New to Linux. Inherited an application server running Drupal on CentOS 6.10. Running as a virtual machine on Hyper-V 2016. In order to get my backups working on this CentOS box, I have to upgrade at least to CentOS 6.4. I have never upgraded a Linux box with an application running on it. Can I do an in-place upgrade? I feel my Drupal app could fail because I assume other apps like PHP, etc. will be upgraded as well or do these all run independently of the OS? I see most upgrade documents online have to just run yum-update but I assume that will take me to the latest and greatest which I would guess would really break my Drupal app. Can I upgrade from 6.10 to 6.4 only? How would you do that? Not familiar really with the Drupal installation either so I'm kind of in a quandary on the best way to approach this. I did reach out to a Drupal developers group and they said they don't do this kind of upgrade.