diff options
author | Soumya Koduri <skoduri@redhat.com> | 2016-03-14 16:36:33 +0530 |
---|---|---|
committer | Kaleb KEITHLEY <kkeithle@redhat.com> | 2016-03-21 03:51:28 -0700 |
commit | 3e5445ae7d1dbbcc138374b6d2e5f95ffc556f4b (patch) | |
tree | 45557aa07c03a65537a33dd369035519c98e2ef2 | |
parent | 46920e3bd38d9ae7c1910d0bd83eff309ab20c66 (diff) |
ganesha: Include a script to generate epoch value
In a NFS-Ganesha HA cluster setup, for NFS clients to recover state
succesfully post failover, the NFS-servers should start with a unique
epoch value.
With NFS-Ganesha 2.3, the service accepts an option "EPOCH_EXEC" which
takes path of the script, generating epoch value. This script is executed before
starting nfs-ganesha service so that the generated epoch value is used
while bringing up the service.
This patch includes the script to be used by nfs-ganesha+gluster setup.
The epoch value is computed as follows -
- first 32-bit contains the now() time
- rest 32-bit value contains the local glusterd node uuid
Change-Id: I876ea5a3730d7c6b40503e0fec16a4a142c54a36
BUG: 1317482
Signed-off-by: Soumya Koduri <skoduri@redhat.com>
Reviewed-on: http://review.gluster.org/13716
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
-rw-r--r-- | extras/ganesha/scripts/Makefile.am | 6 | ||||
-rwxr-xr-x | extras/ganesha/scripts/generate-epoch.py | 48 |
2 files changed, 52 insertions, 2 deletions
diff --git a/extras/ganesha/scripts/Makefile.am b/extras/ganesha/scripts/Makefile.am index e71e2f6456b..224ed26e75b 100644 --- a/extras/ganesha/scripts/Makefile.am +++ b/extras/ganesha/scripts/Makefile.am @@ -1,4 +1,6 @@ -EXTRA_DIST= ganesha-ha.sh dbus-send.sh create-export-ganesha.sh +EXTRA_DIST= ganesha-ha.sh dbus-send.sh create-export-ganesha.sh \ + generate-epoch.py scriptsdir = $(libexecdir)/ganesha -scripts_SCRIPTS = create-export-ganesha.sh dbus-send.sh ganesha-ha.sh +scripts_SCRIPTS = create-export-ganesha.sh dbus-send.sh ganesha-ha.sh \ + generate-epoch.py diff --git a/extras/ganesha/scripts/generate-epoch.py b/extras/ganesha/scripts/generate-epoch.py new file mode 100755 index 00000000000..5db5e56b480 --- /dev/null +++ b/extras/ganesha/scripts/generate-epoch.py @@ -0,0 +1,48 @@ +#!/usr/bin/python +# +# Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com> +# This file is part of GlusterFS. +# +# This file is licensed to you under your choice of the GNU Lesser +# General Public License, version 3 or any later version (LGPLv3 or +# later), or the GNU General Public License, version 2 (GPLv2), in all +# cases as published by the Free Software Foundation. +# +# Generates unique epoch value on each gluster node to be used by +# nfs-ganesha service on that node. +# +# Configure 'EPOCH_EXEC' option to this script path in +# '/etc/sysconfig/ganesha' file used by nfs-ganesha service. +# +# Construct epoch as follows - +# first 32-bit contains the now() time +# rest 32-bit value contains the local glusterd node uuid + +import time +import binascii + +# Calculate the now() time into a 64-bit integer value +def epoch_now(): + epoch_time = int(time.mktime(time.localtime())) << 32 + return epoch_time + +# Read glusterd UUID and extract first 32-bit of it +def epoch_uuid(): + file_name = '/var/lib/glusterd/glusterd.info' + + for line in open(file_name): + if "UUID" in line: + glusterd_uuid = line.split('=')[1].strip() + + uuid_bin = binascii.unhexlify(glusterd_uuid.replace("-","")) + + epoch_uuid = int(uuid_bin.encode('hex'), 32) & 0xFFFF0000 + return epoch_uuid + +# Construct epoch as follows - +# first 32-bit contains the now() time +# rest 32-bit value contains the local glusterd node uuid +epoch = (epoch_now() | epoch_uuid()) +print str(epoch) + +exit(0) |