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

[Robert P. J. Day]

Quoting Tom H <tomh0665 at gmail.com>:

> On Fri, Dec 20, 2013 at 2:34 PM, Robert P. J. Day  
> <rpjday at crashcourse.ca> wrote:
>>
>> a long, long time ago, i reported an apparent glitch with NFS on
>> fedora:
>>
>> https://lists.fedoraproject.org/pipermail/users/2010-January/097465.html
>>
>> in that, at the time, it *appeared* that you couldn't set up
>> NFS so that *only* version 4 was running. before i start messing
>> with this again, anyone know whether that's changed? that is,
>> is it possible to set up a network in which only NFSv4 is running,
>> and no earlier versions are supported? thanks.
>
> It's been possible to run nfsv4-only nfs for a long time, with only
> port 2049 being let through the firewall. It only appears that you
> can't because because rpc.mountd has to run on the server but it's
> only involved in the exporting and not the mounting.

   how does one configure fedora 20 to support only NFSv4? i'm used to
mucking with /etc/sysconfig/nfs in earlier versions of RH, and tweaking
the variables MOUNTD_NFS_V* and RPCNFSDARGS. i don't see those vars
in fedora 20 and, according to "rpcinfo -p", i'm currently supporting
NFS versions both 3 and 4. so how does one turn off NFSv3? thanks.

rday