docker 实战---多台物理主机的联网，容器桥接到物理网络
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docker 默认的桥接网卡是docker0它只会在本机桥接所有的容器网卡，举例来说容器的虚拟网卡在主机上看一般叫做veth*** 而docker只是把所有这些网卡桥接在一起，如veth2a4c51b：
[[email protected] ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
[[email protected] ~]# systemctl start dockeer
Failed to start dockeer.service: Unit not found.
[[email protected] ~]# systemctl start docker
[[email protected] ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
docker0 8000.02427091b8df no
[[email protected] ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6ceaacf4f8d6 registry "/entrypoint.sh /etc/" 2 weeks ago Exited (1) 8 days ago 0.0.0.0:5000->5000/tcp backstabbing_mclean
[[email protected] ~]# docker start 6ceaacf4f8d6
6ceaacf4f8d6
[[email protected] ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
docker0 8000.02427091b8df no veth2a4c51b
[[email protected] ~]# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UP qlen 1000
link/ether 00:50:56:25:39:b9 brd ff:ff:ff:ff:ff:ff
inet6 fe80::250:56ff:fe25:39b9/64 scope link
valid_lft forever preferred_lft forever
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
link/ether 00:50:56:25:39:b9 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.10/24 brd 10.0.0.255 scope global br0
valid_lft forever preferred_lft forever
inet6 fe80::250:56ff:fe25:39b9/64 scope link
valid_lft forever preferred_lft forever
6: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 02:42:70:91:b8:df brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
inet6 fe80::42:70ff:fe91:b8df/64 scope link
valid_lft forever preferred_lft forever
8: [email protected]: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP
link/ether 72:b4:21:83:04:b4 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::70b4:21ff:fe83:4b4/64 scope link
valid_lft forever preferred_lft forever
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