[Samba] about samba failover

[Davor Vusir]

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.html
),
> > 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-backup-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
>
>