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Old 07-31-2008, 07:29 PM   #1
Registered: Nov 2004
Location: Vancouver
Distribution: Ubunty, CentOS ,Mandriva, Gentoo, RedHat, Fedora, Knoppix
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NFS mounting problem

Hi guys,

I have two servers that are connected to my main network (call them Serv 1 and Serv 2). I have a client that's also connected to the same network (call it Client).

I bind a static IP to an existing interface on my primary server (Serv 1) and use that IP address to mount NFS shares by the client. I can read/write/modify and all with no problem.

But say the primary server (Serv1) fails to work and I have to switch to Serv 2. I take the Serv 1 offline and bind the same static IP address to serv 2 and start NFS on that. Although I can ping the serv2 from the client, I can't use the NFS shares (which are identical in every way to the shares on the serv 1). It just gets stuck when I try to access NFS shares on Serv2. Does anybody know what's wrong? Here's the ipcinfor -p output from serv2 that I thought might be useful:

root /home/alireza Localhost# rpcinfo -p

program vers proto port

100000 2 tcp 111 portmapper

100000 2 udp 111 portmapper

100003 2 udp 2049 nfs

100003 3 udp 2049 nfs

100021 1 udp 32790 nlockmgr

100021 3 udp 32790 nlockmgr

100021 4 udp 32790 nlockmgr

100003 2 tcp 2049 nfs

100003 3 tcp 2049 nfs

100021 1 tcp 48599 nlockmgr

100021 3 tcp 48599 nlockmgr

100021 4 tcp 48599 nlockmgr

100005 1 udp 855 mountd

100005 1 tcp 858 mountd

100005 2 udp 855 mountd

100005 2 tcp 858 mountd

100005 3 udp 855 mountd

100005 3 tcp 858 mountd

root /home/alireza Localhost# service nfs status

rpc.mountd (pid 17639) is running...

nfsd (pid 17635 17634 17633 17632 17631 17630 17629 17628) is running...

Thanks !
Old 07-31-2008, 11:36 PM   #2
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My crystal ball is cracked so everything is fuzzy! So to SWAG;

You should check your '/etc/hosts', '/etc/hosts.allow', and '/etc/hosts.deny'. Don't forget your '/etc/exports' file. Whenever you want to change be sure to update the exportfs.

excerpt from 'man exportfs';
       exportfs - maintain list of NFS exported file systems

       /usr/sbin/exportfs [-avi] [-o options,..] [client:/path ..]
       /usr/sbin/exportfs -r [-v]
       /usr/sbin/exportfs [-av] -u [client:/path ..]
       /usr/sbin/exportfs [-v]
       /usr/sbin/exportfs -f

       The  exportfs command is used to maintain the current table of exported
       file systems for NFS. This list  is  kept  in  a  separate  file  named
       /var/lib/nfs/xtab  which  is read by mountd when a remote host requests
       access to mount a file tree, and parts of the list which are active are
       kept in the kernel's export table.

       Normally  this  xtab file is initialized with the list of all file sys-
       tems named in /etc/exports by invoking exportfs -a.
Old 08-01-2008, 12:46 AM   #3
Registered: Jan 2007
Location: INDIA
Distribution: Ubuntu, Debian
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run exportfs -rv
Old 08-01-2008, 12:59 AM   #4
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Registered: Nov 2006
Location: Belgium
Distribution: Ubuntu 11.04, Debian testing
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Try showmount on the server, to see what is going on.


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