Docker customizes the bridge

In addition to the docker0 bridge, users can also specify bridges to connect individual containers.

When you start the Docker service, use -b BRIDGE --bridge=BRIDGE specify the bridge to use.

If the service is already running, you need to stop the service first and remove the old bridge.

$ sudo service docker stop
$ sudo ip link set dev docker0 down
$ sudo brctl delbr docker0

Then create a bridge bridge0

$ sudo brctl addbr bridge0
$ sudo ip addr add 192.168.5.1/24 dev bridge0
$ sudo ip link set dev bridge0 up

Check to confirm that the bridge was created and started.

$ ip addr show bridge0
4: bridge0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state UP group default
    link/ether 66:38:d0:0d:76:18 brd ff:ff:ff:ff:ff:ff
    inet 192.168.5.1/24 scope global bridge0
       valid_lft forever preferred_lft forever

Configure the Docker service, which is bridged by default to the created bridge.

$ echo 'DOCKER_OPTS="-b=bridge0"' >> /etc/default/docker
$ sudo service docker start

Start the Docker service. Create a new container and you can see that it has been bridge0

You can continue to view the bridged information with the brctl show command. In addition, ip addr and ip addr can be ip route in containers to view IP address configuration and routing information.