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| | [root@ovz-node1 ~]# chkconfig vz off | | [root@ovz-node1 ~]# chkconfig vz off |
| | [root@ovz-node1 ~]# | | [root@ovz-node1 ~]# |
| − | </pre>
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| − |
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| − | == Live-Switchover with the help of checkpointing ==
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| − |
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| − | With the help of [[Checkpointing_and_live_migration|checkpointing]] it is possible to do live switchovers.
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| − |
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| − | <b>Important:</b> although this HOWTO currently describes the use of DRBD 0.7, it is necessary to use DRBD 8 to be able to use this live-switchover feature reliable. Some hints on using OpenVZ Kernel 2.6.18 with DRBD 8 can be found in [http://forum.openvz.org/index.php?t=msg&th=3213&start=0& this thread in the forum].
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| − |
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| − | The following scripts are written by Thomas Kappelmueller. They should be placed at /root/live-switchover/ on both nodes. To activate the scripts execute the following commands on both nodes:
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| − | <pre>
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| − | [root@ovz-node1 ~]# ln -s /root/live-switchover/openvz /etc/init.d/
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| − | [root@ovz-node1 ~]# ln -s /root/live-switchover/live_switchover.sh /root/bin/
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| − | [root@ovz-node1 ~]#
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| − | </pre>
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| − |
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| − | It is also necessary to replace <code>vz</code> by an adjusted initscript (<code>openvz</code> in this example). So /etc/ha.d/haresources has the following content on both nodes:
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| − | <pre>
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| − | ovz-node1 drbddisk::r0 Filesystem::/dev/drbd0::/vz::ext3 openvz MailTo::youremail@yourdomain.tld
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| − | </pre>
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| − |
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| − | === Script cluster_freeze.sh ===
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| − | <pre>
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| − | #!/bin/bash
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| − | #Script by Thomas Kappelmueller
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| − | #Version 1.0
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| − | LIVESWITCH_PATH='/vz/cluster/liveswitch'
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| − |
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| − | if [ -f $LIVESWITCH_PATH ]
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| − | then
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| − | rm -f $LIVESWITCH_PATH
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| − | fi
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| − |
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| − | RUNNING_VE=$(vzlist -1)
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| − |
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| − | for I in $RUNNING_VE
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| − | do
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| − | BOOTLINE=$(cat /etc/sysconfig/vz-scripts/$I.conf | grep -i "^onboot")
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| − | if [ $I != 1 -a "$BOOTLINE" = "ONBOOT=\"yes\"" ]
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| − | then
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| − | vzctl chkpnt $I
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| − |
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| − | if [ $? -eq 0 ]
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| − | then
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| − | vzctl set $I --onboot no --save
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| − | echo $I >> $LIVESWITCH_PATH
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| − | fi
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| − | fi
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| − | done
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| − |
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| − | exit 0
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| − | </pre>
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| − |
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| − | === Script cluster_unfreeze.sh ===
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| − | <pre>
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| − | #!/bin/bash
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| − | #Script by Thomas Kappelmueller
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| − | #Version 1.0
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| − |
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| − | LIVESWITCH_PATH='/vz/cluster/liveswitch'
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| − |
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| − | if [ -f $LIVESWITCH_PATH ]
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| − | then
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| − | FROZEN_VE=$(cat $LIVESWITCH_PATH)
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| − | else
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| − | exit 1
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| − | fi
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| − |
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| − | for I in $FROZEN_VE
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| − | do
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| − | vzctl restore $I
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| − |
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| − | if [ $? != 0 ]
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| − | then
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| − | vzctl start $I
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| − | fi
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| − |
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| − | vzctl set $I --onboot yes --save
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| − | done
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| − |
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| − | rm -f $LIVESWITCH_PATH
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| − |
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| − | exit 0
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| − | </pre>
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| − |
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| − | === Script live_switchover.sh ===
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| − | <pre>
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| − | #!/bin/bash
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| − | #Script by Thomas Kappelmueller
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| − | #Version 1.0
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| − |
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| − | ps -eaf | grep 'vzctl enter' | grep -v 'grep' > /dev/null
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| − | if [ $? -eq 0 ]
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| − | then
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| − | echo 'vzctl enter is active. please finish before live switchover.'
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| − | exit 1
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| − | fi
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| − | ps -eaf | grep 'vzctl exec' | grep -v 'grep' > /dev/null
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| − | if [ $? -eq 0 ]
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| − | then
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| − | echo 'vzctl exec is active. please finish before live switchover.'
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| − | exit 1
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| − | fi
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| − | echo "Freezing VEs..."
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| − | /root/live-switchover/cluster_freeze.sh
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| − | echo "Starting Switchover..."
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| − | /usr/lib64/heartbeat/hb_standby
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| − | </pre>
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| − |
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| − | === Script openvz ===
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| − | <pre>
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| − | #!/bin/bash
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| − | #
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| − | # openvz Startup script for OpenVZ
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| − | #
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| − |
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| − | start() {
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| − | /etc/init.d/vz start > /dev/null 2>&1
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| − | RETVAL=$?
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| − | /root/live-switchover/cluster_unfreeze.sh
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| − | return $RETVAL
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| − | }
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| − | stop() {
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| − | /etc/init.d/vz stop > /dev/null 2>&1
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| − | RETVAL=$?
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| − | return $RETVAL
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| − | }
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| − | status() {
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| − | /etc/init.d/vz status > /dev/null 2>&1
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| − | RETVAL=$?
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| − | return $RETVAL
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| − | }
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| − |
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| − | # See how we were called.
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| − | case "$1" in
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| − | start)
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| − | start
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| − | ;;
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| − | stop)
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| − | stop
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| − | ;;
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| − | status)
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| − | status
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| − | ;;
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| − | *)
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| − | echo $"Usage: openvz {start|stop|status}"
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| − | exit 1
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| − | esac
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| − |
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| − | exit $RETVAL
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| | </pre> | | </pre> |
| | | | |
| | [[Category: HOWTO]] | | [[Category: HOWTO]] |
