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

Ed Greshko Ed.Greshko at greshko.com
Tue Dec 24 00:44:32 UTC 2013


On 12/24/13 08:15, Robert P. J. Day wrote:
> Quoting Ed Greshko <Ed.Greshko at greshko.com>:
>
>> On 12/24/13 07:16, Robert P. J. Day wrote:
>>> 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.
>>>
>>>
>>
>> In /etc/sysconfig/nfs
>>
>> # Optional arguments passed to rpc.nfsd. See rpc.nfsd(8)
>> RPCNFSDARGS=""
>>
>> man 8 rpc.nfsd
>>
>>       -N  or  --no-nfs-version vers
>>               This option can be used to request that rpc.nfsd does  not  offer
>>               certain versions of NFS. The current version of rpc.nfsd can sup‐
>>               port NFS versions 2,3,4 and the newer version 4.1.
>>
>> Would seem to be what you are searching.
>
>   i tried that and it didn't seem to work, in the sense that when i
> ran "rpcinfo -p" to verify the result, here's part of the output:
>
>     100003    3   tcp   2049  nfs
>     100227    3   tcp   2049  nfs_acl
>     100003    3   udp   2049  nfs
>     100227    3   udp   2049  nfs_acl
>     100003    4   tcp   2049  nfs
>     100003    4   udp   2049  nfs
>
> so isn't that telling me i still have both versions 3 and 4? here's
> the line i added to the file:
>
> RPCNFSDARGS="-N 2 -N 3"
>

Port 2049 is used by V4.  I don't think V3 or V2 uses it....

I would add to the parameters -U to disable UDP and then attempt a mount while specifying that nfs version 3 be used.  That will verify it.


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


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