[Samba] about samba failover

[Daniel Müller]

Quick and dirty 
Setup up your 2 fileservers join them to samba. set up a floating ip running
(pacemaker?ucarp?).
Host the file shares on mount point with glusterfs replications.

Good luck
Daniel


EDV Daniel Müller

Leitung EDV
Tropenklinik Paul-Lechler-Krankenhaus
Paul-Lechler-Str. 24
72076 Tübingen 
Tel.: 07071/206-463, Fax: 07071/206-499
eMail: mueller at tropenklinik.de
Internet: www.tropenklinik.de




-----Ursprüngliche Nachricht-----
Von: samba-bounces at lists.samba.org [mailto:samba-bounces at lists.samba.org] Im
Auftrag von Davor Vusir
Gesendet: Sonntag, 29. Juni 2014 06:50
An: steve
Cc: samba at lists.samba.org
Betreff: Re: [Samba] about samba failover

Den 28 jun 2014 23:42 skrev "steve" <steve at steve-ss.com>:
>
> On Sat, 2014-06-28 at 21:50 +0200, Davor Vusir wrote:
> > 2014-06-28 20:16 GMT+02:00 steve <steve at steve-ss.com>:
> > > On Sat, 2014-06-28 at 20:02 +0200, Davor Vusir wrote:
> > >
> > >>
> > >> Never the less, domain based DFS works. Thanks to Garming, if I
recall
> > >> correctly.
> > >
> > > Hi
> > > That's exactly what we want. Two domain file servers carry the 
> > > same share. One goes down, there's still another left with the same
share.
> > >
> > > Can you point us at a howto?
> > > Thanks,
> > > Steve
> > >
> > >
> >
> > Hi!
> >
> > I haven't found a howto. If you can't Explore to 
> > \\example.org\netlogon, I suggest you revert to Ubuntu 12.04 for 
> > starters. :)
>
> Yes, but that's as far as it goes. We can only see the shares on the 
> DC, but only netlogon and sysvol. If we create our own share, it does 
> not show. Neither do any other shares on the dfs root we have set on 
> our file server. We _always_ have to specify the file server, so 
> domain dfs does not work.
>
>
Oh! Sorry, I didn't get that. I regard you as a seasoned sysadmin and you
would never make such a mistake. It has to be a typo in smb.conf after long
days trying to get DFS to work.

Regards
Davor

> >
> > According to the documentation
> > (https://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/msdfs.h
> > tml
),
> > it is not possible in my opinion. At least not with automatic 
> > failover. Because there is not enough information embedded in Sambas 
> > implementation that informs the (Windows) client which server is to 
> > prioritize and which is secondary and for how long this information 
> > is valid. You can create links to several shares but you can't 
> > determine which server the client will connect to (if it does not 
> > connect alphabetacally(?)). If client A connects to server A the 
> > first time, and client B connects to server B, you have to implement 
> > two-way synchronization. There is no way to determine if the 
> > opposite occurs at the next logon. The documentation fails to tell.
> >
> > The only thing you know is that domainbased DFS is possible. The 
> > availability solution is for you to decide.
> >
> > I think it boils down to a solution with one (1) link to either a 
> > cold stand-by server or a hot stand-by server(cluster) of some sort.
> >
> > If you choose the cold stand-by solution, you'll have to 'relink' to 
> > the stand-by server manually in case of server crash. Does rsync 
> > copy open files? How often is enough? Every five minutes? Or is 
> > inotify (
http://www.kutukupret.com/2011/06/28/postfix-one-way-maildir-replication-bac
kup-using-inotify-and-rsync/
)
> > good enough?
> >
> > If you choose the hot stand-by solution, I think DRBD will be
satisfactory.
> >
> > With the first solution you will loose data/information. The second 
> > guaranties consistency.
> >
> > The trick is one link to one server. High avaliability not included.
> >
> > Regards
> > Davor
>
>
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