在centos7.9中 修改docker0 的网卡默认IP地址

docker0网卡的默认IP地址为172.17.0.1/16

因此很可能会与企业网中的业务地址冲突，为了解决这个问题，必须修改docker0的网卡配置，操作如下

1、查看网卡docker0的默认地址 ip address show docker0

ip address show docker0

4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:64:11:2f:d4 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever

2、关闭docker服务 systemctl stop docker

3、使用cat查看docker的配置文件 cat /etc/docker/daemon.json

cat /etc/docker/daemon.json
{
 "data-root": "/var/lib/docker",
 "live-restore": true,
 "log-driver": "json-file",
 "log-opts": {
  "max-file": "3",
  "max-size": "10m"
 }
}

3、使用vim修改docker的配置文件，默认配置文件中不存在"bip": "172.19.252.1/24",将此配置插入到配置文件中。默认不写就是172.17.0.1/16

vim /etc/docker/daemon.json
{
 "data-root": "/var/lib/docker",
 "live-restore": true,
 "log-driver": "json-file",
 "bip": "172.19.252.1/24",
 "log-opts": {
  "max-file": "3",
  "max-size": "10m"
  }
}

4、启用docker服务systemctl start docker

5、刷新并查看docker网卡配置，此时我们看到ip地址已正确更改为172.19.252.1/24的配置

ip addr flush dev docker0
ip addr show docker0

4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 02:42:64:11:2f:d4 brd ff:ff:ff:ff:ff:ff
    inet 172.19.252.1/24 brd 172.19.252.255 scope global docker0
       valid_lft forever preferred_lft forever

6、如果ip还未修改过来，请尝试reboot重启服务器后再次查看