[Samba] about samba failover

[Davor Vusir]

2014-06-28 16:10 GMT+02:00 steve <steve at steve-ss.com>:
> On Sat, 2014-06-28 at 08:13 +0200, Davor Vusir wrote:
>> 2014-06-27 2:35 GMT+02:00 Chan Min Wai <dcmwai at gmail.com>:
>> > Hi,
>> >
>> > DFS is possible, but there are some bugs with it (not sure if it is fixed
>> > yet)
>> > it will work only with administrator users :)
>> >
>> > Thank You.
>> >
>>
>> DFS works. I've got a working setup with Folder Redirection and Offline Folders.
>>
>> I believe steve is asking whether it's possible to manage DFS with the
>> DFS Management MMC.
>
> Hi
> The links we sent show that dfs on Samba does not works as dfs on m$.

It is the same with Windows 7 and RSAT. My guess is that the endpoint
mapper that allows DFS management MMC to connect to the domain
controller and read and write to appropriate attributes in AD isn't
yet implemented in Samba. And later to let the PDC emulator hand out
various information on demand for DFS aware clients.

> Domain based dfs is not possible (At least we can't get it to work) and
> failover does not work if the first server in a share is not available.
> Conclusion: dfs cannot be used as a failover solution with samba servers
> and Linux clients.
>

I have always thought of the name 'Distributed File System, DFS' as a
umbrella term for hiding, in some sense, or location transparancy for file
server resources. And I don't think there is anything in the term 'DFS' that
states that it has to support failover, file server priority, site awareness
or other specific features implemented by Microsoft, but just location
transparancy. Unless 'DFS' is a product and trademark of Microsoft.

In comparison with Microsofts implementation of DFS, I agree that
Sambas is somewhat rudimental. But it works. And the Windows DFS
client finds the file server resources. I have no experience of the
Linux variant.

It's interesting that you mention failover, because I was thinking,
when I read the documentation, how this is solved. And I came to the
conclusion that automatic failover does not work, neither does file
server priority. Manual intervention is needed.

Never the less, domain based DFS works. Thanks to Garming, if I recall
correctly.

> Please tell us we're wrong;)

No, I guess not.

Regards
Davor

>
> Cheers,
> Steve
>
>>
>> Regards
>> Davor
>>
>> >
>> > On Thu, Jun 26, 2014 at 4:27 PM, steve <steve at steve-ss.com> wrote:
>> >
>> >> On Thu, 2014-06-26 at 10:18 +0200, Daniel Müller wrote:
>> >> > Drbd does work for Samba3!
>> >> > DFs in Samba does not replicate data. It just does something like, if
>> >> server
>> >> > X/share is not there use server Y/share.
>> >> >
>> >> > Greetings Daniel
>> >> >
>> >> Hi Thanks
>> >> That's no problem, we'll do the replication of the data. What we'd like
>> >> is what windows has. You can specify \\domain\dfs\share and it finds a
>> >> server in the domain with the share. Really easy. I suppose it's a
>> >> nightmare to code though, if it can be done at all. Do we have anything
>> >> like that in samba?
>> >> Cheers,
>> >> Steve
>> >>
>> >>
>> >>
>> >> >
>> >> > 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 steve
>> >> > Gesendet: Donnerstag, 26. Juni 2014 10:12
>> >> > An: samba at lists.samba.org
>> >> > Betreff: Re: [Samba] about samba failover
>> >> >
>> >> > On Thu, 2014-06-26 at 09:08 +1100, me at electronico.nc wrote:
>> >> > > Hi all,
>> >> > >
>> >> > > As many of us, I'm trying to find a way to have a failover solution
>> >> > > for a Samba domain.
>> >> > >
>> >> > > The actual choice has been (because of hardware cost) to have only 1
>> >> > > physical xen-based server (ubuntu 14.04) that do (dom0) :
>> >> > > - DHCP server (LAN)
>> >> > > - NTP server
>> >> > > - firewall
>> >> > > - proxy
>> >> > > - DNS server
>> >> > > Then 4 VMs running for:
>> >> > > - Samba Domain controller
>> >> > > - Samba Domain member (file server)
>> >> > > - Apache2 server
>> >> > > - email server
>> >> > >
>> >> > > As all eggs are in the same basket (French talking), I've setup a 2nd
>> >> > > xen-based server that uses DRBD/Pacemaker to provide the basic dom0
>> >> > > functions.
>> >> > >
>> >> > > Now it's time about Samba ...
>> >> > > ( I've read : https://wiki.samba.org/index.php/Clustered_Samba )  From
>> >> > > other readings, it seems that GlusterFS is not actually a valid
>> >> > > solution (permissions troubles from Windows side).
>> >> > > I was wondering if setting up Samba VMs that would use a RAID1 DRBD
>> >> > > network (RAID1 between xen-host1 and xen-host2) filesystem would be an
>> >> > > acceptable solution.
>> >> > >
>> >> > > Thanks in advance for your thoughts.
>> >> > >
>> >> > > Nicolas
>> >> > >
>> >> > >
>> >> > Hi
>> >> > Sorry that this is just a 'me too' but I've been trying to get
>> >> information
>> >> > on failover too. This may give you some ideas other than clustering as I
>> >> > believe that drdb will not wor with samba.
>> >> >
>> >> > Evidently dfs can be used for this. I know it works great on windows DCs
>> >> and
>> >> > file servers but try as I may, I cannot get a single answer from either
>> >> the
>> >> > cifs nor samba lists on anything t do with it on samba. Here is what I've
>> >> > tried so far:
>> >> >
>> >> > https://lists.samba.org/archive/samba/2014-June/182371.html
>> >> > https://lists.samba.org/archive/samba/2014-June/182387.html
>> >> > http://article.gmane.org/gmane.linux.kernel.cifs/9768/match=domain+dfs
>> >> >
>> >> > HTH
>> >> > Steve
>> >> >
>> >> >
>> >> > --
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>> >>
>> >>
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>
>