[Samba] Restoring single DC virtual machine

L.P.H. van Belle belle at bazuin.nl
Fri Feb 19 10:53:34 UTC 2016


I do it like this, and the site : 
is draft, but works fine, get the samba_backup script,adjust where needed.

Below is tested and in production environment and works fine.

1) full backup of the VM, monthly done of the DC with FSMO roles. 
   I do stop the server for this backup, to avoid problems with locked db's.
   or open files. ), and i have 2 dc's so only a small auth delay in the 
   network with authentication.
   And i do weekly snapshots, while dc is running, here i dont care about 
   openfiles. This is handled by the samba_backup script. 

2) incremental backups for /etc  ( daily ) 
3) separated backup of the samba data. ( with the samba4_backup script )
	( 4 times a day ) 

Note, i have a very clean server as DC with only samba and bind9 installed. 
Backup time is very short, because the full server backup is only 1.2Gb. 
Like : 
Filesystem               Size  Used Avail Use% Mounted on
rootfs                   6.1G  1.2G  4.7G  20% /

Restore options. 

! In case of multiple DC's (and i have 2 DC's now, and are increasing to 4)!

Restore options now are in the following situations. 
1) DC not working anymore,  ( multiple DC's ) 
	- on the other DC, get the FSMO roles. 
	- remove the old DC from the domain, install a new DC. 

2) VM server dead ( and multple DC's are gone )
	- restore full backup of the VM. ( the DC with FSMO roles ) 
	- restore /etc/
	- stop samba, restore the samba backuped data. 
	- start samba
	- install the other dc's again. 

3) VM server running, Guest VM dead. ( and only one DC )
	- restore full backup of the VM. ( the DC with FSMO roles ) 
	- restore /etc/
	- stop samba, restore the samba backuped data. 
	- start samba



> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens
> yvan.masson at openmailbox.org
> Verzonden: vrijdag 19 februari 2016 11:01
> Aan: samba at lists.samba.org
> Onderwerp: [Samba] Restoring single DC virtual machine
> Hi,
> I plan to install one Samba4 DC on a virtual machine to provide services
> for
> less than 50 users:
>   - centralized authentication on 2 or 3 Linux servers
>   - LDAP authentication on an ownCloud server
>   - I do not think that I will join Windows computers to the domain, but
> maybe
> one day.
> I know it is better to install more than one DC to have replication, but
> in a
> so small setup, would it be possible to rely only on VM restoration in
> case of
> a problem (physical server broken, wrong manipulation on AD LDAP…)?
> I have read
> https://wiki.samba.org/index.php/Backup_and_restore_an_Samba_AD_DC,
> but it is still noted as a draft.
> I have also read
> https://technet.microsoft.com/en-us/library/d2cae85b-41ac-497f-8cd1-
> 5fbaa6740ff
> and it seems that the problems, when restoring a VM backup, comes only
> from
> replication between DC.
> This makes me think that it would be OK, but what do you think ?
> Regards,
> Yvan
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