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MQSeries.net Forum Index » IBM MQ Installation/Configuration Support » Script for ending qmgr in a clean way (for HA purposes)

Script for ending qmgr in a clean way (for HA purposes)

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eltehaem

Posted: Mon Apr 28, 2008 1:30 am Post subject: Script for ending qmgr in a clean way (for HA purposes)

Newbie

Joined: 24 Apr 2008
Posts: 1

Hi,

I've configured HA for MQ as described in "High-availability middleware on Linux" article (http://www.ibm.com/developerworks/linux/library/l-halinux2/). But I have an issue with this configuration. When I turn hearbeat off on primary node, it ends qmgr and than gives up shared disk. But I've noticed that not all MQ processes are ended:

Code:

mqm 7224 1 0 Apr24 ? 00:00:01 amqzxma0 -m QMGR
mqm 7225 7224 0 Apr24 ? 00:00:00 amqzxma0 -m QMGR
mqm 7227 7225 0 Apr24 ? 00:00:00 amqzxma0 -m QMGR
mqm 7229 7225 0 Apr24 ? 00:00:00 amqzxma0 -m QMGR
mqm 7230 7225 0 Apr24 ? 00:00:00 amqzxma0 -m QMGR
mqm 7236 7224 0 Apr24 ? 00:00:00 [amqhasmx] <defunct>
mqm 7240 7224 0 Apr24 ? 00:00:00 amqzllp0 -mQMGR ?
mqm 7241 7240 0 Apr24 ? 00:00:00 amqzllp0 -mQMGR ?
mqm 7243 7241 0 Apr24 ? 00:00:00 amqzllp0 -mQMGR ?
mqm 7244 7241 0 Apr24 ? 00:00:00 amqzllp0 -mQMGR ?
mqm 29584 1 0 10:06 ? 00:00:00 endmqm -w QMGR
mqm 29586 29584 0 10:06 ? 00:00:00 endmqm -w QMGR
mqm 29588 29586 0 10:06 ? 00:00:00 endmqm -w QMGR
mqm 29589 29586 0 10:06 ? 00:00:00 endmqm -w QMGR

And then, when I turn heartbeat on again, qmgr fails to start due to these hanging processes. I believe that the cause is in script which ends qmgr:

Code:

echo ending $qmgr
killproc runmqlsr
su - mqm -c "endmqm -i $qmgr &"
sleep 30

The script puts endmqm command in background and waits only thirty seconds. Then the script ends, and hearbeat gives up shared disk. But endmqm command didn't end during these thirty minutes, and hangs because it could not write anything to disk.

Could somebody tell me why author of the article did it this way? Why not use -w switch without putting command into background:

Code:

echo ending $qmgr
killproc runmqlsr
su - mqm "endmqm -w -i $qmgr"

What's the best way to end qmgr in a clean way, and to be assured that the script ends eventually in a limited time?

And why author used "killproc runmqlsr" instead of "endmqlsr"?

KramJ

Posted: Mon Apr 28, 2008 8:58 am Post subject:

Voyager

Joined: 09 Jan 2006
Posts: 80
Location: Atlanta

Here's what we do on our HACMP clusters:

# get queue manager name
qmgrname=`dspmq | awk -F$ {'print $2'} | awk -F$ {'print $1'}`

# stop sender channels
for i in `echo "dis chl(*) chltype(sdr)" | runmqsc $qmgrname| grep CHANNEL|grep -v SYSTEM| awk '{print $1}'`
do
echo "stop $i" | runmqsc
done

# stop receiver channels
for i in `echo "dis chl(*) chltype(rcvr)" | runmqsc $qmgrname| grep CHANNEL|grep -v SYSTEM| awk '{print $1}'`
do
echo "stop $i" | runmqsc $qmgrname
done

#
# Stop MQ processes
#
echo "running endmq"
echo "then sleeping 10 seconds"
endmqm -i $qmgrname
sleep 10

# Kill ipcs threads
ipcs | grep mqm | grep ^m | sed "s/m//g" | awk '{print$1}' > killme
for i in `cat killme `
do
ipcrm -m $i
done
rm killme

ipcs | grep mqm | grep ^s | sed "s/s//g" | awk '{print$1}' > killme
for i in `cat killme `
do
ipcrm -s $i
done
rm killme

exit 0

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