[Samba] Upgrade Ubuntu 20.04 4.16.11 to current

[Luis Peromarta]

 By the way , lately I’ve been using LXC containers (privileged) on proxmox with really fantastic results. On infrastructures with 1000 users DCs run flawlessly with 5GB disk and 256Mb RAM. (Megabytes is correct. )

LP
On 18 Jun 2024 at 20:49 +0100, Luis Peromarta via samba <samba at lists.samba.org>, wrote:
> I’d be careful rolling back DCs from backup. You could have AD inconsistency
>
> With VMs id rather install new DCs and use Debian 12 with back ports. This will give you the very latest 4.20.1 today. This is the best supported way of installing samba.
>
> I’d demote DCs one by one and create the new VM with the new name and IP (not that this is necessary but easier so you don’t change other system as like dhcp)
>
> Be careful before demoting the DC that holds the FSMO roles. Transfer roles before demoting.
>
> samba.bigbird.es/doku.php?id=samba:fsmo-roles
>
> Then try this.
>
> samba.bigbird.es/doku.php?id=samba:aditional-dc
>
> LP
> On 18 Jun 2024 at 19:59 +0100, Greg Sloop
> > I've got a few DC controllers.
> > I believe two are on Ubuntu 20.04, and running 4.16.11.
> >
> > I'm finally getting time to roll these up to something newer.
> >
> > Thus, I'm kind of casting about for the "best" way to "upgrade" these.
> >
> > Some details.
> > All of these are VM's running under XCP-NG - so grabbing a snapshot and
> > rolling back is trivial, if the upgrade goes awry. (At least as long as the
> > DC hasn't made changes to the AD database.)
> >
> > So, as I see it, there are two ways of going about it.
> >
> > Option 1) Upgrade ubuntu from 20.04 to 22.04->24.04 (It has been around a
> > couple of months now for 24.04, so I'd expect it to be pretty stable and an
> > upgrade should go well enough.)
> > Then update the samba packages - I'd probably continue to rely on MJT's
> > repos - and go to 4.20.1.
> >
> > Option 2) Build completely new VM's on 24.04 and install MJT's repos and
> > join them to the domain and then demote and remove all references to the
> > old controllers.
> >
> > (Unless there's some really compelling reason for the second option, I
> > think I'd prefer the first.)
> >
> > Questions about specific components.
> > Any thoughts on using Ubuntu 24.04?
> > Is 4.20.1 stable enough, or should I plan on going to 4.19.7?
> >
> > ---
> > If I upgrade them in-place, I assume the "best" method would be to stop
> > samba and disable from starting at boot.
> > Then run the Ubuntu upgrades.
> > Once those are done, install the desired MJT repo (4.19 or 4.20) and intall
> > the desired version.
> > Then start the AD packages.
> > (I'd probably do the non FSMO controller first, and see how it goes. If it
> > goes well and seems stable I'd try to do the FSMO master next.)
> >
> > What testing should I be doing at that point to verify that everything is
> > ok?
> >
> > Is there a good way of making a solid backup of the AD db, should I need to
> > roll back to it? (Separate from the VM snapshots and backups I already
> > have.)
> >
> > Glad for any pointers!
> >
> > -Greg
> > --
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