1. centos system administrator account password
2. cd/etc/sysconfig/network-script/
3. ls View
4.vi edit ifcfg-ens33 (different name server NIC fails, you can view specific ip a)
5. Press esc, enter: wq (lowercase) save!
6. Restart the network systemctl restart network
7. ip a network address to see whether the configuration
8. Test whether the network through
ping the gateway or ping 114.114.114.114