1，修改为固定ip

vim  /etc/netplan/01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    ens33:
         addresses: [172.20.7.133/24]
         gateway4: 172.20.7.1
         nameservers:
               addresses: [114.114.114.114]


执行生效
netplan   apply