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NFS Share Not Mounting On Debian Client From Centos NFS Server

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  NFS Share Not Mounting On Debian Client From Centos NFS Server Nrth <nrth@invalid.example> - 2012-08-15 17:33 +0100
    Re: NFS Share Not Mounting On Debian Client From Centos NFS Server J G Miller <miller@yoyo.ORG> - 2012-08-15 19:17 +0000
      Re: NFS Share Not Mounting On Debian Client From Centos NFS Server Nrth <nrth@invalid.example> - 2012-08-15 22:31 +0100

#1585 — NFS Share Not Mounting On Debian Client From Centos NFS Server

Hello,

I appear to be having some problems with what many of you may consider to 
be a fairly trivial matter (I know I did at first). I have a Centos 6.3 
NFS server that happily hands out shares to other Centos 6.3 NFS clients 
but due to some configuration mistake I've made I can't mount the same 
(one and only) share on a Debian Squeeze NFS client.

I would be most grateful if any kind soul/s would put an end to further 
hair loss and wood-for-the-trees-ness that has consumed much of my 
afternoon today. As an aside, I'm an X-Files fan which is just about to 
become apparent to many.

On the Centos 6.3 x86_64 server in /etc/exports :

/home/pete/     doggett.nrth.lab(rw,no_root_squash)

The NFS-related services running on this server all appear in order in 
that I have rpc.statd, rpc.mountd and rpcbind all correct and present.

On the Debian Squeeze amd64 client I have rpcbind and rpc.statd running. 
I've tried modifying /etc/default/nfs-common on the Debian client to 
include the following line :

NEED_IDMAPD=yes

 .. as I believe the NFS server on the Centos box is running that 
version. (As it turns out, it doesn't matter whether I have that option 
enabled or not, I still cannot browse to the mounted share using 
Nautilus.)

On the Debian Squeeze amd64 client I run this command :

mount -t nfs tooms.nrth.lab:/home/pete /home/pete/serverdocs

There is no error shown and I get an HD icon on my desktop, but if I try 
to navigate into this share using Nautilus, I receive an access denied 
message stating possible reasons for this error as lack of permissions. 
Fair enough, but I can't see what to change.

Despite the above error, I can access the mounted share as root on the 
Debian client and modify files. However, I cannot even change into that 
directory as user 'pete' on the Debian client.

The only possible cause I can think of is UIDs that are different and not 
being mapped. For example, on the server the user 'pete' has a UID and GID 
of 500 whereas on the client the same account has 1000.

Any help or information would be gratefully received.


Regards,

Pete.





 

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#1586

On Wednesday, August 15th, 2012, at 17:33:10h +0100, Nrth explained:

> I have a Centos 6.3 NFS server that happily hands out shares to
> other Centos 6.3 NFS clients 

You have failed to state which version of NFS you are running
on the Centos systems and the Debian system.

Is it NFS v3 or v4?

> I've tried modifying /etc/default/nfs-common on the Debian client to 
> include the following line :
> 
> NEED_IDMAPD=yes

You only need IDMAPD for NFS v4.

If you are running NFS v3 then you need rpc.stad running.

>  .. as I believe the NFS server on the Centos box is running that
> version. 

Which version?

If you are running NFS v4 with idmapd, then you should also
examine the configuration file /etc/idmapd.conf

Also take a look at 

     <https://help.ubuntu.com/community/NFSv4Howto>

because the way that directories are exported with NFSv4 is done
in a hierarchy in /etc/exports rather different to the way
NFSv3 is configure.

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#1589

On Wed, 15 Aug 2012 19:17:20 +0000, J G Miller <miller@yoyo.ORG> wrote:

> On Wednesday, August 15th, 2012, at 17:33:10h +0100, Nrth explained:
> 
>> I have a Centos 6.3 NFS server that happily hands out shares to other
>> Centos 6.3 NFS clients
> 
> You have failed to state which version of NFS you are running on the
> Centos systems and the Debian system.
> 
> Is it NFS v3 or v4?

Hello,

Thanks for the reply and sorry for various omissions. I believe the 
server is NFSv4. The (Debian) client I'm not so sure about as it appears 
to be able to talk all three versions. By the way, there are no firewalls 
active between these two machines.

After checking your supplied URL and digging a little deeper, I found 
with which I'm happy although it may not be to everyone's taste.

First of all, the /etc/exports line as it stands now.

/home/pete/     doggett.nrth.lab(rw)

I've removed 'no_root_squash' and indeed root on the client cannot access 
the mounted NFS share, neither can any other user which was as expected 
so that'll do for now.

Any other user that is, apart from myself. I found this very useful page 
and within was the solution which I found most suitable.

http://www.troubleshooters.com/linux/
nfs.htm#_Mounting_an_NFS_Share_on_a_Client


The solution (for me) was to change the UID and GID of my user account on 
the Debian box to match that of the server's record of the same username. 
So 'pete' on both boxes is now '500' in /etc/passwd and /etc/group. A 
quick chown -R pete:pete /home/pete and a (reflex) reboot and the 
following mount command worked as before but this time I was able to 
access the share.

mount -t nfs4 tooms.nrth.lab:/home/pete /home/pete/serverdocs

Thanks again for the reply and for the motivation.

Regards,

Pete.

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