Requirement : To set up a minimal steps for a Two Way MQ communication between two queue managers ie From QMA to QMB & From QMB to QMC
Reference Links :
1) Distributed MQ communication Part 1
2) Distributed Two Way MQ Communication — Part2
Passing the messages between more than one intermediate queue managers is called Multi-Hopping. Multi-hopping occurs when a message needs to traverse one or more queue-managers in order to reach the destination queue-manager.
The Setup in which a QMGR is networked with the next QMGR which is networked to the next QMGR ie (QMA -> QMB -> QMC -> QMD -> QME).
If a message is created on QMA, and the destination queue-manager is on QME, then the message must flow from QMB to QMC, to QMD to QME.
QMB and QMC will need a queue-manager aliases since they are non-adjacent (don’t have a transmission queue) to the destination queue-manager.
QMB needs a definition to move the message from QMB to the next hop QMC. and so on
So, when the message arrives on QMB, a queue-manager alias must exist to resolve the queue-manager name in the XQH (transmission queue header):
DEF QR(QME) RQMname(QME) XMITQ(QMC).
This definition tells the MCA (message channel agent) on QMB to move the message to transmission queue named QMC, so that the message will be sent to QMC.
When the message arrives on QMC, again a queue-manager alias will be need to be defined to move the message to a transmission queue named QMD:
DEF QR(QME) RQMname(QME) XMITQ(QMD).
So QMA doesn’t know any thing about QME so by defining the QM alias the message is reached to the destination QME.
The only thing and the only route that QMA knows is how to get to QMB. Everything else is resolved at QMB. So as long as QMB is *secured*, then no application can send messages to QMC without going through QMB
Env Architecture :
OS : Linux Redhat 5.6
MQ Version : 7.0
Quick Reference Commands for Multi Hopping with 3 QMGRS
On Queue Manager QMA
On Queue Manager QMB
— Qmgr Alias needs to be set in the QMB
DEFINE QREMOTE(QMC) RQMNAME(QMC) RNAME(”) XMITQ(QMB.XMITQ)
On Queue Manager QMC
Testing of MultiHopping
Sample AMQSPUT0 end
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