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MQSeries.net Forum IndexIBM MQ Java / JMSConnecting to multiple MQ Queue Managers using CCDT

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mca
PostPosted: Sun Apr 01, 2018 6:18 pm Post subject: Connecting to multiple MQ Queue Managers using CCDT Reply with quote

Disciple

Joined: 09 Mar 2005
Posts: 178

We have a new project requirement for the JMS application to connect to multiple Queue Managers (two QMs) to provide load balancing and high availability. We tried putting F5 load balancer in front of MQ, but that did not solve the purpose. We are asked to setup CCDT.

We have two Queue managers hosted on different Linux servers containing the SVRCONN channels that the JMS application on another Linux server is connecting to.

The JMS application team is asking us to copy the CCDT file to their client machine location. But we have two CCDT files from two separate Queue Managers. Upon doing some reading last few days, realized the way to address this is to create Queue Manager Group but the documentation is not basic enough for me to understand how to do this.

Can someone help me out by providing solution on how to do this (provide application team CCDT file info containing two QM connections) or any detailed documentation helps.
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fjb_saper
PostPosted: Mon Apr 02, 2018 4:15 am Post subject: Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19705
Location: LI,NY

The documentation is in the manual.
Basically you define 2 svrconn channels (with unique names), one on each qmgr. You then define the corresponding clntconn channel and give both channels the same qmname. You connect using the ccdt and '*qmname'.
Have fun
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mca
PostPosted: Mon Apr 02, 2018 7:53 am Post subject: Reply with quote

Disciple

Joined: 09 Mar 2005
Posts: 178

The documentation is confusing but your reply sounds simple and promising.

I have two Queue Managers defined that the JMS application connects using bindings...

OMSQM1
OMSQM2

Defined one SVRCONN on each Queue Manager

SVRCONN1 on OMSQM1
SVRCONN2 on OMSQM2

I am lost after this...
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fjb_saper
PostPosted: Tue Apr 03, 2018 8:20 pm Post subject: Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19705
Location: LI,NY

mca wrote:
The documentation is confusing but your reply sounds simple and promising.

I have two Queue Managers defined that the JMS application connects using bindings...

OMSQM1
OMSQM2

Defined one SVRCONN on each Queue Manager

SVRCONN1 on OMSQM1
SVRCONN2 on OMSQM2

I am lost after this...

Now define your clntconn channels (either on the same qmgr or without a qmgr just referencing the CCDT)
One clntconn channel for SVRCONN1 with CONNAME(xxx) QMNAME OMSQM
One clntconn channel for SVRCONN2 with CONNAME(yyy) QMNAME OMSQM
These will go into your CCDT.

Connect using the CCDT URL and *OMSQM as queue manager name.

Have fun
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MQMB&WAS
PostPosted: Tue Apr 10, 2018 10:12 am Post subject: Reply with quote

Voyager

Joined: 12 Jun 2016
Posts: 86

With this configuration, does the app connect to the 2 qmgrs concurrently? or to only 1 qmgr based on availability ?
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exerk
PostPosted: Tue Apr 10, 2018 11:26 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5876

THIS ARTICLE expands on fjb_saper's answer, as does THIS ONE.
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