1. 程式人生 > >從零開始學習docker(五)網路的另外兩種型別host,none

從零開始學習docker(五)網路的另外兩種型別host,none

前面我們已經介紹了bridge network,比較複雜。這一節介紹host和none這兩種簡單的network。

none Network

首先介紹none型別的Network。首先看一下我們的網路:

 duandingyang@duandingyangdeMacBook-Pro  ~/docker/ubuntu-16.04  docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
6862ec731e70        bridge              bridge              local
27b794790b92        host                host                local
c0ccd5a52bf1        none                null                local

建立一個none型別的容器:

docker run -it  --name test1 --network none vincent/ubuntu-base /bin/bash

檢視none網路的詳細資訊:

docker network inspect none
[
    {
        "Name": "none",
        "Id": "c0ccd5a52bf1a09e45ca879e9a2dd32d6987b7d43bd01e0924af501510af4c26",
        "Created": "2019-06-29T08:14:06.043680652Z",
        "Scope": "local",
        "Driver": "null",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": []
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "9a7ce6d97102fb8d820d4a649a4d5844e6490e64416267da2dc255ebd4c7688c": {
                "Name": "test1",
                "EndpointID": "8914a0bd63984e018cc4ce9f629e964941030a63277df13fc78175954bededfc",
                "MacAddress": "",
                "IPv4Address": "",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

可以看到test1容器的ip為空。

進入到容器中檢視ifconfig:

root@9a7ce6d97102:/usr# ifconfig
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

我們發現只有一個lo網絡卡。沒有其他的網絡卡。意味著test1容器所在的namespace是一個孤立的Network namespace。除了使用docker exec -it test1 /bin/bash這種方式訪問容器外,沒有任何方式可以訪問容器了。

那麼這種容器存在的意義是什麼呢?

當安全性要求比較高的時候,儲存密碼等工具可以用這種方式實現。

host Network

將上面的test1容器停止,並刪除容器。

建立host Network容器:

docker run -it  --name test1 --network host vincent/ubuntu-base /bin/bash

檢視host網路資訊:

docker network inspect host
[
    {
        "Name": "host",
        "Id": "27b794790b9286a90285386b1ddd4d1703668e1b57b9e0dd47261c86de52452b",
        "Created": "2019-06-29T08:14:06.08051536Z",
        "Scope": "local",
        "Driver": "host",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": []
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "c56f09a40a89293affb4120ac698c1add5796d871683c1ded162b44bd2f5a7ba": {
                "Name": "test1",
                "EndpointID": "969c508af1d2448c4b1028f80ee0b4aca2fa7856a2c3c92f4def251781bf6488",
                "MacAddress": "",
                "IPv4Address": "",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

可以看到test1同樣沒有ip地址和mac地址。

進入到容器中檢視ifconfig:

root@linuxkit-025000000001:/usr# ifconfig
docker0   Link encap:Ethernet  HWaddr 02:42:27:c4:e8:bd
          inet addr:172.17.0.1  Bcast:172.17.255.255  Mask:255.255.0.0
          inet6 addr: fe80::42:27ff:fec4:e8bd/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:108020 errors:0 dropped:0 overruns:0 frame:0
          TX packets:260692 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4347447 (4.3 MB)  TX bytes:381499475 (381.4 MB)

eth0      Link encap:Ethernet  HWaddr 02:50:00:00:00:01
          inet addr:192.168.65.3  Bcast:192.168.65.255  Mask:255.255.255.0
          inet6 addr: fe80::50:ff:fe00:1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:261768 errors:0 dropped:0 overruns:0 frame:0
          TX packets:109131 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:381626776 (381.6 MB)  TX bytes:5951813 (5.9 MB)

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:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:140 (140.0 B)  TX bytes:140 (140.0 B)

發現他的網絡卡與我們的宿主機上是很相似的。

通過host方式建立的容器,沒有獨立的Network namespace,跟我們的主機的Network namespace共享。

使用這種方式會出現ip衝突和埠