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Old 10-19-2010, 09:55 AM   #1
pinkunicorn
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Registered: Oct 2010
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Can't mount nfs4 directories with Kerberos auth on CentOS 5


I have an nfs server running Solaris. It works fine and a large number of clients happily mount directories from it. But only almost all clients.

All clients that have problem run CentOS (5.4 and 5.5). I've found one or two of each version that fail, but also a couple of each version that work.

The mounting is done via autofs but that doesn't seem to make any difference. Kerberos is used for authentication.

When I try to mount a directory manually I get this:
Code:
# mount -vvvv -t nfs4 -o sec=krb5 triangulum.ifm.liu.se:/export/users/hans /mnt
mount: pinging: prog 100003 vers 4 prot tcp port 2049
mount.nfs4: Permission denied
I get this in /var/log/messages:
Code:
Oct 15 15:15:12 pc13287 rpc.gssd[2780]: rpcsec_gss: gss_init_sec_context: (major) Unspecified GSS failure.  Minor code may provide more information - (minor) Unknown code krb5 60 
Oct 15 15:15:12 pc13287 rpc.gssd[2780]: WARNING: Failed to create krb5 context for user with uid 0 with any credentials cache for server triangulum.ifm.liu.se
For comparison, a working machine logs this in /var/log/messages:
Code:
Oct 19 13:26:01 pc14113 rpc.gssd[2793]: ERROR: GSS-API: error in gss_acquire_cred(): Unspecified GSS failure.  Minor code may provide more information - Unknown code krb5 195 
Oct 19 13:26:01 pc14113 rpc.gssd[2793]: WARNING: Failed to create krb5 context for user with uid 121 for server triangulum.ifm.liu.se
Note that there is still an error logged in the first line, but a different one. In the second line, the uid if the user changes from 0 (I'm logged in as root when doing both tests) to 121 (which is the uid of the user owning the home directory I'm trying to mount in both cases). Perhaps this is a clue, but I don't know what it tries to tell me.

The failing machine runs CentOS 5.5.

If I run the same command on one of the machines where mounting works I get the first line of output ("pinging") and nothing more. On the other hand I get a mounted directory.

I can't find any relevant differences in configuration. I've gone through files in /etc on a working and a non-working machine looking for changes but not finding anything relevant in /etc/sysconfig/nfs, /etc/hosts, /etc/idmapd.conf, /etc/krb5.conf, /etc/host.conf, /etc/nsswitch.conf, /etc/resolv.conf and others.

SELinux is not running.

This is what the keytab looks like on both working and non-working machines:
Code:
# klist -k -e
Keytab name: FILE:/etc/krb5.keytab
KVNO Principal
---- --------------------------------------------------------------------------
   3 host/pc13287.ad.ifm.liu.se@IFM.LIU.SE (DES cbc mode with RSA-MD5) 
   3 nfs/pc13287.ad.ifm.liu.se@IFM.LIU.SE (DES cbc mode with RSA-MD5)
I have an yp master and an yp slave, but there are both working and non-working clients connected to both of them.

There is plenty of space in /tmp and it is writable by all.

Among the total set of clients there are multiple versions of nfs-utils and kernel used, but I can pick a set of one working and one non-working that have the same versions for both (nfs-utils-1.0.9-47.el5_5 and kernel-2.6.18-194.17.1.el5).

Obviously, I need to check something else, but what? Please help!
 
  


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