linux系统dns固定

# centos7
sed '$ aPEERDNS=no' -i /etc/sysconfig/network-scripts/ifcfg-eth0 && systemctl restart network

# centos6
sed '$ aPEERDNS=no' -i /etc/sysconfig/network-scripts/ifcfg-eth0 && /etc/init.d/network restart