Upgrading Samba 4 by vampire?

[Andrew Bartlett]

On Thu, 2010-11-04 at 11:02 +0100, Angelos Oikonomopoulos wrote:
> On 11/03/2010 10:49 AM, Angelos Oikonomopoulos wrote:
> > Hello all,
> >
> > for my setup it is likely that I'll have to use virtual machines to run
> > Samba 4 as a domain controller. So this gave me the idea of upgrading by
> > building a VM with the newer Samba 4 version, joining the domain as a DC
> > and then decommissioning the older Samba 4 VM. In particular, since I
> > plan to run a redundant setup, I'd like to do that in pairs (i.e.
> > joining two new VMs to the domain, then taking out the old ones).
> >
> > Is this expected to work? Any other considerations I'm not aware of?
> 
> I've asked about this on IRC also and Andrew Bartlett advised against 
> using vampire to upgrade to a newer Samba 4 version. He was also 
> skeptical about my other idea of cloning a Samba 4 VM, upgrading using 
> upgradeprovision and then removing the VM with the old Samba 4 version.

I perhaps should clarify - this is a reasonable approach, as long as
there is only one Samba4 server, and the clones are never online at the
same time, and the old clone is never put back online.  

> Apparently the recommended way to upgrade a redundant Samba4 setup 
> involves demoting a server, then upgrading to the newer Samba4 version, 
> then re-promoting it, although I'm not yet clear on how to do the 
> demoting. I'd be happy to put together an upgrade guide if someone can 
> guide me through the demoting procedure.

We do need to clarify that, certainly.

Andrew Bartlett

-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Cisco Inc.
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