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Communicating with a Queue Manager outside Cluster - Middleware News

Communicating with a Queue Manager outside Cluster - Middleware News


Assumptions:

1. You already have a Queue Manager cluster (named QMGRCLUS) setup with 2 Queue Managers with names QM1 and QM2 and all the requires channels are setup for communication between QM1 and QM2

2. You have QM3, which is outside the cluster

3. QM2 has a Queue [Q2] defined at cluster level.

In this tutorial, let us send message from QM3’s Q3 to QM2’s Q2 and in the reverse path.

In this case one of your Queue Managers should act as a gateway. Say for example, lets make QM1 as the gateway for cluster and QM3 is outside cluster.

Steps:

1. The queue manager outside the cluster must have a QREMOTE definition for each queue in the cluster that it wants to put messages to.

DEFINE QREMOTE(Q2) RNAME(Q2) RQMNAME(QM2) XMITQ(TQ1) [in this case Q2 is a cluster queue and i want to put message from QM3 -> QM2]
2. QM3 must have a SDR channel and TX queue to QM1 and QM1 should have corresponding RCVR channel

For replies:

3. The gateway (QM1) advertises a queue-manager alias for the queue manager outside the cluster. It advertises this alias to the whole cluster by adding the cluster attribute to its queue-manager alias definition.
DEFINE QREMOTE(QM3) RNAME(‘ ‘) RQMNAME(QM4) CLUSTER(QMGRCLUS)
4. QM1 must have a SDR channel and TX queue to QM4 and QM4 should have corresponding RCVR channel.

Observe the below diagram, to understand the setup

image

Now, you need to define the following, for communicating from QM3 to Cluster and Cluster to QM3.

on QM1:

DEFINE QL(TQ3) USAGE(XMITQ)
DEFINE LISTENER(QM1_LIST) TRPTYPE(TCP) PORT(1111)
DEFINE CHANNEL(TO.QM3) CHLTYPE(SDR) TRPTYPE(TCP) CONNAME(‘localhost(3333)’) XMITQ(TQ3)
DEFINE CHANNEL(TO.QM1) CHLTYPE(RCVR) TRPTYPE(TCP)CONNAME(‘localhost(1111)’)
DEFINE QREMOTE(QM3) RNAME(‘ ‘) RQMNAME(QM3) XMITQ(TQ3) CLUSTER(QMGRCLUS)

on QM2:

DEFINE QL(Q2) CLUSTER(QMGRCLUS)
DEFINE LISTENER(QM2_LIST) TRPTYPE(TCP) PORT(2222)

on QM3:

DEFINE QL(Q3)
DEFINE QL(TQ1) USAGE(XMITQ)
DEFINE LISTENER(QM3_LIST) TRPTYPE(TCP) PORT(3333)
DEFINE CHANNEL(TO.QM1) CHLTYPE(SDR) TRPTYPE(TCP) CONNAME(‘localhost(1111)’) XMITQ(TQ1)
DEFINE CHANNEL(TO.QM3) CHLTYPE(RCVR) TRPTYPE(TCP)CONNAME(‘localhost(3333)’)
DEFINE QREMOTE(Q2) RNAME(Q2) RQMNAME(QM2) XMITQ(TQ1)

Start all the listeners on QM1/2/3 and Ensure all channels are running. First test that you are able to communicate between QM1 and QM2.

Then, you should be able to put messages
QM3[Q3] –> QM2[Q2]
QM2[Q2] –> QM3[Q3]
Similarly, if you have any queue on QM1, create corresponding QREMOTE on QM3(which is outside).
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