mount -t nfs4 fails w/ permission denied; how to debug? (FC3)

[Neal Becker]

Will Partain wrote:

> In a test setup with FC3 client and server, I can successfully
> 
>    sudo mount -t nfs albus:/._disc1/sysadm/test1 /mnt/test1
> 
> (getting an nfs v3 mount).  If I instead...
> 
>    sudo mount -t nfs4 albus:/._disc1/sysadm/test1 /mnt/test1
> 
> ... I get "mount: permission denied".  Nothing appears in the logs of
> either machine (well, one uninteresting SELinux message; SELinux is
> not enforced on either machine).  I believe that bits are getting to
> the server: certainly running ethereal against port 2049 on the server
> shows chit-chat at the expected time.  This is without Kerberos,
> i.e. it should be doing sec=unix.
> 
> So the question: how can I get something to tell me more about what's
> going on?  Thanks,
> 
> Will
> 
> PS: Ideally, I would like for an FC3+ server to dish out nfsv4 to FC3+
> clients, and nfsv3 to less capable ones.  Plausible?
> 

On the server side you need fsid=0

e.g.: (rw,async,fsid=0,insecure,no_subtree_check) 
in /etc/exports

I found that out by luck - it's not clearly documented.