Docker: Modifying the DOCKER_OPTS parameter in /etc/default/docker does not take effect

#Modify the configuration file vi /usr/lib/systemd/system/docker.service

[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target
Wants=docker-storage-setup.service
Requires=docker-cleanup.timer

[Service]
Type=notify
NotifyAccess=all
KillMode=process
#Add our custom configuration file EnvironmentFile=-/etc/default/docker #Add configuration file, (- stands for ignore error)
EnvironmentFile=-/etc/sysconfig/docker
EnvironmentFile=-/etc/sysconfig/docker-storage
EnvironmentFile=-/etc/sysconfig/docker-network
Environment=GOTRACEBACK=crash
Environment=DOCKER_HTTP_HOST_COMPAT=1
Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
ExecStart=/usr/bin/dockerd-current \
     --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
     --default-runtime=docker-runc \
     --exec-opt native.cgroupdriver=systemd \
     --userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
     $OPTIONS \
     $DOCKER_STORAGE_OPTIONS \
     $DOCKER_NETWORK_OPTIONS \
     $ADD_REGISTRY \
     $BLOCK_REGISTRY \
     $INSECURE_REGISTRY \
     $DOCKER_OPTS #Parameters that need to be referenced, which are also the network card setting parameters ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity
TimeoutStartSec=0
Restart=on-abnormal
MountFlags=slave

[Install]
WantedBy=multi-user.target
EnvironmentFile=-/etc/default/docker

#Reload systemctl daemon-reload
#Restart the docker service service docker restart 

vi /etc/sysconfig/docker
DOCKER_OPTS="-b=br0"

#Or write data directly echo 'DOCKER_OPTS="-b=br0"' >> /etc/default/docker

#Install bridge tools yum install bridge-utils 

#Add a bridge brctl addbr br0

# View the bridge brctl show 

#Set the bridge address and subnet mask ifconfig br0 192.168.110.1 netmask 255.255.255.0

#Set up the bridge echo 'DOCKER_OPTS="-b=br0"' >> /etc/default/docker

#Configure Docker
vi /usr/lib/systemd/system/docker.service
#Add our own configuration file EnvironmentFile=-/etc/sysconfig/docker
#Application parameters ExecStart=/usr/bin/dockerd-current \
        --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
        --default-runtime=docker-runc \
        --exec-opt native.cgroupdriver=systemd \
        --userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
        $OPTIONS \
        $DOCKER_STORAGE_OPTIONS \
        $DOCKER_NETWORK_OPTIONS \
        $ADD_REGISTRY \
        $BLOCK_REGISTRY \
        $INSECURE_REGISTRY \
        $DOCKER_OPTS #Add bridge parameters #Reload systemctl daemon-reload
#Restart the docker service service docker restart