Docker容器网络

在分享06中学完了bridge网络，接着学习none网络和host网络。

Docker在安装时会在host上默认创建三个网络，分别是bridge、host、null。

[root@promote ~]# docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
527281654b19        bridge              bridge              local
9ab80c94885b        host                host                local
c42335728d98        none                null                local

none网络

none网络就是什么网络都没有，就和一台没有联网的PC一样，可以在创建容器时通过--network=none指定。

[root@promote ~]# docker run -it --name busybox --network none docker.io/busybox
/ # ifconfig
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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

创建完成后查看网络，发现只有一个回环设备，没有网卡设备（这里用的镜像是busybox，因为busybox包含了一些像ifconfig简单的命令，一开始我用的是centos镜像，后来发现centos镜像没有ifconfig命令，需要安装，而我创建的是无网络环境，所以就换成了busybox）。

host网络

host网络就是连接host网络的容器与主机共享网络，且网络配置一致。

[root@promote ~]# docker run -it --name busybox --network host docker.io/busybox
/ # ifconfig
docker0   Link encap:Ethernet  HWaddr 02:42:80:4B:97:72
          inet addr:172.17.0.1  Bcast:0.0.0.0  Mask:255.255.0.0
          UP BROADCAST MULTICAST  MTU:1500  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:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

ens33     Link encap:Ethernet  HWaddr 00:0C:29:EB:2D:01
          inet addr:192.168.41.133  Bcast:192.168.41.255  Mask:255.255.255.0
          inet6 addr: fe80::4881:9be0:2bb6:62e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:586 errors:0 dropped:0 overruns:0 frame:0
          TX packets:410 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:51651 (50.4 KiB)  TX bytes:46089 (45.0 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:68 errors:0 dropped:0 overruns:0 frame:0
          TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:6044 (5.9 KiB)  TX bytes:6044 (5.9 KiB)

再来看一下主机的网络。

[root@promote ~]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
         inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
         ether 02:42:80:4b:97:72  txqueuelen 0  (Ethernet)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.41.133  netmask 255.255.255.0  broadcast 192.168.41.255
        inet6 fe80::4881:9be0:2bb6:62e  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:eb:2d:01  txqueuelen 1000  (Ethernet)
        RX packets 619  bytes 54111 (52.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 431  bytes 48129 (47.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 68  bytes 6044 (5.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 68  bytes 6044 (5.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

可以发现他们是一致的。