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| DNS on WMB7 problems? |
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| mapa |
 Posted: Wed May 08, 2013 8:16 am Post subject: DNS on WMB7 problems? |
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Master
Joined: 09 Aug 2001
Posts: 257
Location: Malmö, Sweden
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To my big surprise it turns out that we have major problems on our AIX brokers.
We do have an open PMR with IBM recently created and it is our integration infrastructure team that handles it. But I thought I'd ask you here if you have any clues?
| Code: |
AIX oslevel: 6100-06
WMQ ver: 7.0.1.4
WMB ver: 7.0.0.3
IPv6 is disabled.
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The problem is that the DataFlow processes does DNS lookups all the time, often to look up their own hostname. This results in the DNS server being timing out once in a while and the whole machine seems to hang for 60 seconds where nothing is processed. (This is at least what the OS Infra guys are saying).
Due to policy reasons the /etc/hosts is not used, all requests goes to the DNS instead.
Java settings is as they should be for caching DNS.
Couldn't find anything similar for the broker.
Any ideas are appreciated.
(Except for upgrading, since the versions are lagging a little, but looking at release notes I couldn't find anything related in the latest FPs)
Update 2 (removed 1):
The netcd is active and works as in How to configure network caching daemon (netcd) to cache DNS answers? |
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| mqjeff |
| Posted: Thu May 09, 2013 8:38 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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This is the kind of thing that would be in an FP, but not necessarily terribly visible in the description of the FP. It would have been reported as part of a PMR that would have turned into an APAR. Whether the title of the APAR was directly correlatable with the concept of "dns lookups" is not guaranteed.
I'd review the apars listed in FPs again, and look through them in more detail for anything network related at all, or anything that might refer to hangs and timeouts.
there's an itch in the back of my mind that there is an APAR on this. But that's all I can say reliably. Presumably the PMR will be of more help. |
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| mapa |
| Posted: Mon May 20, 2013 3:29 am Post subject: |
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Master
Joined: 09 Aug 2001
Posts: 257
Location: Malmö, Sweden
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It did turn out to be server specific settings that was the problem.
1. the servers did not look at local (/etc/hosts).
2. no DNS cache configured (netcd subsystem).
3. the DNS configured on the server didn't support reverse lookups (no biggie)
The only odd thing was that the whole machine needed a reboot for broker to pick up the changes. Only restarting the broker did not help, it still kept referencing the old DNS instead of the newly configured one.
Case closed. |
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