Changing DNS in CentOS

1. Edit resolv.conf and use your chosen name servers. Here we are using Google DNS.

> vi /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4

2. To prevent your resolv.conf from being overwritten on reboot, also change ifcfg-eth0.

> vi /etc/sysconfig/network-scripts/ifcfg-eth0
DNS2=8.8.4.4
DNS1=8.8.8.8

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