All over the web, you might encounter some much needed files are archived using RAR, like your Linux course certification files, for example. That’s when, it’s useful to know how to extract them using the proper software.

This can happen after a fresh installation of CentOS. The /etc/resolv.conf is looking for a DNS that it can use but after a fresh installation, it usually comes empty. So, if the file has no DNS to look after, then it can not resolve hostnames. This should tell you that the current machine is using the wrong DNS server.