Docker 网络

Docker提供了Docker内部的网络功能,容器与容器,容器与宿主机之间可以组建网络通信。如果在宿主机上执行ifconfig,可看到Docker网卡配置信息,这个是在主机上安装Docker时创建的。

[root@qikegu /]# ifconfig
...
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:49ff:fe2a:8f69  prefixlen 64  scopeid 0x20<link>
        ether 02:42:49:2a:8f:69  txqueuelen 0  (Ethernet)
        RX packets 13643  bytes 556006 (542.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 25918  bytes 34465275 (32.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
...

Docker网卡是Docker容器和Linux主机之间的桥梁。现在让我们看看Docker中与网络相关的一些命令。

列出所有Docker网络

使用以下命令可以列出Docker的全部网络:

docker network ls 

示例


[root@qikegu /]# docker network ls NETWORK ID NAME DRIVER SCOPE a01805a42152 bridge bridge local 60f77bd6d128 deploly_default bridge local 257076d69def host host local 8643edd58814 none null local

检查Docker网络

如果想查看Docker网络的更多细节,可以使用以下命令:

docker network inspect networkname/networkID

示例

[root@qikegu /]# docker network inspect bridge
[
    {
        "Name": "bridge",
        "Id": "a01805a42152776b39aac8a89a4d06a4c3996a1721ccf1a62415e26dc2a2adaf",
        "Created": "2019-05-21T10:56:35.367205598+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,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {},
        "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": {}
    }
]

现在让我们运行一个容器,然后再次查看bridge网络详情,看看会发生什么。

让我们用下面的命令启动一个Ubuntu容器

[root@qikegu ~]# docker run -it --rm ubuntu /bin/bash
root@f724b706913b:/#

现在,通过下面的命令查看bridge网络详情,可以看到容器加入了bridge网络。

[root@qikegu /]# docker network inspect bridge
[
    {
        ...

        "Containers": {
            "f724b706913b30f77d024be9a0c5c19ece87ca806dc4237480243ea90213a149": {
                "Name": "modest_elbakyan",
                "EndpointID": "457288f3d811802c91ef769ff3c6aa1b8a86cf11d5bd3db2313593cfb93e67a8",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            }
        },

        ...
    }
]

容器启动时,如果没有指定网络,默认会加入bridge网络。

创建自己的网络

可以在启动容器之前,在Docker中创建一个网络:

docker network create --driver drivername name 
  • drivername – 网络驱动程序的名称
  • name – 网络的名称

该命令将输出新网络的长ID。

示例

创建网络:

[root@qikegu /]# docker network create --driver bridge my_network
f8e40a0a5cb547bed363b3fee5eb53bb8730e1b9404f9687a5a6c0674f1b70d7

现在,您可以在启动容器时加入新的网络。让我们用下面的命令启动一个Ubuntu容器

[root@qikegu ~]# docker run -it --network=my_network --rm ubuntu /bin/bash
root@a4735bf2379e:/#

现在,当您通过以下命令查看my_network网络详情时,可以看到ubuntu容器加入了网络(名字:relaxed_feynman)。

[root@qikegu /]# docker network inspect my_network
[
    {
        "Name": "my_network",
        "Id": "f8e40a0a5cb547bed363b3fee5eb53bb8730e1b9404f9687a5a6c0674f1b70d7",
        "Created": "2019-05-21T20:26:27.129007295+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.20.0.0/16",
                    "Gateway": "172.20.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "a4735bf2379e2e0b6c0083c3e438c876204f53abbbce49de2672eddc2400cb98": {
                "Name": "relaxed_feynman",
                "EndpointID": "2bb5e011bea7a42aea61272e23cd993c1408b5ce95f030639c7159a52f13063f",
                "MacAddress": "02:42:ac:14:00:02",
                "IPv4Address": "172.20.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]
[root@qikegu /]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
a4735bf2379e        ubuntu              "/bin/bash"         5 minutes ago       Up 5 minutes                            relaxed_feynman

可以看到ubuntu容器已经加入到my_network网络了。



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