Configuring DNS on CentOS, AlmaLinux, and Rocky Linux

How to Change DNS Servers on Your System

To set a new DNS server, you’ll need to edit the resolv.conf file. Open it with any text editor, for example Nano:

nano /etc/resolv.conf

and replace the ip-address with a new one in the line nameserver:

options rotate
options timeout:2
options attempts:1

nameserver 91.228.153.88
nameserver 195.26.237.237
nameserver 31.172.68.71

Also, to keep your settings intact after a reboot, you will need to make changes to the network interface configuration file:

nano /etc/sysconfig/network-scripts/ifcfg-eth0

Enter the new ip on the lines:

DNS1=91.228.153.88
DNS2=195.26.237.237
DNS3=31.172.68.71

Once the changes are applied, the server will use the specified DNS to resolve domain names. These settings are commonly used on VPS and dedicated servers.