can you (theoretically) run only NFSv4 (without earlier versions)?

Ed Greshko Ed.Greshko at
Tue Dec 24 13:38:48 UTC 2013

On 12/24/13 21:24, Robert P. J. Day wrote:
>   just to explain where this all came from, i was working off of what
> i was seeing on a RHEL (actually CentOS) 6.5 system, where the config
> file /etc/sysconfig/nfs had helpful comments which allowed me to
> tweak that file thusly:
> # Define which protocol versions mountd
> # will advertise. The values are "no" or "yes"
> # with yes being the default
> MOUNTD_NFS_V2="no"
> MOUNTD_NFS_V3="no"
> ... snip ...
> # Optional arguments passed to rpc.nfsd. See rpc.nfsd(8)
> # Turn off v2 and v3 protocol support
>   if i make the above changes and restart NFS (on the RHEL system),
> the *only* NFS-related entries i see in the output of "rpcinfo -p" are:
>     100003    4   tcp   2049  nfs
>     100003    4   udp   2049  nfs
> and that's *it*, nothing more, which is what i expected.
>   sadly, i don't have access to my fedora 20 box at the moment,
> but all i was doing was trying to produce the same result --
> only those two lines in the output of "rpcinfo -p". i can see
> that the *effect* of the earlier suggestions is the same, in
> that only NFSv4 is supported, but there is still that crud in
> the output of "rpcinfo -p" that seems irrelevant.
>   oh, and on the RHEL 6.5 system, the contents of the file
> /proc/fs/nfsd/versions correctly contains:
> -2 -3 +4 -4.1 


In any event, I think the original question has been answered.  Yes, you can configure nfs on Fedora to allow only NFSv4.   Agreed?

Getting tired of non-Fedora discussions and self-serving posts
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