点cc

热爱前端,也喜欢专研各种跟本职工作关系不大的技术,技术、产品兴趣广泛且浓厚,等待着一个创业机会。本号主要致力于分享个人经验总结,希望可以给一小部分人一些微小帮助。

希望能和大家一起努力营造一个良好的学习氛围,为了个人和家庭、为了我国的互联网物联网技术、数字化转型、数字经济发展做一点点贡献。数风流人物还看中国、看今朝、看你我。