If you have any experience of working on Redhat Enterprise Linux machine and you used yum to install required software, then you might have seen this error. You will need to get your system registered with Redhat Network before you start software installation/configuration on your machine.
Here is the exact error:
yum install mysql
Loading “rhnplugin” plugin
Loading “installonlyn” plugin
This system is not registered with RHN.
RHN support will be disabled.
There could be couple of ways to fix it, either make sure to get registered when you are installing your redhat. Setup Agent utiliy is used to take care of registration issue during installaton of Redhat operating system. If you did not get subscribed during installaion, then still need not worry. You can visit redhar linux’s official site and fill out the form to register your machine with RHN (RedHat Network), you will simply need to provide installation number there and your system will be part of Redhat Network. Cheers!