nfs4 with kerberos troubles

Hi all,
I've been strugling to get NFS4 to work with my MIT Kerberos 5 infrastucture. I have a server and client with Centos 4.4. I'm using LDAP (Fedora Directory Server 1.4) for my POSIX accounts and KRB5 for the authentication. I am able to get the NFS mounts to work when kerberos is not enabled.

The error from the mount command # mount -t nfs4 -o sec=krb5 mynfsserver:/ /home/NFS4 is:
Warning: rpc.gssd appears not to be running.
mount: block device mynfsserver:/ is write-protected, mounting read-only
mount: cannot mount block device mynfsserver:/ read-only

When I run rpc.gssd -f vvvvvvv from the client, the error I'm seeing is:
WARNING: Failed to create krb5 context for user with uid 0 with any credentials cache for server mynfsserver.mydomain.com

On the server, in /var/log/messages:
mountd[2517]: mount request from unknown host myclientipaddress for /home/NFS4 (/home/NFS4)

I've got portmap, rpcidmapd, nfs, rpcgssd, and rpcsvcgssd services running on both client and server (but I'm not sure all are required on both).

I have created a host and nfs principal and have ktadded them to both the client and server:
#ktlist -k /etc/krb5.keytab
server:
nfs/[email protected]
host/[email protected]

client:
nfs/[email protected]
host/[email protected]

note: mydomain.com = MYREALM.COM (but realm is all uppercase)

I only found one other post referencing this, but it recommended the error be in the /etc/krb5.conf. I have:
.mydomain.com = MYREALM.COM
mydomain.com = MYREALM.COM
.mydomain.com = myrealm.com

I've also turned off nfslock and iptables services (latter for testing).

nfs server:
-----------
/etc/exports
/home/NFS4 gss/krb5(rw,fsid=0,insecure,no_subtree_check)

/etc/fstab:
/dev/VolGroup00/LogVol02 /home ext3 rw,acl 1 2

/etc/sysconfig/nfs
SECURE_NFS=yes
RPCNFSDCOUNT=8

/etc/idmapd.conf
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
Domain = mydomain.com
Nobody-User = nfsnobody
Nobody-Group = nfsnobody
Method = nsswitch

nfs client:
-----------
/etc/sysconfig/nfs
SECURE_NFS=yes
RPCNFSDCOUNT=8

/etc/idmapd.conf
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
Domain = mydomain.com
Nobody-User = nfsnobody
Nobody-Group = nfsnobody
Method = nsswitch

Can anyone please point me in the correct direction?

Many thanks!
Jonathan

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I think it may be a dns issue, but I'm not sure why you wouldn't see the error w/o Kerberos. What does your /etc/exports look like on the server? Can you do a reverse dns lookup of the client's IP from the server machine?

You don't want that last line. The first two are correct.

K.C.

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Sorry, I know you had the /etc/exports in the original message. I meant to remove that before sending the message :-/

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