Looks like an issue with the agent.  Re-assigning.

Jaroslav,

Do you know what version of resource-agents you had installed?  Was is just what was included in 6.2?  I'm having trouble getting things into /var/lib/nfs/rmtab can you also let me know what kernel you're using as well?

Thanks!
Chris

If I remember correctly, it was 6.2 GA, same applies for the kernel.

I was facing the same problem in a failover cluster implementation based on RHEL 6.2 and using the following packages:

pacemaker-libs-1.1.6-3.el6.x86_64
pacemaker-cluster-libs-1.1.6-3.el6.x86_64
pacemaker-1.1.6-3.el6.x86_64
pacemaker-cli-1.1.6-3.el6.x86_64

corosync-1.4.1-4.el6_2.2.x86_64
corosynclib-1.4.1-4.el6_2.2.x86_64

heartbeat-libs-3.0.4-1.el6.x86_64
heartbeat-3.0.4-1.el6.x86_64

I've fixed the problem changing the script /usr/lib/ocf/resource.d/heartbeat/exportfs, and inserting the following two lines of code:

grep -v ":${OCF_RESKEY_directory}:" /var/lib/nfs/rmtab > /var/lib/nfs/rmtab.tmp
mv   -f /var/lib/nfs/rmtab.tmp /var/lib/nfs/rmtab

The two lines above are inserted before the following line:

cat  ${rmtab_backup} >> /var/lib/nfs/rmtab

This issue has been resolved in the latest resource-agents build.  The upstream patch related to this issue can be found here.

https://github.com/ClusterLabs/resource-agents/commit/bbc90e9de8636609842fb01219e8d9c789d8a623

This has been fixed as a result of the heartbeat agent refresh.

I have verified that the /var/lib/nfs/rmtab file size does not grow
exponentially with the patched version of resource-agents-3.9.2-40.el6.x86_64
after moving the nfs server 10 times.


setup of the cluster and resources is as follows:

---------
virt-021# pcs status
Cluster name: STSRHTS11429
Last updated: Tue Oct 15 11:42:28 2013
Last change: Tue Oct 15 11:36:21 2013 via cibadmin on virt-022
Stack: cman
Current DC: virt-022 - partition with quorum
Version: 1.1.10-14.el6-368c726
3 Nodes configured
7 Resources configured

Online: [ virt-020 virt-021 virt-022 ]

Full list of resources:
 virt-fencing   (stonith:fence_xvm):    Started virt-020 
 Resource Group: ha-nfsserver
     vip        (ocf::heartbeat:IPaddr2):       Started virt-021 
     nfs-server (ocf::heartbeat:nfsserver):     Started virt-021 
     nfs-export (ocf::heartbeat:exportfs):      Started virt-021 
 Clone Set: nfs-shared-fs-clone [nfs-shared-fs]
     Started: [ virt-020 virt-021 virt-022 ]
---------
virt-021# pcs resource show vip nfs-server nfs-export nfs-shared-fs-clone
 Resource: vip (class=ocf provider=heartbeat type=IPaddr2)
  Attributes: ip=10.34.70.217 cidr_netmask=23 
  Operations: monitor interval=30s (vip-monitor-interval-30s)

 Resource: nfs-server (class=ocf provider=heartbeat type=nfsserver)
  Attributes: nfs_ip=10.34.70.217 nfs_init_script=/etc/init.d/nfs \
nfs_shared_infodir=/mnt/nfs nfs_notify_cmd=/usr/sbin/sm-notify 
  Operations: monitor interval=30s (nfs-server-monitor-interval-30s)

 Resource: nfs-export (class=ocf provider=heartbeat type=exportfs)
  Attributes: directory=/mnt clientspec=* options=rw,async,no_all_squash fsid=238 
  Operations: monitor interval=60s (nfs-export-monitor-interval-60s)
 Clone: nfs-shared-fs-clone

 Resource: nfs-shared-fs (class=ocf provider=heartbeat type=Filesystem)
   Attributes: device=/dev/sda directory=/mnt fstype=gfs2 options= 
   Operations: monitor interval=30s (nfs-shared-fs-monitor-interval-30s)
---------
virt-021# ls -l /var/lib/nfs/rmtab
-rw-r-----. 1 root root 0 Oct 15 11:42 /var/lib/nfs/rmtab

mounted nfs share from outside of the cluster with this command:
# mount 10.34.70.217:/mnt /exports -o nfsvers=3

---------
virt-021# ls -l /var/lib/nfs/rmtab
-rw-r-----. 1 root root 27 Oct 15 11:45 /var/lib/nfs/rmtab


WITHOUT A PATCH (resource-agents-3.9.2-22.el6.x86_64):
======================================================
virt-021# grep -A 12 'restore_rmtab()' \
    /usr/lib/ocf/resource.d/heartbeat/exportfs 
restore_rmtab() {
    local rmtab_backup
    if [ ${OCF_RESKEY_rmtab_backup} != "none" ]; then
        rmtab_backup="${OCF_RESKEY_directory}/${OCF_RESKEY_rmtab_backup}"
        if [ -r ${rmtab_backup} ]; then
            cat  ${rmtab_backup} >> /var/lib/nfs/rmtab
            ocf_log debug "Restored `wc -l ${rmtab_backup}` rmtab entries from ${rmtab_backup}."
        else
            ocf_log warn "rmtab backup ${rmtab_backup} not found or not readable."
        fi
    fi
}

virt-021# for a in $(seq 1 5); do \
pcs resource move ha-nfsserver; sleep 5; \
pcs resource move ha-nfsserver; sleep 5; \
pcs constraint remove $(pcs constraint ref ha-nfsserver | grep cli); echo $a;\
done

virt-021# ls -l /var/lib/nfs/rmtab 
-rw-r-----. 1 root root 182655 Oct 15 12:42 /var/lib/nfs/rmtab


PATCHED VERSION (resource-agents-3.9.2-40.el6.x86_64)
=====================================================
virt-021#  grep -A 12 'restore_rmtab()' \
>     /usr/lib/ocf/resource.d/heartbeat/exportfs 
restore_rmtab() {
    local rmtab_backup
    if [ ${OCF_RESKEY_rmtab_backup} != "none" ]; then
        rmtab_backup="${OCF_RESKEY_directory}/${OCF_RESKEY_rmtab_backup}"
        if [ -r ${rmtab_backup} ]; then
            local tmpf=`mktemp`
            sort -u ${rmtab_backup} /var/lib/nfs/rmtab > $tmpf &&
                install -o root -m 644 $tmpf /var/lib/nfs/rmtab
            rm -f $tmpf
            ocf_log debug "Restored `wc -l ${rmtab_backup}` rmtab entries from ${rmtab_backup}."
        else
            ocf_log warn "rmtab backup ${rmtab_backup} not found or not readable."
        fi

virt-021# for a in $(seq 1 5); do \
pcs resource move ha-nfsserver; sleep 5; \
pcs resource move ha-nfsserver; sleep 5; \
pcs constraint remove $(pcs constraint ref ha-nfsserver | grep cli); echo $a;\
done

virt-021# ls -l /var/lib/nfs/rmtab
-rw-r--r--. 1 root root 27 Oct 15 12:58 /var/lib/nfs/rmtab

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1541.html