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Message
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| MQMB&WAS |
 Posted: Wed Apr 11, 2018 5:16 am Post subject: How to connect to clustered qmgrs concurrently? |
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Centurion
Joined: 12 Jun 2016
Posts: 130
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Hi guys,
We have an application using its application server's MQ adapter to connect and put messages to qmgr. Now, there is a need to add another qmgr and cluster them. How can we make the app connect to both the qmgrs concurrently or at least reconnect to the 2nd qmgr when the 1st one becomes unavailable?
Below are the only fields available in the adapter.
MQSeries Server:
Port:
Channel:
Queue name:
Queue Manager:
SSL cipher suite:
Appreciate any inputs. |
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| exerk |
| Posted: Wed Apr 11, 2018 5:46 am Post subject: Re: How to connect to clustered qmgrs concurrently? |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| MQMB&WAS wrote: |
| ...Now, there is a need to add another qmgr and cluster them... |
Presumably to load-balance the message traffic?
| MQMB&WAS wrote: |
| ...How can we make the app connect to both the qmgrs concurrently... |
Normally by coding it to do so...
| MQMB&WAS wrote: |
| ...or at least reconnect to the 2nd qmgr when the 1st one becomes unavailable? |
Generally by using a CCDT file, but your statement begs the question - if your application can only connect to one queue manager at a time, what's the point of load-balancing message traffic rather than using a high-availability solution?
| MQMB&WAS wrote: |
Below are the only fields available in the adapter.
MQSeries Server:
Port:
Channel:
Queue name:
Queue Manager:
SSL cipher suite:
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Looks to me like you're stuffed - one queue manager, and one queue seems to be it.
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| mvic |
| Posted: Wed Apr 11, 2018 5:54 am Post subject: Re: How to connect to clustered qmgrs concurrently? |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| MQMB&WAS |
| Posted: Wed Apr 11, 2018 6:00 am Post subject: |
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Centurion
Joined: 12 Jun 2016
Posts: 130
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Thanks for your time guys.
I meant MQ qmgr cluster. And the purpose is to provide failover.
I know Multi-Instance qmgr is a solution, but we are looking for other options.
Is there any other way to have this app (using the adapter) reconnect to the 2nd qmgr when the 1st one goes down?
Can F5 load balancer be used here? |
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| exerk |
| Posted: Wed Apr 11, 2018 6:11 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| MQMB&WAS wrote: |
| Can F5 load balancer be used here? |
As it looks to me that you're instantiating a client connection, yes.
But my question remains - if you're going to load-balance message traffic, what (if anything) is going to service the queue on the unconnected-to queue manager?
Or are you going to try the pain of setting cluster workload priorities, in which case watch what happens when there's a 'cough' on the more-highly-prioritised channel...
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| Vitor |
| Posted: Wed Apr 11, 2018 6:18 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| MQMB&WAS wrote: |
I meant MQ qmgr cluster. And the purpose is to provide failover.
I know Multi-Instance qmgr is a solution, but we are looking for other options. |
MQ clustering is not one of the other options.
You'll find a lot of discussion on this in here with the aid of the search facility, and I echo the questions/concerns of my worthy associate. The other common question asked in this scenario is how you plan to process messages delivered to the downed queue manager but not yet retrieved by the application?
This is a stony road that will only lead you to misery.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| exerk |
| Posted: Wed Apr 11, 2018 6:21 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| Vitor wrote: |
| ...The other common question asked in this scenario is how you plan to process messages delivered to the downed queue manager but not yet retrieved by the application? |
When I answered such a question (without a trace of irony) with "would you like me to chisel the electrons off the platter?", it was met with a stony silence...
...some people just have NO sense of humour.
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| bruce2359 |
| Posted: Wed Apr 11, 2018 6:25 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9396
Location: US: west coast, almost. Otherwise, enroute.
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| MQMB&WAS wrote: |
| I meant MQ qmgr cluster. |
I've lost track. You 'meant MQ qmgr cluster' with regards to what? An app doesn't connect to a cluster.
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| Vitor |
| Posted: Wed Apr 11, 2018 6:27 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| exerk wrote: |
| ...some people just have NO sense of humour. |
I believe you to be one of them.
You hated that clown I got you for your birthday party. Even after he offered to let you float with the others....
In fairness, his act did go down the toilet pretty quickly.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| exerk |
| Posted: Wed Apr 11, 2018 6:29 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| Vitor wrote: |
| exerk wrote: |
| ...some people just have NO sense of humour. |
I believe you to be one of them.
You hated that clown I got you for your birthday party. Even after he offered to let you float with the others....
In fairness, his act did go down the toilet pretty quickly. |
Sharper than a serpents tooth you are 
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| Vitor |
| Posted: Wed Apr 11, 2018 6:37 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| exerk wrote: |
| Vitor wrote: |
| exerk wrote: |
| ...some people just have NO sense of humour. |
I believe you to be one of them.
You hated that clown I got you for your birthday party. Even after he offered to let you float with the others....
In fairness, his act did go down the toilet pretty quickly. |
Sharper than a serpents tooth you are |
Nice to see the Jedi training is going well.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| Vitor |
| Posted: Wed Apr 11, 2018 6:43 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| bruce2359 wrote: |
| MQMB&WAS wrote: |
| I meant MQ qmgr cluster. |
I've lost track. You 'meant MQ qmgr cluster' with regards to what? An app doesn't connect to a cluster. |
A response to this I think:
So the OP clarified he did mean MQ clusters, and he did mean HA, and it will get mean.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| MQMB&WAS |
| Posted: Wed Apr 11, 2018 6:57 am Post subject: |
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Centurion
Joined: 12 Jun 2016
Posts: 130
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| exerk wrote: |
| MQMB&WAS wrote: |
| Can F5 load balancer be used here? |
As it looks to me that you're instantiating a client connection, yes. |
Yes, for a client connection.
| exerk wrote: |
But my question remains - if you're going to load-balance message traffic, what (if anything) is going to service the queue on the unconnected-to queue manager?
Or are you going to try the pain of setting cluster workload priorities, in which case watch what happens when there's a 'cough' on the more-highly-prioritised channel... |
The messages will be sent to an outside qmgr via message channels.
We're looking for a connection failover solution for the app(using the adapter). |
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| Vitor |
| Posted: Wed Apr 11, 2018 7:03 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| MQMB&WAS wrote: |
The messages will be sent to an outside qmgr via message channels. |
This makes no sense as written.
You have 2 queue managers in an MQ cluster. You're connecting to one or other (or both) of the queue managers (because you can't connect to the cluster) via an F5. One of the queue managers goes down, so the application connects to the other one, possibly establishing 2 connections to it.
What's sending messages to an outside queue manager via message channels, where is it sending the messages from and what's happening to the messages on the downed queue manager?
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| MQMB&WAS |
| Posted: Wed Apr 11, 2018 7:28 am Post subject: |
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Centurion
Joined: 12 Jun 2016
Posts: 130
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ok, let me explain the current setup.
The application actually has 2 qmgrs (not clustered) to use. These 2 qmgrs have sender channels to vendor qmgrs to route the msgs.
In the app server's adapter they put the below details to connect and put msgs to 1 qmgr (so, the other qmgr is just idle, not taking any msgs)
MQSeries Server:
Port:
Channel:
Queue name:
Queue Manager:
SSL cipher suite:
Now, when the app team notices an issue with the 1st qmgr/server, they manually change the settings in the adapter to connect/put to the 2nd qmgr. App team is not worried about the msgs on the downed qmgr. They will be routed to the vendor once the qmgr becomes available.
Now, we are looking for a way to automate the client re-connection, so the app team doesn't have to manually change the settings in the adapter.
So, from what I understand F5 can be used for this? If so, I'll do some research on how to configure it. |
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