RE: DNS Server Reboots and Oracle EBS Issues
Date: Tue, 27 Oct 2015 14:52:01 -0700
Message-ID: <01f301d11101$b66b7470$23425d50$_at_comcast.net>
Have your linux admins setup local DNS caching for each server. Set appropriate expire time for the cache to cover the DNS upgrades.
Matthew Parker
Chief Technologist
425-891-7934 (cell)
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From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Alfredo Abate
Sent: Tuesday, October 27, 2015 2:42 PM
To: oracle-l_at_freelists.org
Subject: DNS Server Reboots and Oracle EBS Issues
Hello,
In our Oracle E-Business Suite 12.1.3 environments, we have been having some minor issues when it comes to our DNS servers being rebooted for Windows patching (both primary and secondary but in a staggered fashion). During this time the Oracle EBS application servers are momentarily unable to ping each other and we see this in our Internal Manager logs. They recover successfully and the whole thing lasts around 2-3 minutes. This is not an issue now as it happens during a maintenance window when no users are on the system but that will change in the future when we are a true 24/7 environment. We observe this in both our Production and Non-Production environments.
Both Oracle EBS and Database are on Linux 6.4. We are testing the timeout and attempts parameters that are in resolv.conf to see if we can find a balance for it to fail-over to a secondary DNS server within a reasonable amount of time. Oracle provides an ebs_server R12 pre-install RPM that we have installed and sets the values to attempts 5 and timeout 15. This hasn't seemed to help us but we are continuing to tweak these to see if a different value helps us.
Our infrastructure team mentioned hard coding the application/database servers in /etc/hosts so it can resolve the name and won't lose connectivity when DNS is unavailable. This is not my preferred method but wanted to see what others thought.
I'm curious to hear if others have experienced this issue and how they manage dealing with DNS server maintenance/reboots for their Oracle environments (E-Business and/or Database)?
Thanks,
Alfredo
-- http://www.freelists.org/webpage/oracle-lReceived on Tue Oct 27 2015 - 22:52:01 CET