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:
[root@docker1 ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
[root@docker1 ~]# systemctl start dockeer
Failed to start dockeer.service: Unit not found.
[root@docker1 ~]# systemctl start docker
[root@docker1 ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
docker0 8000.02427091b8df no
[root@docker1 ~]# 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
[root@docker1 ~]# docker start 6ceaacf4f8d6
6ceaacf4f8d6
[root@docker1 ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.0050562539b9 no ens33
docker0 8000.02427091b8df no veth2a4c51b