Recommendations on unmount parititons of active VM in order to change UUIDs?

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I'm trying to speed up our deployment of RHEL VMs, as we use vCenter. So I've created a VM, converted it to a template and then spin clones off of that.

Of course we have to change the UUIDs for any of the partitions that fall under LVN.

My question is how do I unmount these partitions while the VM is up and running in order to change the UUIDs? I always seem to run into something running that won't allow me to unmount.

IMO, it almost easier to create a new VM from scratch Vs trying to umount partitions and update UUIDs.

CM
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ir. Jan Gerrit Kootstra's picture Guru 6222 points
7 June 2018 4:00 PM

Hi Christopher,

Why do you need to change UUIDs of the partitions? An UUID only needs to be unique within a (virtual) server.

Regards,

Jan Gerrit Kootstra

CM Expert 1105 points
7 June 2018 4:04 PM

If I'm spinning up multiple VMs from a template created in VMWare vCenter and they all have the same UUIDs, won't this pose a problem?

ir. Jan Gerrit Kootstra's picture Guru 6222 points
7 June 2018 5:41 PM

No, just cloned a VM and it works on disk level.

You must off course see to it that the ip-addresses and hostname are changed, for these need to be unique (they are exposed to the outside world).

CM Expert 1105 points
7 June 2018 7:38 PM

Correct, would make sure that the ip address and hostname and unique for all VMs.

I can't remember what website I saw...Maybe I can search for it, however I thought that all LVM partitions had to have unique UUIDs, to prevent some sort of conflicts.

ir. Jan Gerrit Kootstra's picture Guru 6222 points
7 June 2018 5:43 PM

Satellite 6.x has some issues if you have already registered the server that you used to create the template. I needed to reregister both the original and the new VM, because the UUID for the Satellite registration where non-unique.

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