One thing I dread doing is migrating from older versions of CentOS to newer major versions, like CentOS 5 to CentOS 6, or CentOS 6 to CentOS 7. Mostly because it means deploying new hardware, then mirroring the settings, apps, etc.. before changing DNS and taking it live.
Have you ever tried updating from an older major version to the new one?
Have you ever tried updating from an older major version to the new one?