[Samba] DC upgrade questions

[L.P.H. van Belle]

> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Pietro Stäheli via samba
> Verzonden: maandag 23 september 2019 13:18
> Aan: samba at lists.samba.org
> Onderwerp: [Samba] DC upgrade questions
> 
> Hi folks,
> 
> Yet another upgrade question! Reading the mailing list regarding
> upgrades in the past few months has made me a little apprehensive.
> 
> After now running a single Samba DC for a few months and excising the
> last remnants of the old Windows DC, I would like to join 
> another Samba DC to the existing one.
> 
> Current one (DC2) is running Samba 4.5 on Debian Stretch. samba-tool
> dbcheck looks clean after removing entries from previous Windows DC.
> 
> My plan is to join a Samba 4.10 DC (DC3) on Debian Buster using Louis'
> packages, transfer FSMO roles and sysvol to this one, then upgrade DC2
> to Buster and Samba 4.10 (with steps to 4.7, 4.8 and 4.9 in between).
> 
> Is this the best approach to do this? Is it necessary to demote DC2
> first? The demote/rejoin procedure is recommended for 4.7 and 
> up, so I'm not sure that this is also recommended for 4.5.

Your steps are good to go. 
You can shorten it a bit. 

4.5 -> 4.8 -> 4.9 -> 4.10 
* you can skip 4.7.
* some report good results 4.5 -> 4.9 -> 4.10 
And few  reports of successfull upgrade from 4.5 to 4.10 in one go.

But at this moment i recommend still the smaller steps. 
In this path (4.5 -> 4.8 -> 4.9 -> 4.10 ) 

There are a few changes which pulls in extra packages or remove packages.
I recommend also to use : apt-get dist-upgrade --autoremove --purge

This upgrade needed packages, installs if needed extra once, and removes and purged the older version in one go. 


Greetz, 

Louis