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)
<mailto:Dimensional.dba@xxxxxxxxxxx> Dimensional.dba@xxxxxxxxxxx
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From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Alfredo Abate
Sent: Tuesday, October 27, 2015 2:42 PM
To: oracle-l@xxxxxxxxxxxxx
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
