了解 docker network
通过下面的命令来获取帮助
- docker network --help
Commands:
connect Connect a container to a network
create Create a network
disconnect Disconnect a container from a network
inspect Display detailed information on one or more networks
ls List networks
prune Remove all unused networks
rm Remove one or more networks
- docker network create --help
Options:
--attachable Enable manual container attachment
--aux-address map Auxiliary IPv4 or IPv6 addresses used by Network driver (default map[])
--config-from string The network from which to copy the configuration
--config-only Create a configuration only network
-d, --driver string Driver to manage the Network (default "bridge")
--gateway strings IPv4 or IPv6 Gateway for the master subnet # 网关
--ingress Create swarm routing-mesh network
--internal Restrict external access to the network
--ip-range strings Allocate container ip from a sub-range
--ipam-driver string IP Address Management Driver (default "default")
--ipam-opt map Set IPAM driver specific options (default map[])
--ipv6 Enable IPv6 networking
--label list Set metadata on a network
-o, --opt map Set driver specific options (default map[])
--scope string Control the network's scope
--subnet strings Subnet in CIDR format that represents a network segment #子网
创建网络
- --driver bridge 网络类型，默认bridge网桥
- --subnet 192.168.0.0/16 子网
- --gateway 192.168.0.1 网关
创建 mynet 网络
docker network create --driver bridge --subnet 192.168.0.0/16 --gateway 192.168.0.1 mynet
0096a971fd2c66400e53cbae5e53eceedc2f90d5685917e9534640a3535c0ef1
查看网卡
[root@--- ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:16:3e:0a:00:34 brd ff:ff:ff:ff:ff:ff
inet 172.31.81.32/20 brd 172.31.95.255 scope global dynamic eth0
valid_lft 291870572sec preferred_lft 291870572sec
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:a4:2f:c5:62 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
140: br-799426d70aa2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:7f:01:1d:00 brd ff:ff:ff:ff:ff:ff
inet 172.18.0.1/16 brd 172.18.255.255 scope global br-799426d70aa2 # test-network
valid_lft forever preferred_lft forever
176: br-0096a971fd2c: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:d9:14:c1:d3 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.1/16 brd 192.168.255.255 scope global br-0096a971fd2c # mynet
valid_lft forever preferred_lft forever
查看网络
[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
查看 mynet 网络详细信息
[root@--- ~]# docker network inspect 0096a971fd2c
[
{
"Name": "mynet",
"Id": "0096a971fd2c66400e53cbae5e53eceedc2f90d5685917e9534640a3535c0ef1",
"Created": "2021-10-04T10:18:09.113847736+08:00",
"Scope": "local",
"Driver": "bridge", # mynet 网络类型
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "192.168.0.0/16", # mynet 子网
"Gateway": "192.168.0.1" # mynet 网关
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {},
"Options": {},
"Labels": {}
}
]
启动容器，并加入mynet网络
启动 mynet-centos01 , mynet-tomcat01 并加入mynet网络
[root@--- ~]# docker run -it -P --name mynet-tomcat01 --net mynet tomcat
[root@--- ~]# docker run -it -P --name mynet-centos01 --net mynet centos
查看mynet网桥信息
[root@--- ~]# docker network inspect 0096
[
{
"Name": "mynet",
"Id": "0096a971fd2c66400e53cbae5e53eceedc2f90d5685917e9534640a3535c0ef1",
"Created": "2021-10-04T10:18:09.113847736+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": {
"2fac920eebd505794c4a27ef4efdf531d32805e8663bded93a473bd28236bc27": {
"Name": "mynet-centos01",
"EndpointID": "3aff0752e641651a446ec490faa000812417855739086b2edb584ac2a95a26dd",
"MacAddress": "02:42:c0:a8:00:02",
"IPv4Address": "192.168.0.2/16",
"IPv6Address": ""
},
"3dceda051252b6970fe2156bac7710ba6489a97aac68c49b1c85a2f130d0556f": {
"Name": "mynet-tomcat01",
"EndpointID": "9f52b19493d35c48fe9b33a319de5dbe54c50de1a5d049103cb4e39bfe645f1b",
"MacAddress": "02:42:c0:a8:00:03",
"IPv4Address": "192.168.0.3/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]
进入 mynet-centos01 测试连接 mynet-tomcat01
# 发现通过容器ip和容器名都可以连接
[root@--- ~]# docker exec -it 2fac920eebd5 /bin/sh
sh-4.4# ping
sh-4.4# ping 192.168.0.3 # 通过容器ip连接
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=0.140 ms
64 bytes from 192.168.0.3: icmp_seq=2 ttl=64 time=0.110 ms
^C
--- 192.168.0.3 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
rtt min/avg/max/mdev = 0.110/0.121/0.140/0.016 ms
sh-4.4# ping mynet-tomcat01 # 通过容器名连接
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=0.078 ms
64 bytes from mynet-tomcat01.mynet (192.168.0.3): icmp_seq=2 ttl=64 time=0.131 ms
^C
--- mynet-tomcat01 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 0.078/0.110/0.131/0.026 ms
sh-4.4#
结论
在同一网络下的容器，发现通过容器ip和容器名都可以连接
思考问题：
其它网络下的容器可以直接访问mynet网络下的容器吗？
答案：不可以
解决方法： 让别的网络下的容器加入到
mynet网络下
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。
