//the following command overwrites /etc/resolv.conf (or when rebooting)
service network restart
//instead, add the following to /etc/sysconfig/network-scripts/ifcfg-eth0
DNS1=4.2.2.2
DNS2=4.2.2.1
!!!!!!!!!!!!!!!!!!!
//open this file
vim /etc/resolv.conf
//add entries
nameserver 4.2.2.2
nameserver 4.2.2.1
//test
nslookup barney.com
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