To set or reconfigure your Linux server’s DNS server:
Open the /etc/resolv.conf configuration file:
vim /etc/resolv.conf
Set or update the name server line(s) to point to the desired DNS server(s), as shown in the example below:
nameserver 192.168.1.100 nameserver 192.168.1.101
Save the changes to apply the new DNS server configuration.
Resources: