First, edit the resolv.conf file using a terminal command like sudo nano /etc/resolv.conf, then add a line such as nameserver 8.8.8.8 to specify the DNS server, and ensure proper file permissions with chmod if needed for changes to take effect.

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To configure a DNS server on Linux, edit the resolv.conf file by adding DNS entries like "nameserver 8.8.8.8". Use terminal commands to modify the file and ensure proper permissions for changes to take effect.