配置/etc/resolv.conf （立即生效，但是并非永久）
vim /etc/resolv.conf
修改
nameserver 223.6.6.6
nameserver 114.114.114.114
nameserver 8.8.8.8
nameserver 223.5.5.5
配置网卡
查看网卡
ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.16.3.186 netmask 255.255.255.0 broadcast 172.16.3.255
inet6 fe80::20c:29ff:fe45:3a73 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:45:3a:73 txqueuelen 1000 (Ethernet)
RX packets 927126 bytes 963481900 (918.8 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 235263 bytes 54203132 (51.6 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
编辑网卡配置
vim /etc/sysconfig/network-scripts/ifcfg-ens33
DNS1=223.5.5.5
DNS2=114.114.114.114
DNS3=8.8.8.8
DNS4=223.6.6.6
重启网卡
service network start
如果提示不存在，则执行
nmcli c reload