Docker-compose creates a bridge, adds a subnet, and deletes a network card

[root@i ~]# brctl addbr docker0
[root@i ~]# ip addr add 192.168.42.1/24 dev docker0  
# The ip here is for internal use in docker, you can configure any one[root@i ~]# ip link set dev docker0 up
[root@i ~]# ip addr show docker0
# View docker
[root@i ~]# systemctl restart docker
[root@i ~]# systemctl restart docker
# Start the docker service

[root@i ~]# docker network create backend
# In this way, we have created the backend subnet, and docker-compose can directly use this network
# If the subnet is not common, use the following command to skip the security issue [root@i ~]# docker network create backend --subnet 172.24.24.0/24
 
[root@i ~]# docker network ls
NETWORK ID NAME DRIVER SCOPE
6afff4d90f05 backend bridge local
57de7f32064e bridge bridge local
4b44a5340d6e host host local
ac8e8ffe243f none null local

[root@i ~]# brctl show
#Check the bridge status bridge name bridge id STP enabled interfaces
br-5db3fa0c465f 8000.02424cfb3937 no veth038d483
                            veth2950f5c
                            veth669dc5e
                            veth715203f
                            veth9f31643
                            vethd0f5330
docker0 8000.3a4803cd6298 no veth9d3badb
                            vethd7530fd
[root@i ~]# brctl delif <bridge name> <port name>
#Uninstall the port on the bridge [root@i ~]# ifconfig
# Check if there is a bridge network card name [root@i ~]# ifconfig <bridge name> down
#Turn off this network card[root@i ~]# brctl delbr <bridge name>
#Delete the bridge

[root@node100 docker-compose]# docker info | grep 'Server Version'
 Server Version: 19.03.12

docker-compose -f docker-compose.yml down

# Stop the Docker container sudo systemctl stop docker
# Stop the docker0 bridge sudo ip link set dev docker0 down
# Delete the docker0 bridge sudo brctl delbr docker0
# Reset iptables
sudo iptables -t nat -F POSTROUTING

# linux brctl command not found, install brctl 
yum install bridge-utils -y

# Edit the daemon.json file vim /etc/docker/daemon.json

# Add the following content, including setting the IP segment of the Docker container "default-address-pools": [
  {
   "base" : "192.168.0.0/16",
   "size" : 24
  }
]

sudo systemctl daemon-reload
sudo systemctl start docker

docker-compose -f docker-compose.yml up -d