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| simple question - MQIPT installed on a clustered server? |
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| CorbinANPAC |
 Posted: Thu May 02, 2013 11:05 am Post subject: simple question - MQIPT installed on a clustered server? |
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Newbie
Joined: 02 May 2013
Posts: 2
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Trying to search for clustering information gets me mostly to information about how MQ operates in a cluster/how to cluster MQ, and I'm driving myself up a wall trying to find an answer to what I feel is a simple question. I appologize if I missed this information somewhere, or if this should go in a different forum.
My company is installing MQ internet pass-thru, and the server in our DMZ that we've chosen to host it is itself part of a cluster. All I want to know is if MQIPT can function on a clustered server, if it is only installed on one server of the cluster.
I'm quite new to MQ stuff and if there needs to be more details provided, I will do my best to answer. I appreciate any help that can be given. |
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| mqjeff |
| Posted: Thu May 02, 2013 11:33 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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MQIPT is an application.
As an application, it can be made to fail over as part of HA cluster failover procedures using the same techniques and processes of the HA cluster management tool that any other application can use.
It does not, to the best of my knowledge, provide any HA management features itself, so you can't configure two copies of MQIPT and tell one of them to act as a backup to the other.
MQIPT makes MQ connections.
MQ connections always go to specific, individual queue managers, regardless of whether those queue managers belong to an MQ cluster or not. That is, nothing "connects" to an MQ Cluster, all connections terminate at specific queue managers.
If neither of those cover your meaning of the word 'cluster', then I at least am out of information that may be helpful. |
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| Vitor |
| Posted: Thu May 02, 2013 11:47 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| mqjeff wrote: |
| If neither of those cover your meaning of the word 'cluster', then I at least am out of information that may be helpful. |
@CorbinANPAC - be aware that the term "cluster" is used by HA software to describe a group of resources that participate in a fail over, and also by WMQ to describe queue managers grouped for workload balancing & administrative purposes. It's unclear from your post which type of "cluster" you're referring to, possibly because you yourself were unaware of the distinction, and equally possibly the source of the wall driving if you didn't realize 2 separate and distinct concepts would be described by the word "cluster' depending on what you were reading.
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| CorbinANPAC |
| Posted: Thu May 02, 2013 11:52 am Post subject: |
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Newbie
Joined: 02 May 2013
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My appologies, and no I'v enot worked with clustering enough to be fluent in it by any stretch.
I do not mean grouped queue managers. I mean the server that the MQIPT application is installed on is part of a server cluster. We're only installing MQIPT on one server in that cluster, and not seeking to have a failover setup. The question is if MQ will be able to connect to the correct server in the cluster, the server hosting the MQIPT application, or if the MQIPT application needs to be on a non-clustered server.
Hopefully that makes it more clear and not more confusing, but I clearly am not fluent in MQ enough to be sure. |
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| mqjeff |
| Posted: Thu May 02, 2013 12:18 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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If MQIPT is installed only on one of two machines in an HA failover group, and MQIPT is not configured to be part of the HA Failover group, and the HA failover group moves to the other machine, then one has to assume that MQIPT will not be running on the 'failed' server.
If MQIPT is not running, then one has to assume that nothing will be able to connect to it.
There's no particular reason not to configure MQIPT to be part of the HA failover group, that I can reasonably think of. |
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| Vitor |
| Posted: Thu May 02, 2013 12:45 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| CorbinANPAC wrote: |
| My appologies, and no I'v enot worked with clustering enough to be fluent in it by any stretch. |
No need to apologize; I was attempting to enlighten, inform and clarify.
| CorbinANPAC wrote: |
| I do not mean grouped queue managers. I mean the server that the MQIPT application is installed on is part of a server cluster. |
And behold, the clarification. Thank you.
| CorbinANPAC wrote: |
| We're only installing MQIPT on one server in that cluster, and not seeking to have a failover setup. The question is if MQ will be able to connect to the correct server in the cluster, the server hosting the MQIPT application, or if the MQIPT application needs to be on a non-clustered server. |
This begs the question why only 1 server, and why no failover? If there's a problem and the server hosting MQIPT goes down, do you plan to tell everyone who needs to use it, "well it just sucks to be you doesn't it?".
As my most worthy associate points out, MQIPT is just an application. If the cluster configuration (and associated vIP) points to the server with MQIPT running then MQ will be able to connect to it as it would any other IP aware application. If the traffic is distributed round the cluster in any way then all attempts to connect directed to a server where MQIPT is not installed will fail.
| CorbinANPAC wrote: |
| clearly am not fluent in MQ enough to be sure. |
This has nothing to do with MQ and everything to do with TCP/IP and your server cluster configuration.
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