Re: Building ZFS disk images

On 9/28/21 9:15 AM, Rodney W. Grimes wrote:
>> On Tue, Sep 28, 2021 at 9:48 AM Rodney W. Grimes
>> <freebsd-rwg@gndrsh.dnsmgr.net> wrote:
>>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>>>>>>> re-guid the pool on first boot.
>>> Isnt the proper place to solve this lack of Unique UUID creation
>>> in the tool(s) that are creating the zfs pool in the first place.
>>>
>>> Fixing it "post boot" seems to be a far to late hack and doesnt
>>> fix any of the situations where one might import these pools
>>> between creation and first boot.
>> No, because you might create a VM image once, then instantiate it
>> dozens or thousands of times.  The firstboot solution is great because
>> it lets you reuse the same image file.
> I would continue to argue that the place to fix this is in the
> "instantiate tool".  ESXI vmfs deals with this all the time
> when you clone a disk.  And again the "fix at boot" does not
> deal with the problem in that if I "instatiate" 10 copies of
> a zpool for VM's and then try to mount 2 of them at once on
> the host this problem rares it head.   Fix the problem as close
> to point of creation as possible for minimal issues in all
> operations for everyone.

Define a special magic "change to something else" ID that will always 
do the right thing exactly once.