Docker 之 四种网络模型

一、NAT(默认)

NAT网络模型，默认情况下，均为NAT模式，如网络的端口映射就为NAT

二、None(无网络)

格式：docker run --net=none

[root@docker ~]# docker run --rm -ti --net=none centos:centos7

三、Host(与主机相同IP)

格式：docker run --net=host

[root@docker ~]# docker run --rm -ti --net=Host centos:centos7
[root@docker /]# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
inet 172.7.5.1  netmask 255.255.255.0  broadcast 172.7.5.255
inet6 fe80::42:28ff:fe56:8b6  prefixlen 64  scopeid 0x20<link>
ether 02:42:28:56:08:b6  txqueuelen 0  (Ethernet)
RX packets 135990  bytes 9017234 (8.5 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 158771  bytes 317188403 (302.4 MiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 10.3.153.120  netmask 255.255.255.0  broadcast 10.3.153.255
inet6 fe80::36aa:b367:aa13:b475  prefixlen 64  scopeid 0x20<link>
ether 00:50:56:9b:00:06  txqueuelen 1000  (Ethernet)
RX packets 747539  bytes 528246025 (503.7 MiB)
RX errors 0  dropped 1227  overruns 0  frame 0
TX packets 249250  bytes 38867074 (37.0 MiB)
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 1  (Local Loopback)
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

四、联合网络（即两个容器共用一个IP地址）

第一个容器运行
-----
[root@docker ~]# docker run --rm -ti centos:centos7     #以nat模式启动了一个容器
[root@2f504d6966dc /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 172.7.5.2  netmask 255.255.255.0  broadcast 172.7.5.255     #IP172.7.5.2
ether 02:42:ac:07:05:02  txqueuelen 0  (Ethernet)
RX packets 7417  bytes 13726936 (13.0 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 6118  bytes 473182 (462.0 KiB)
TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

第二个容器运行，以联合网络的方式
-----
格式：Docker run —net=container:${container_id}

[root@docker ~]# docker ps       #查看第一个容器的ID值
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
2f504d6966dc        centos:centos7      "/bin/bash"         6 minutes ago       Up 6 minutes                            thirsty_bhabha
[root@docker ~]# docker run --rm -ti --net=container:2f504d6966dc centos:centos7
[root@2f504d6966dc /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
inet 172.7.5.2  netmask 255.255.255.0  broadcast 172.7.5.255
ether 02:42:ac:07:05:02  txqueuelen 0  (Ethernet)
RX packets 15431  bytes 27381590 (26.1 MiB)
RX errors 0  dropped 0  overruns 0  frame 0
TX packets 13359  bytes 1061065 (1.0 MiB)
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
loop  txqueuelen 1  (Local Loopback)
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