docker网络如何配置

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docker的网络

docker network

docker有3个默认网络

[root@srv00 ~]# docker network lsNETWORK ID          NAME                DRIVERb891bd36a3f1        bridge              bridge              739cb6a018f7        host                host                d0e062995920        none                null

默认容器都是运行在 bridge 网络下

运行个容器测试下

[root@srv00 ~]# docker run -itd --name nw centos5ffb7062805af03b00ecc6160a78c855a7d1b7c32bfcc14d78ce036f2df9a517[root@srv00 ~]# docker psCONTAINER ID        IMAGE               COMMAND                  CREATED              STATUS              PORTS                   NAMES5ffb7062805a        centos              "/bin/bash"              About a minute ago   Up About a minute                           nw

--name 给容器命名,否则docker自动命名.

查看bridge网络下的容器有哪些:

[root@srv00 ~]# docker network inspect bridge[    {        "Name": "bridge",        "Id": "b891bd36a3f12dc2bb1f4526c0fc2741c0f8ccf6011071116840b6b31f9b20ac",        "Scope": "local",        "Driver": "bridge",        "EnableIPv6": false,        "IPAM": {            "Driver": "default",            "Options": null,            "Config": [                {                    "Subnet": "172.17.0.0/16",                    "Gateway": "172.17.42.1"                }            ]        },        "Internal": false,        "Containers": {            "5ffb7062805af03b00ecc6160a78c855a7d1b7c32bfcc14d78ce036f2df9a517": {                "Name": "nw",                "EndpointID": "65f410576be2d9aadb697ebb820e372ffb2073db7868ec001e87da5c8cf40d71",                "MacAddress": "02:42:ac:11:00:02",                "IPv4Address": "172.17.0.2/16",                "IPv6Address": ""            },            "616d942216ee7050ecff07ca66d2d7583d4093820e9d1448f96b417d7d779408": {                "Name": "high_shockley",                "EndpointID": "de09ec8b400b2724238d78ece5ff24201b7baffcdb7279809ea6b1beae5fec1d",                "MacAddress": "02:42:ac:11:00:06",                "IPv4Address": "172.17.0.6/16",                "IPv6Address": ""            },            "dead20777b6c1609ab968966b3589904d44f8a12c124c178fd5cb540052cce6f": {                "Name": "gloomy_cray",                "EndpointID": "1ba62447dd2d89165fc7079442a2016fb1c44caa02cca7cda6bf363eec2841da",                "MacAddress": "02:42:ac:11:00:07",                "IPv4Address": "172.17.0.7/16",                "IPv6Address": ""            },            "e709f66c9bdbcc20f92b804e483bb566bc4ee934fa1e2e5cdbf4759f7ac1923c": {                "Name": "tiny_shockley",                "EndpointID": "a070387813fc17fd54ab389b4afe40c80c5dbbe42c86983a89a84a65cf32e378",                "MacAddress": "02:42:ac:11:00:01",                "IPv4Address": "172.17.0.1/16",                "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": {}    }]

可以看到刚运行的容器nw的ip是172.17.0.2

我们可以将某个容器从网络中移除

[root@srv00 ~]# docker exec -it high_shockley /bin/bash[root@616d942216ee /]# ping 172.17.0.2PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.64 bytes from 172.17.0.2: icmp_seq=1 ttl=64 time=0.100 ms64 bytes from 172.17.0.2: icmp_seq=2 ttl=64 time=0.065 ms^C--- 172.17.0.2 ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 999msrtt min/avg/max/mdev = 0.065/0.082/0.100/0.019 ms[root@616d942216ee /]# exitexit

先进入同网络的另一个容器ping,可以ping通.

[root@srv00 ~]# docker network disconnect bridge nw[root@srv00 ~]# docker exec -it high_shockley /bin/bash[root@616d942216ee /]# ping 172.17.0.2                                                                                                              PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.^C--- 172.17.0.2 ping statistics ---3 packets transmitted, 0 received, 100% packet loss, time 1999ms[root@616d942216ee /]# exitexit[root@srv00 ~]# docker network inspect bridge...

可以看到ping不通.也不在bridge网络里了.通过docker inspect nw 已经没有ip地址了.

创建自己的 bridge network

docker 支持 两个网络驱动类型'bridge'和overlay. 'bridge' 是运行在统一主机上的网络.overlay可以包括多个主机.

这里我们先创建自己的'bridge'网络

[root@srv00 ~]# docker network create -d bridge mynetwork072dbe030461bc1f7e1bc4829017f13ade899b09b606d12dfb8b6dec496a08bf[root@srv00 ~]# docker network lsNETWORK ID          NAME                DRIVERb891bd36a3f1        bridge              bridge              739cb6a018f7        host                host                072dbe030461        mynetwork           bridge              d0e062995920        none                null                [root@srv00 ~]# docker network inspect mynetwork[    {        "Name": "mynetwork",        "Id": "072dbe030461bc1f7e1bc4829017f13ade899b09b606d12dfb8b6dec496a08bf",        "Scope": "local",        "Driver": "bridge",        "EnableIPv6": false,        "IPAM": {            "Driver": "default",            "Options": {},            "Config": [                {                    "Subnet": "172.18.0.0/16",                    "Gateway": "172.18.0.1/16"                }            ]        },        "Internal": false,        "Containers": {},        "Options": {},        "Labels": {}    }]

mynetwork下一个容器都没有

运行个容器在mynetwork下

[root@srv00 ~]# docker run -itd --net mynetwork --name nw1 centosc5b59a1e180753301460b597b87b1608b00ebe2b8620b41b8851938c6eab8044[root@srv00 ~]# docker network inspect mynetwork[    {        "Name": "mynetwork",        "Id": "072dbe030461bc1f7e1bc4829017f13ade899b09b606d12dfb8b6dec496a08bf",        "Scope": "local",        "Driver": "bridge",        "EnableIPv6": false,        "IPAM": {            "Driver": "default",            "Options": {},            "Config": [                {                    "Subnet": "172.18.0.0/16",                    "Gateway": "172.18.0.1/16"                }            ]        },        "Internal": false,        "Containers": {            "c5b59a1e180753301460b597b87b1608b00ebe2b8620b41b8851938c6eab8044": {                "Name": "nw1",                "EndpointID": "ed444519fd958ddd83d64f62719f485f62d284f2a647536e4f48a8128e62ad5e",                "MacAddress": "02:42:ac:12:00:02",                "IPv4Address": "172.18.0.2/16",                "IPv6Address": ""            }        },        "Options": {},        "Labels": {}    }]

测试下互通性 先把nw连到bridge网络

[root@srv00 ~]# docker network connect bridge nw[root@srv00 ~]# docker exec -it nw /bin/bash [root@5ffb7062805a /]# ping 172.18.0.2    PING 172.18.0.2 (172.18.0.2) 56(84) bytes of data.^C--- 172.18.0.2 ping statistics ---3 packets transmitted, 0 received, 100% packet loss, time 1999ms

不同网络中的容器不通.

将nw也加入到mynetwork

[root@srv00 ~]# docker network connect mynetwork nw[root@srv00 ~]# docker network inspect mynetwork[root@srv00 ~]# docker network inspect bridge

可以看到2个网络中都有nw

[root@srv00 ~]# docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' nw172.17.0.2172.18.0.3[root@srv00 ~]# docker exec -it nw /bin/bash [root@5ffb7062805a /]# ping 172.18.0.2 -c3PING 172.18.0.2 (172.18.0.2) 56(84) bytes of data.64 bytes from 172.18.0.2: icmp_seq=1 ttl=64 time=0.093 ms64 bytes from 172.18.0.2: icmp_seq=2 ttl=64 time=0.057 ms64 bytes from 172.18.0.2: icmp_seq=3 ttl=64 time=0.076 ms--- 172.18.0.2 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2000msrtt min/avg/max/mdev = 0.057/0.075/0.093/0.016 ms[root@5ffb7062805a /]# ping 172.17.0.6 -c3PING 172.17.0.6 (172.17.0.6) 56(84) bytes of data.64 bytes from 172.17.0.6: icmp_seq=1 ttl=64 time=0.102 ms64 bytes from 172.17.0.6: icmp_seq=2 ttl=64 time=0.080 ms^C--- 172.17.0.6 ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 999msrtt min/avg/max/mdev = 0.080/0.091/0.102/0.011 ms

nw 这台容器有两个ip,同时在两个网段中,两个网络中的容器都可以互通.

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