[Samba] CTDB and NFS4

[Stephen Ward]

Hi L.P.H van Belle,

Thank you for your suggestion, as NFS4 is already working and it is just
the clustering setup that I am having issues with I'm not sure if this
would still help?


On Tue, Mar 11, 2014 at 9:30 PM, L.P.H. van Belle <belle at bazuin.nl> wrote:

> only thing in know for NFSv4
> add in krb5.conf in
> [libdefaults]
> allow_weak_crypto = true
>
> then nfs4v wil work. ( tested in a non CTDB setup )
>
>
>
>
>
> >-----Oorspronkelijk bericht-----
> >Van: sw_samba at nzgeek.com
> >[mailto:samba-bounces at lists.samba.org] Namens Stephen Ward
> >Verzonden: dinsdag 11 maart 2014 9:09
> >Aan: Volker.Lendecke at sernet.de
> >CC: samba at lists.samba.org
> >Onderwerp: Re: [Samba] CTDB and NFS4
> >
> >Hi Volker, thank you for your comments.
> >
> >Using CTDB with an NFS server if I mount with the version 3 option then
> >stop ctdb on the server the client fails over to the new
> >server fine.  Same
> >client, same servers, same process but mounting with the
> >version 4 option
> >and when CTDB fails over the client locks.  After ten minutes or so I
> >killed the process on the client, it was still not responsive.
> >
> >As I understand it this works because the NFS daemons share records and
> >'tickle' connections on failover (see
> >https://wiki.samba.org/index.php/CTDB_Setup#Setting_up_CTDB_for
> >_clustered_NFS
> >).
> >
> > NFS4 works fine except for failover and NFS3 works fine
> >including failover
> >so I assume that it is specifically an issue with NFS4 with CTDB.
> >
> >My understanding of specifically how this works is limited so
> >if anyone has
> >any ideas about this at all I'd be really keen to hear!
> >
> >
> >On Tue, Mar 11, 2014 at 8:30 PM, Volker Lendecke
> ><Volker.Lendecke at sernet.de>wrote:
> >
> >> On Fri, Mar 07, 2014 at 12:32:01PM +1300, Stephen Ward wrote:
> >> > I'm sorry if this has already been covered somewhere, but
> >I've had a look
> >> > and can't find it.  Also if there is a better place for
> >this question,
> >> > please let me know.
> >> >
> >> > I know that the CTDB documentation states that only NFS2/3
> >are supported
> >> > with CTDB but what I'd really like to know is why NFS4
> >won't work and if
> >> > NFS4 support is planned for the future (timeline?).  Also
> >can anyone
> >> > suggest any work arounds/development versions/anything
> >that may help with
> >> > this?
> >> >
> >> > I have a cluster that works well with samba4 and NFS3 (on
> >GPFS/RHEL) but
> >> > unsurprisingly, while NFS4 works ok normally, if I stop
> >the server a
> >> client
> >> > is using any access attempts will freeze on the client.
> >>
> >> Is that really a NFS4/CTDB question? With hard mounts that's
> >> pretty much what I would expect.
> >>
> >> Volker
> >>
> >> --
> >> SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
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> >>
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> >
>
>