Just wanted to add my experience about OS upgrading with FOG already installed.
My advice: Don’t do it.
Why? I’ve been active on these forums for about 3 years. I’ve helped several people with FOG since 1.2.x through to 1.5.x concerning OS upgrading. I’ve watched other community members help even more with this. More often than not, it does not go well. There are cases I remember where everything went fine. But there are more cases where things go wrong. When things go wrong - often the community has tried to help the person get things going. From what I can remember, this has taken days to weeks - sometimes these efforts do not result in the repair of the existing installation. I don’t think it’s worth the effort or risk. We have no way to tell you if your OS upgrade would work or not. If things go wrong, you’ll be stuck without a FOG Server, you may not be able to image, and if all of your hosts are setup to network-boot first, that’d be worse still.
What I would recommend: Migrate to a newly built box or VM.
Why? There’s lots of reasons here.
- Your existing FOG Box will remain unaltered - and not be put at any risk. This is a major safety net. If you are not able to timely build the new box, if the new box has a problem, or any other issue - you still have that old box that is exactly as it was before.
- We know the exact steps involved for migrating a FOG Server from an old box to a new box - regardless of the OS on either. These are all outlined here: https://wiki.fogproject.org/wiki/index.php?title=Migrate_FOG
- I test clean installations of the major branches of FOG on several different Linux distributions daily. These tests are automated and the results are available to the general public. The link to the results is in my signature. With these tests, everyone is able to know ‘with a lot of sureness’ if the latest version of FOG will install successfully on whatever Linux distribution - or not.
- A clean & fresh OS is easier to maintain, has less problems, and is a more ‘known’ state than an upgraded OS where you may or may not have any idea about what’s unique on it.