Hi
I wrote a new RA that can manage a symlink.
Configuration:
primitive mylink ocf:heartbeat:symlink \
params link="/tmp/link" target="/tmp/target" \
op monitor interval="15" timeout="15"
This will basically
ln -s /tmp/target /tmp/link
hth
Dominik
#!/bin/bash
#
#
# An OCF RA that manages a symlink
#
# Copyright (c) 2011 Dominik Klein
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like. Any license provided herein, whether implied or
# otherwise, applies only to this software file. Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#######################################################################
# Initialization:
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/resource.d/heartbeat}
. ${OCF_FUNCTIONS_DIR}/.ocf-shellfuncs
#######################################################################
meta_data() {
cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="symlink">
<version>1.1</version>
<longdesc lang="en">
OCF Resource Agent that manages a symlink
You configure parameters link and target and the ra will basically do
ln -s target link
</longdesc>
<shortdesc lang="en">This resource agent manages a symlink</shortdesc>
<parameters>
<parameter name="link" required="1">
<longdesc lang="en">Full path of the symlink to be manged.</longdesc>
<shortdesc lang="en">Full path of the symlink</shortdesc>
<content type="string" default=""/>
</parameter>
<parameter name="target" required="1">
<longdesc lang="en">Full path to where the symlink should point.</longdesc>
<shortdesc lang="en">Full path to the link target</shortdesc>
<content type="string" default=""/>
</parameter>
</parameters>
<actions>
<action name="start" timeout="15" />
<action name="stop" timeout="15" />
<action name="monitor" depth="0" timeout="15" interval="60"/>
<action name="meta-data" timeout="5" />
<action name="validate-all" timeout="10" />
</actions>
</resource-agent>
END
}
symlink_monitor() {
rc=$OCF_NOT_RUNNING
if readlink -f $OCF_RESKEY_link | egrep -q "^${OCF_RESKEY_target}$"; then
rc=$OCF_SUCCESS
else
ocf_log debug "$OCF_RESKEY_link is not a link or does not point to
${OCF_RESKEY_target}"
fi
return $rc
}
symlink_start() {
if ! symlink_monitor; then
if ls $OCF_RESKEY_link &>/dev/null; then
ocf_log debug "Found $OCF_RESKEY_link, moving to
${OCF_RESKEY_link}.clusterbackup"
mv $OCF_RESKEY_link ${OCF_RESKEY_link}.clusterbackup
fi
ln -s $OCF_RESKEY_target $OCF_RESKEY_link
symlink_monitor
return $?
else
return $OCF_SUCCESS
fi
}
symlink_stop() {
if symlink_monitor; then
rm -f $OCF_RESKEY_link
if ! symlink_monitor; then
if [ -r ${OCF_RESKEY_link}.clusterbackup ]; then
ocf_log debug "Found backup ${OCF_RESKEY_link}.clusterbackup,
moving to $OCF_RESKEY_link"
mv ${OCF_RESKEY_link}.clusterbackup $OCF_RESKEY_link
fi
return $OCF_SUCCESS
else
ocf_log err "Removing $OCF_RESKEY_link failed."
return $OCF_ERR_GENERIC
fi
else
return $OCF_SUCCESS
fi
}
symlink_validate_all() {
if [ "x${OCF_RESKEY_link}" = "x" ]; then
ocf_log err "Mandatory parameter link is unset"
exit $OCF_ERR_CONFIGURED
fi
if [ "x${OCF_RESKEY_target}" = "x" ]; then
ocf_log err "Mandatory parameter target is unset"
exit $OCF_ERR_CONFIGURED
fi
}
symlink_usage() {
cat <<EOF
usage: $0 {start|stop|monitor|validate-all|meta-data}
Expects to have a fully populated OCF RA-compliant environment set.
EOF
}
if [ $# -ne 1 ]; then
symlink_usage
exit $OCF_ERR_ARGS
fi
case $__OCF_ACTION in
meta-data)
meta_data
exit $OCF_SUCCESS
;;
usage)
symlink_usage
exit $OCF_SUCCESS
esac
# Everything except usage and meta-data must pass the validate test
symlink_validate_all || exit
case $__OCF_ACTION in
start)
symlink_start
;;
stop)
symlink_stop
;;
status|monitor)
symlink_monitor
;;
validate-all)
;;
*)
symlink_usage
exit $OCF_ERR_UNIMPLEMENTED
esac
# exit code is the exit code (return code) of the last command (shell function)
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