Docker Network

it2025-04-10 21

1、创建 apline1 alpine 2 两个容器

docker run -it --name alpine1 -d alpine docker run -it --name alpine2 -d alpine

2、创建一个 mynet 网络

docker network create -d bridge --subnet 172.19.0.0/16 --gateway 172.19.0.1 mynet

3、把 alpine2 容器加入 mynet 网络

docker network connect mynet alpine2

4、创建 alpine3 容器并加入 mynet 网络

docker run -it --name alpine3 --network mynet --ip 172.19.2.1 -d alpine

5、查看容器

[root@ ~docker]# docker ps CONTAINER ID IMAGE COMMAND NAMES 96e6839315e7 alpine "/bin/sh" alpine3 264784076b5d alpine "/bin/sh" alpine2 28dfb21ea47b alpine "/bin/sh" alpine1

6、查看网络

[root@ ~docker]# docker network ls NETWORK ID NAME DRIVER SCOPE f494d9e871fc bridge bridge local 0049c2e52fe2 host host local 7a9f67575661 mynet bridge local d1e9a42f8a20 none null local

7、查看 mynet 网络明细

可以看到 apline 2，apline3 在 mynet 网络中

[root@~docker]# docker network inspect mynet [ { "Name": "mynet", "Id": "7a9f675756611910f059c8f9ab928bd76f3855fa1840794d9c1569f36cbbf913", "Created": "2020-10-21T21:10:02.09035415+08:00", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Driver": "default", "Options": {}, "Config": [ { "Subnet": "172.19.0.0/16" } ] }, "Internal": false, "Attachable": false, "Containers": { "264784076b5d5360cccff022e4ab7b4d5ad79c0562cce824f5291b00a290822b": { "Name": "alpine2", "EndpointID": "d20d282b72180a47e53d30737586c6601362129ec217eacadb96dffa37c83cb1", "MacAddress": "02:42:ac:13:00:02", "IPv4Address": "172.19.0.2/16", "IPv6Address": "" }, "96e6839315e7ea13b39afa483999ae7a6a8d9916eebebb416a5ceb1a93b26d08": { "Name": "alpine3", "EndpointID": "5c12559d5a6d9420400f76027bccce613316fa83e01c8744e98d4fa98d741c41", "MacAddress": "02:42:ac:13:02:01", "IPv4Address": "172.19.2.1/16", "IPv6Address": "" } }, "Options": {}, "Labels": {} } ]

8、查看 bridge 默认网络

可以看到 apline1，apline2 在 bridge 网络中

[root@ ~docker]# docker network inspect bridge [ { "Name": "bridge", "Id": "f494d9e871fc411c959e89ec8b4208c5763203a30e83eee8c5f1c9766be06e1a", "Created": "2020-10-20T09:11:29.030016967+08:00", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Driver": "default", "Options": null, "Config": [ { "Subnet": "172.17.0.0/16", "Gateway": "172.17.0.1" } ] }, "Internal": false, "Attachable": false, "Containers": { "264784076b5d5360cccff022e4ab7b4d5ad79c0562cce824f5291b00a290822b": { "Name": "alpine2", "EndpointID": "dde38b0fb5e2f9d77a21ba28b6f29a0a3e365694a9d40c3d339cbb569beb6b2d", "MacAddress": "02:42:ac:11:00:03", "IPv4Address": "172.17.0.3/16", "IPv6Address": "" }, "28dfb21ea47b8875a697ed5d4e8ade2e2e956c683cb32954185fe678593da93a": { "Name": "alpine1", "EndpointID": "2115e5adf7e50829932bcec4af8c1198474a7e40ca12e55c3cdeaf4a3dd9281a", "MacAddress": "02:42:ac:11:00:02", "IPv4Address": "172.17.0.2/16", "IPv6Address": "" } }, "Options": { "com.docker.network.bridge.default_bridge": "true", "com.docker.network.bridge.enable_icc": "true", "com.docker.network.bridge.enable_ip_masquerade": "true", "com.docker.network.bridge.host_binding_ipv4": "0.0.0.0", "com.docker.network.bridge.name": "docker0", "com.docker.network.driver.mtu": "1500" }, "Labels": {} } ]

9、登陆 alpine2

（1）查看 IP，看到有 2 个IP

/ # ifconfig eth0 Link encap:Ethernet HWaddr 02:42:AC:11:00:03 inet addr:172.17.0.3 Bcast:0.0.0.0 Mask:255.255.0.0 inet6 addr: fe80::42:acff:fe11:3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:25 errors:0 dropped:0 overruns:0 frame:0 TX packets:25 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2194 (2.1 KiB) TX bytes:1744 (1.7 KiB) eth1 Link encap:Ethernet HWaddr 02:42:AC:13:00:02 inet addr:172.19.0.2 Bcast:0.0.0.0 Mask:255.255.0.0 inet6 addr: fe80::42:acff:fe13:2/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:40 errors:0 dropped:0 overruns:0 frame:0 TX packets:23 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:3256 (3.1 KiB) TX bytes:1902 (1.8 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:36 errors:0 dropped:0 overruns:0 frame:0 TX packets:36 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2698 (2.6 KiB) TX bytes:2698 (2.6 KiB)

（2）测试

docker exec -it alpine2 /bin/sh # ping alpine3 容器，可以通 ping -w 3 alpine3 PING alpine3 (172.19.2.1): 56 data bytes 64 bytes from 172.19.2.1: seq=0 ttl=64 time=0.056 ms 64 bytes from 172.19.2.1: seq=1 ttl=64 time=0.060 ms 64 bytes from 172.19.2.1: seq=2 ttl=64 time=0.059 ms --- alpine3 ping statistics --- 4 packets transmitted, 3 packets received, 25% packet loss round-trip min/avg/max = 0.056/0.058/0.060 ms # ping alpine1 容器，默认网络不能使用容器名访问 ping -w 3 alpine1 ping: bad address 'alpine1' #　但是可以通过 IP 访问 / # ping -w3 172.17.0.2 PING 172.17.0.2 (172.17.0.2): 56 data bytes 64 bytes from 172.17.0.2: seq=0 ttl=64 time=0.090 ms 64 bytes from 172.17.0.2: seq=1 ttl=64 time=0.064 ms 64 bytes from 172.17.0.2: seq=2 ttl=64 time=0.086 ms --- 172.17.0.2 ping statistics --- 4 packets transmitted, 3 packets received, 25% packet loss round-trip min/avg/max = 0.064/0.080/0.090 ms

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