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Docker网络Network

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这个实验一定要在Linux环境下做，docker for mac, docker for win是不行的。

docker网络类型

docker会给我们创建三种网络类型：bridge, host, none

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docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
a1681b4a3bc9        bridge              bridge              local
d724eb42948a        host                host                local
c9381cce7bbb        none                null                local

在没有指定相关网络的情况下，默认情况，会使用bridge网络模式。

网络验证

启动两个busybox容器。

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docker run -dit --name busybox1 busybox
4f3c61775b5e8bcd38a0c97ff97bcd16ed717ab31bea417b198192f83b493846

docker run -dit --name busybox2 busybox
c523392d8949b53abfbe736c43d2d47ea60a3420e8931bebc69d05baff93889b

查看一下bridge网络

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docker network inspect bridge
[
    {
        "Name": "bridge",
        "Id": "a1681b4a3bc9bf973e2ff712677e373b663cc65b3a9dd6e868f5635fff295a6a",
        "Created": "2020-02-05T16:24:09.290786154+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": {
            "4f3c61775b5e8bcd38a0c97ff97bcd16ed717ab31bea417b198192f83b493846": {
                "Name": "busybox1",
                "EndpointID": "bb138601e4d4018e8f36b4679cc22823fca3020d53fb7c372e47d1c73345b374",
                "MacAddress": "02:42:ac:11:00:02",
                "IPv4Address": "172.17.0.2/16",
                "IPv6Address": ""
            },
            "c523392d8949b53abfbe736c43d2d47ea60a3420e8931bebc69d05baff93889b": {
                "Name": "busybox2",
                "EndpointID": "8f3d2661b8bd9fdf4f9bf2d763e36ab87a7e1fa8dca6e1e97b727c7a8ab2d0fe",
                "MacAddress": "02:42:ac:11:00:03",
                "IPv4Address": "172.17.0.3/16",
                "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busybox1和busybox2两个容器都连接到了bridge网络。两个容器的ip地址也能看到。

进入busybox1容器

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docker exec -it busybox1 sh

通过ip地址和容器名ping容器

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/ # ping 172.17.0.3
PING 172.17.0.3 (172.17.0.3): 56 data bytes
64 bytes from 172.17.0.3: seq=0 ttl=64 time=0.285 ms
64 bytes from 172.17.0.3: seq=1 ttl=64 time=0.130 ms

/ # ping busybox2
^C

可以得出，通过ip地址是可以ping通的，但通过容器名是不行的。

查看hosts信息，也找不到任何busybox2的信息

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cat /etc/hosts
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
172.17.0.2	4f3c61775b5e

新建bridge网络

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docker network create --driver bridge busybox_bridge
bebfcba064b2afdfb265d4df19eaccd950a1d957dcb3e2256d05dc544b64369e

查看网络

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docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
a1681b4a3bc9        bridge              bridge              local
bebfcba064b2        busybox_bridge      bridge              local
d724eb42948a        host                host                local
c9381cce7bbb        none                null                local

分别创建busybox3和busybox4容器，并加入到busybox_bridge网络中

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docker run -dit --network busybox_bridge --name busybox3 busybox
8e39a57b7543288fb716f66eaa4a54609a571c7d30194ca456d4a1dc443f19e6

docker run -dit --network busybox_bridge --name busybox4 busybox
ed1715cfaf168f64351d46aaa7f393cae00962c7ef850d8824abe06a4906843c

进入busybox3

本以为可以PING得通busybox4，但貌似不行，此实验失败。后面再研究。

host模式

以host模式启动一个nginx容器。

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docker run --rm -d --net host nginx
956b96f5d0c25835a1d4470c12ed5e4abda341e44f9344e72cf42864976d96fa

因为是host模式，容器和主机共享一样的网络。

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curl localhost
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
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