[ClusterLabs] Rhel 7.2 pacemaker Cluster - gfs2 over nfs

Dawood Munavar S M dawood.m at msystechnologies.com
Mon May 1 10:16:29 EDT 2017


Could you please share any links/steps to create NFS HA cluster over gfs2
file system using Pacemaker. Currently I have completed till mounting of
gfs2 file systems on cluster nodes and now I need to create cluster
resources for NFS server, exports and mount on client.

I followed some RedHat forums and created NFS cluster resources but still
"showmount -e" doesn't list the export entries,

*[root at node1-emulex ~]# pcs status*
Cluster name: mycluster
Stack: corosync
Current DC: node2-atto (version 1.1.15-11.el7_3.4-e174ec8) - partition with
Last updated: Mon May  1 09:55:47 2017          Last change: Mon May  1
07:50:25 2017 by root via cibadmin on node1-emulex

2 nodes and 10 resources configured

Online: [ node1-emulex node2-atto ]

Full list of resources:

 scsi   (stonith:fence_scsi):   Started node2-atto
 Clone Set: dlm-clone [dlm]
     Started: [ node1-emulex node2-atto ]
 Clone Set: clvmd-clone [clvmd]
     Started: [ node1-emulex node2-atto ]
 Clone Set: clusterfs-clone [clusterfs]
     Started: [ node1-emulex node2-atto ]
 ClusterIP      (ocf::heartbeat:IPaddr2):       Started node1-emulex
 NFS-D  (ocf::heartbeat:nfsserver):     Started node1-emulex
 nfs-cm-shared  (ocf::heartbeat:exportfs):      Started node2-atto

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled
[root at node1-emulex ~]#
[root at node1-emulex ~]# showmount -e
Export list for
[root at node1-emulex ~]#

*Note:* Below steps are followed to create nfs resources after mounting
gfs2 file systems on cluster nodes

1. pcs resource create ClusterIP ocf:heartbeat:IPaddr2 ip=
cidr_netmask=19 op monitor interval=30s
2. pcs resource create NFS-D nfsserver
3. pcs resource create nfs-cm-shared exportfs clientspec=
55.224.0 <> options=rw,sync,no_root_squash
directory=/mnt/pacemaker/exports fsid=0
4. Added resource dependancies
5. [root at node2-atto ~]# showmount -e
Export list for <>:
**** No Entries *****

*[root at node1-emulex ~]# pcs status resources clusterfs-clone*
 Clone: clusterfs-clone
  Meta Attrs: interleave=true
  Resource: clusterfs (class=ocf provider=heartbeat type=Filesystem)
   Attributes: device=/dev/volgroup/vol directory=/mnt/pacemaker/
fstype=gfs2 options=noatime,localflocks
   Operations: start interval=0s timeout=60 (clusterfs-start-interval-0s)
               stop interval=0s timeout=60 (clusterfs-stop-interval-0s)
               monitor interval=10s on-fail=fence
[root at node1-emulex ~]#
*[root at node1-emulex ~]# pcs status resources ClusterIP*
 Resource: ClusterIP (class=ocf provider=heartbeat type=IPaddr2)
  Attributes: ip= cidr_netmask=19
  Operations: start interval=0s timeout=20s (ClusterIP-start-interval-0s)
              stop interval=0s timeout=20s (ClusterIP-stop-interval-0s)
              monitor interval=30s (ClusterIP-monitor-interval-30s)
[root at node1-emulex ~]#
*[root at node1-emulex ~]# pcs status resources NFS-D*
 Resource: NFS-D (class=ocf provider=heartbeat type=nfsserver)
  Attributes: nfs_shared_infodir=/mnt/pacemaker/nfsinfo nfs_ip=
  Operations: start interval=0s timeout=40 (NFS-D-start-interval-0s)
              stop interval=0s timeout=20s (NFS-D-stop-interval-0s)
              monitor interval=10 timeout=20s (NFS-D-monitor-interval-10)
[root at node1-emulex ~]#
*[root at node1-emulex ~]# pcs status resources nfs-cm-shared*
 Resource: nfs-cm-shared (class=ocf provider=heartbeat type=exportfs)
  Attributes: clientspec=
options=rw,sync,no_root_squash directory=/mnt/pacemaker/exports fsid=0
  Operations: start interval=0s timeout=40 (nfs-cm-shared-start-interval-0s)
              stop interval=0s timeout=120 (nfs-cm-shared-stop-interval-0s)
              monitor interval=10 timeout=20 (nfs-cm-shared-monitor-

*Query:*  I went through RedHat forums and it is mentioned that Exporting a
GFS2 filesystem in an Active/Active configuration is only supported when
using *Samba+CTDB* to export the GFS2 filesystem. Please let us know if its
mandatory to configure CTDB when nfs over gfs2 is configured or anyother
options is available.





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