We've got a server running cPanel on CentOS 5.10 currently, and I'm considering whether it's worthwhile or even wise to look at upgrading to CentOS 6.4.
The server is virtualised on 2012 R2 Hyper-V, and I get the impression that CentOS 6.x has better Hyper-V support which would obviously be desirable, but that impression may be flawed.
Looking online I can't find much in the way of documentation on this subject, but some of what I can find indicates that it can be risking, and some people strongly suggest attempting a major version in-place upgrade on a production system is a very bad idea (a view I'm tempted to believe).
Fortunately in terms of testing I do have another box available. We currently have a 2nd licenced cPanel box, running the same OS version (built with the old version purely to test a recent migration from VMWare, so not currently in production), so I can use that to test things initially.
What would people say are the main dangers / pitfalls / likely problems of doing such an upgrade? Is there any real benefit to performing the upgrade (I understand 5.x will continue to be supported for a few years yet)?