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MQSeries.net Forum IndexIBM MQ Installation/Configuration SupportDNS Switchover and Impact to MQ connection

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krypton
PostPosted: Tue May 16, 2017 5:33 am Post subject: DNS Switchover and Impact to MQ connection Reply with quote

Centurion

Joined: 14 Mar 2010
Posts: 112

We have number of JBOSS applications connecting to our MQ server using DNS hostname. On one weekend, we are gonna switch that DNS hostname to point to a new IP address, and on that IP address we have exact replica of Queue manager/Objects as the previous IP address.

So, if we switch over, do you think we need to restart all the JBOSS applications JVMs? Do you think we can have lose data or lose connections?
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bruce2359
PostPosted: Tue May 16, 2017 5:38 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 7858
Location: US: west coast, almost. Otherwise, enroute.

Have you tried this in TEST? What were the results?
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krypton
PostPosted: Tue May 16, 2017 5:55 am Post subject: Reply with quote

Centurion

Joined: 14 Mar 2010
Posts: 112

unfortunately, we currently don't have a setup of test system which replicates all scenarios.
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bruce2359
PostPosted: Tue May 16, 2017 12:25 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 7858
Location: US: west coast, almost. Otherwise, enroute.

krypton wrote:
unfortunately, we currently don't have a setup of test system which replicates all scenarios.

Do you have a test system which replicates any scenarios? A simple JBOSS app across a simple channel discovered by DNS?
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PaulClarke
PostPosted: Tue May 16, 2017 1:47 pm Post subject: Reply with quote

Sentinel

Joined: 17 Nov 2005
Posts: 864
Location: New Zealand

Changing values in a DNS server should have no effect on running channels, be they sender/receiver or clients. However, it has been said many times that it is never a good idea to have two Queue Managers with the same name existing in two places. Clients can get confused (if they have any affinity at all), sender/receiver channels get confused with sequence numbers and MQ routing doesn't like two destinations with the same name (unless it is MQ Clustering),

Cheers,

Paul
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PeterPotkay
PostPosted: Tue May 16, 2017 3:57 pm Post subject: Reply with quote

Jedi Council

Joined: 15 May 2001
Posts: 7380

Ask the bosses of the JBOSS JVMs if they respect DNS Time To Live (TTL).
Ask your network dudes what the DNS TTL is for the name you are changing the IP address for.
Ask your JBOSS developers if their instances drop into reconnection logic when they lose their connection to a queue manager.
Ask your self if/how you will force those instances into a reconnect attempt.
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gbaddeley
PostPosted: Tue May 16, 2017 6:22 pm Post subject: Re: DNS Switchover and Impact to MQ connection Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1742
Location: Melbourne, Australia

krypton wrote:
We have number of JBOSS applications connecting to our MQ server using DNS hostname. On one weekend, we are gonna switch that DNS hostname to point to a new IP address, and on that IP address we have exact replica of Queue manager/Objects as the previous IP address.
So, if we switch over, do you think we need to restart all the JBOSS applications JVMs? Do you think we can have lose data or lose connections?

This is a risky plan. Switching over to a replica queue manager may not work, unless you can guarantee that its point-in-time state is exactly the same. Unprocessed messages on the original qmgr will become orphaned. Channels may not start. Manual remediation will be required.

A sound plan should be rehearsed in a Test environment (including remediation and failure scenarios) before attempting in Production.

There should never be a requirement to have duplicate queue manager names running in the network. If a qmgr is being migrated to a new server, it should be shutdown / disabled and properly migrated before starting the qmgr on a new server.
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