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MQSeries.net Forum IndexGeneral IBM MQ Supportscript before qmgr start

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paustin_ours
PostPosted: Wed Oct 30, 2019 11:10 am Post subject: script before qmgr start Reply with quote

Yatiri

Joined: 19 May 2004
Posts: 632
Location: columbus,oh

Is there a way to call a script before a queue manager starts?

would like to implement multi instance queue managers but need to have a script run on a server the qmgr switches over to and before the queue manager starts. Similarly if it fails on the running server, before switching i would like a dscript run on the current server before switching and also on the new server before qmgr starts up. Is this possible?
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bruce2359
PostPosted: Wed Oct 30, 2019 11:26 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8534
Location: US: west coast, almost. Otherwise, enroute.

Yes, you can issue 'strmqm' command from a script.
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PeterPotkay
PostPosted: Wed Oct 30, 2019 4:50 pm Post subject: Reply with quote

Poobah

Joined: 15 May 2001
Posts: 7582

Internal MQ processes are deciding when to switch a multi instance QM from one node to another when there is an unplanned reason to fail over. The unplanned failover occurs without anyone calling strmqm. I don't know how you would guarantee your script ran before this automated outside-of-your-control failover occurred.

What does your script do?
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HubertKleinmanns
PostPosted: Thu Oct 31, 2019 1:18 am Post subject: Re: script before qmgr start Reply with quote

Shaman

Joined: 24 Feb 2004
Posts: 724
Location: Germany

paustin_ours wrote:
Is there a way to call a script before a queue manager starts?

would like to implement multi instance queue managers but need to have a script run on a server the qmgr switches over to and before the queue manager starts. Similarly if it fails on the running server, before switching i would like a dscript run on the current server before switching and also on the new server before qmgr starts up. Is this possible?


This normally is called HA (e. g. PowerHA for AIX).
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fjb_saper
PostPosted: Thu Oct 31, 2019 8:52 pm Post subject: Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20138
Location: LI,NY

Have you looked at running it as a queue manager service, starting at queue manager start and setting a different script for qmgr shutdown / service shutdown...
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HubertKleinmanns
PostPosted: Thu Oct 31, 2019 11:45 pm Post subject: Reply with quote

Shaman

Joined: 24 Feb 2004
Posts: 724
Location: Germany

First question: Which platform ?

Second question: What shall your script do (Peter asked this already)?

MQ controls the take-over of a multi-instance QMgr by checking some file locks - no script is involved. As soon as the standby-instance recognizes an unlocking of this file, it starts the QMgr. No chance to put a script into the flow.

But may be you could create a MQ service object of type COMMAND, which runs your script, like this:
Code:
DEFINE SERVICE('<your_name>') SERVTYPE(COMMAND) +
   CONTROL(STARTONLY) STARTCMD('<your_script>') +
   STARTARG('<script_args>') STDOUT('...') STDERR('...')


This script wouldn't run before the QMgr starts, but immediately after the QMgr came up.

If you have to check some things, before the QMgr is started, you cannot use multi-instance QMgrs. In this case you have to use HA (or some own scripts around, which nearly do the same).
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