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| DNS Switchover and Impact to MQ connection |
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| krypton |
 Posted: Tue May 16, 2017 5:33 am Post subject: DNS Switchover and Impact to MQ connection |
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Disciple
Joined: 14 Mar 2010
Posts: 186
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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 |
| Posted: Tue May 16, 2017 5:38 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Have you tried this in TEST? What were the results?
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| krypton |
| Posted: Tue May 16, 2017 5:55 am Post subject: |
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Disciple
Joined: 14 Mar 2010
Posts: 186
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unfortunately, we currently don't have a setup of test system which replicates all scenarios.
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| bruce2359 |
| Posted: Tue May 16, 2017 12:25 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| 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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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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| PaulClarke |
| Posted: Tue May 16, 2017 1:47 pm Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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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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Paul Clarke
MQGem Software
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| PeterPotkay |
| Posted: Tue May 16, 2017 3:57 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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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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Peter Potkay
Keep Calm and MQ On |
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| gbaddeley |
| Posted: Tue May 16, 2017 6:22 pm Post subject: Re: DNS Switchover and Impact to MQ connection |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| 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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Glenn |
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