First of all, a great "thank you" Jan-Marek for pointing out the (very
probable) root cause of the problem.
First, I tried to mount using minorversion=1. Unfortunately, NFS4.1
appears not to be supported:
root@bural:/home/sylvain# mount -t nfs4 real.chicoree.fr:/homes /mnt -o
sec=krb5,minorversion=1
mount.nfs4: Protocol not supported
Both client & server having the same packages (Wheezy + NFS/linux-image
from Jessie):
ii libnfsidmap2:amd64 0.25-4 amd64 NFS idmapping library
ii linux-image-3.9-1- 3.9.6-1 amd64 Linux 3.9 for
64-bit PCs
ii nfs-common 1:1.2.8-4 amd64 NFS support files
common to client and se
ii nfs-kernel-server 1:1.2.8-4 amd64 support for NFS
kernel server
What is the minimum kernel/package version required to use NFS4.1 on Debian?
-------
After that, I tried to stick to NFS4.0, having both gssd and svcgssd
running on the client and the server. So I installed
nfs-{common,kernel-server} on both machines.
But, just installing nfs-kernel-server and editing
/etc/defaults/nfs-kernel-server to force execution of rpc.svcgssd is not
sufficient on the client, since the init script won't run rpc.svcgssd if
there is no export.
So, I manually ran svcgssd on the client and gssd on the server ("real"
is the server. "bural" the client):
root@real:~# ps -edf | grep gssd
root 3753 1 0 Jul08 ? 00:00:00 /usr/sbin/rpc.svcgssd -vvv
root 5254 5193 0 14:58 pts/0 00:00:00 grep gssd
root@real:~# /usr/sbin/rpc.gssd -fvvv
beginning poll
destroying client /var/lib/nfs/rpc_pipefs/nfsd4_cb/clntf
root@bural:/home/sylvain# ps -edf | grep gss
root 14146 1 0 14:46 ? 00:00:00 /usr/sbin/rpc.gssd -vvv
root 14246 14142 0 15:00 pts/5 00:00:00 grep gss
root@bural:/home/sylvain# /usr/sbin/rpc.svcgssd -fvvv
entering poll
As far as I can tell, both GSS servers are running on both machines.
However, this does not appear to solve the issue. Despite "-vvv" option,
I see no informations. But I still have the usual messages on server's
syslog:
Jul 10 15:29:00 real kernel: [166575.902975] RPC: AUTH_GSS upcall timed out.
Jul 10 15:29:00 real kernel: [166575.902975] Please check user daemon is
running.
Probably, there is there something I missed while launching the gss
services? Maybe there is some other services to restart?
----
And now for something different:
The attached patch improves Nicolas version for the cases of NFS version
!= 4.0, where svcgssd is not needed.
This is probably a corner case, but I'm not sure Nicolas' patch will
behave as expected when the client import both 4.0 and 4.x shares:
nfs40.server:/this /this nfs4 rw,sec=krb5 0 0
nfs41.server:/that /that nfs4 rw,sec=krb5,minorversion=1 0 0
-- Sylvain
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