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MQSeries.net Forum IndexGeneral IBM MQ SupportMQ LINUX leftover IPC resources

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krypton
PostPosted: Wed Aug 09, 2017 7:43 am Post subject: MQ LINUX leftover IPC resources Reply with quote

Centurion

Joined: 14 Mar 2010
Posts: 112

Hi,

we have 2 queue managers on our LINUX server and we have stopped both of them using normal "endmqm" command, we have also stopped listener using endmqlsr command, after that we ran the command amqiclen to clean up IPC resources and I am still seeing some IPC resources.
is that should be a cause of concern?

Following is the output of command
[mqm@hostname bin]$ ipcs -a

------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00039c05 23592996 mqm 666 8800 0
0x00039bfe 859799589 mqm 666 8800 0

------ Semaphore Arrays --------
key semid owner perms nsems
0x00000000 131074 mqm 660 1
0x00000000 163843 mqm 660 1
0x00000000 196612 mqm 666 8
0x00000000 294917 mqm 660 1
0x00000000 327686 mqm 666 8

------ Message Queues --------
key msqid owner perms used-bytes messages


********* Our MQ details ***
Name: WebSphere MQ
Version: 8.0.0.2
Level: p800-002-150217.2
BuildType: IKAP - (Production)
Platform: WebSphere MQ for Linux (x86-64 platform)
Mode: 64-bit
O/S: Linux 2.6.32-696.6.3.el6.x86_64
InstName: Installation1
InstDesc:
Primary: Yes
InstPath: /opt/mqm
DataPath: /var/mqm
MaxCmdLevel: 801
LicenseType: Production
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mqjeff
PostPosted: Wed Aug 09, 2017 7:53 am Post subject: Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17446

... Did you check for other MQ prcesses?

Also, you should probably configure the listener to be started and stopped by the queue manager, and review whether amiclen is still useful.
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krypton
PostPosted: Wed Aug 09, 2017 8:21 am Post subject: Reply with quote

Centurion

Joined: 14 Mar 2010
Posts: 112

Quote:
... Did you check for other MQ prcesses?


Yes, we didn't find any other "mq" processes were running after stopping queue manager.
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bruce2359
PostPosted: Wed Aug 09, 2017 10:08 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 7833
Location: US: west coast, almost. Otherwise, enroute.

Why are you using amqiclen?
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gbaddeley
PostPosted: Wed Aug 09, 2017 7:49 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1722
Location: Melbourne, Australia

It should only be necessary to try using amqiclen if a queue manager has crashed badly and fails to start, or another process has reused a PID that was formerly is use by a crashed amq process.
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Andyh
PostPosted: Thu Aug 10, 2017 4:19 am Post subject: Reply with quote

Centurion

Joined: 29 Jul 2010
Posts: 147

Correction, it should NEVER be required for a customer to use amqiclen directly. strmqm includes similar logic to amqiclen and will automatically clean up any left over IPC resources from an earlier instance of the same queue manager.
If strmqm chooses not to clean up such resources, because some process is still referencing those resources, then amqiclen shouldn't clean up those resources either. The test in strmqm/amqiclen is believed to be watertight in all supported situations.

There are ways that it would be possible to break this logic (for example by manually deleting certain queue manager related files), but none of those actions would be 'supported' by IBM.
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gbaddeley
PostPosted: Thu Aug 10, 2017 3:56 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1722
Location: Melbourne, Australia

Hi Andy, its good to hear that. I remember writing a script for MQ v5 that found and removed MQ's IPC resources, and then amqiclen came along in a later version. I have only used amqiclen in anger a couple of times over the last 5+ years, and that was on advice in an IBM PMR. MQ's handling of IPC resource cleanup has certainly improved a lot since the early days.
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krypton
PostPosted: Fri Aug 11, 2017 10:44 am Post subject: Reply with quote

Centurion

Joined: 14 Mar 2010
Posts: 112

Yes, IBM also say in this link that we should not perform Manual actions on IPC resources.
Then I guess, it was my bad to do this cleanup

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_7.0.1/com.ibm.mq.amqzag.doc/fa22720_.htm

IPC resources allocated by WebSphere MQ are maintained automatically by the allocating queue managers. You are strongly recommended not to perform manual actions on or remove these IPC resources.
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