Docker自定义网络详解

目录了解 docker networkdocker network –helpdocker network create –help创建网络创建 mynet 网络查看网卡查看网络查看 mynet 网络详细信息启动容器，并加入mynet网络启动 mynet-centos01 , mynet-tomcat01 并加入mynet网络查看mynet网桥信息进入 mynet-centos01 测试连接 mynet-tomcat01结论思考问题：

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 networks 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