Re: VE mutual dependence [message #34488 is a reply to message #34464] |
Mon, 12 January 2009 06:56 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) |
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curx
Messages: 739 Registered: February 2006 Location: Nürnberg, Germany
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Senior Member |
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you can use the OpenVZ Action script for a single dependecy mechanism, here using a mount script.
Checks if a container is running, if not, mount script exit with error code greater than 0 and vzctl start is aborted.
#!/bin/bash
# Copyright (C) 2006-2008 :
# Thorsten Schifferdecker <tsd@debian.systs.org>
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /usr/share/vzctl/scripts/vps.mount-10-ct-dependency.sh
# include main vz.conf
VZCONF=/etc/vz/vz.conf
[ -f ${VZCONF} ] || exit 0
. ${VZCONF}
# debug mode in main vz.conf set ?
[ "$DEBUG" == "yes" ] && set -x
# single dependency container id
CT_DEPEND="`awk -F '"' '/^CT_DEPEND/ { print $2 }' /etc/vz/conf/$VEID.conf`"
[ -f /etc/vz/conf/${CT_DEPEND}.conf ] || exit 0
[ $VEID -ne $CT_DEPEND ] || exit 0
# cycles to check
CHECK_CYCLE=10
# sleep time
SLEEP_TIME=5
LOG_MESSAGE="Container dependency"
__OK="is solved"
__FAILED="has failed"
#
# main
#
for i in ${CHECK_CYCLE} ; do
# started and running container has beancounters to avoid vzlist
if [ -d /proc/bc/${CT_DEPEND} ] ; then
[ $LOGGING == 'yes' ] && echo "`/bin/date +%FT%H:%M:%S%z` vzctl : CT ${VEID} : $LOG_MESSAGE to CT ${VEID} $__OK" >> $LOGFILE
printf "$LOG_MESSAGE to CT ${VEID} $__OK\n"
# add checking services, too
# include service checks
exit 0
fi
sleep $SLEEP_TIME
done
[ ${VERBOSE} -ne 0 ] && printf " to CT ${VEID} $__FAILED\n"
[ $LOGGING == 'yes' ] && printf "`/bin/date +%FT%H:%M:%S%z` vzctl : CT ${VEID} : Error $LOG_MESSAGE to CT ${VEID} $__FAILED\n" >> $LOGFILE
printf "$LOG_MESSAGE $__FAILED\n"
exit 1
save this script to /usr/share/vzctl/scripts/vps.mount-10-ct-dependency.sh and create a symbolic link :
global:
$ ln -s /usr/share/vzctl/scripts/vps.mount-10-ct-dependency.sh /etc/vz/conf/vps.mount
or for single container,m only:
$ ln -s /usr/share/vzctl/scripts/vps.mount-10-ct-dependency.sh /etc/vz/conf/<CTID>.mount
and activate check:
$ echo "CT_DEPEND=\"<CTID_DEPENDS_ON>\"" >> /etc/vz/conf/<CTID>.conf
Bye,
Thorsten
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