[Samba] unexplained Replication failures...?

[Denis Cardon]

Hi Vincent,

> I'm running in circles trying to debug replication failures on samba 4.7.6:
>
> dc00 : is a VM on KVM host (attached to a bridge on local LAN)
> dc01 : is a similarly configured VM on another KVM host.
>
> I've forcibly demoted and re-promoted dc01 but I still cannot get
> automatic replication to work:
>
> root at dc00 ~]# samba-tool drs showrepl
> Krynn\DC00
> DSA Options: 0x00000001
> DSA object GUID: 204cb904-754b-4457-af09-9347f8714006
> DSA invocationId: b72fc409-bf9a-45e2-a623-0e668386536a
>
> ==== INBOUND NEIGHBORS ====
>
> DC=ForestDnsZones,DC=ad,DC=lasthome,DC=solace,DC=krynn
>         Krynn\DC01 via RPC
>                 DSA object GUID: 9ac5b74a-383a-4336-9c5d-978b45bad9c9
>                 Last attempt @ Thu May  3 18:50:52 2018 EDT failed,
> result 87 (WERR_INVALID_PARAMETER)
>                 4 consecutive failure(s).
>                 Last success @ NTTIME(0)
>
> All of these show 'Last success @ NTTIME(0)'.
>
> I can force replication manually just fine but automatic replication
> doesn't seem to work.
>
> [root at dc00 ~]# samba-tool dbcheck
> Checking 351 objects
> Checked 351 objects (0 errors)
> [root at dc00 ~]# samba-tool drs replicate DC01 DC00
> dc=ad,dc=lasthome,dc=solace,dc=krynn --sync-forced --full-sync
> Replicate from DC00 to DC01 was successful.

if you need a --sync-forced --full-sync to have replication working, 
then actually it is not working. Try to restart samba with "log level = 
9" in smb.conf and look for the few last message of the replication 
process, it should give you a bit more information about the issue.

Cheers,

Denis

>
> Any ideas?
>
> Vincent
>

-- 
Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0) 2.40.97.57.55
http://www.tranquil.it

Samba install wiki for Frenchies : https://dev.tranquil.it
WAPT, software deployment made easy : https://wapt.fr