That sounds right, and it sounds like their primary’s DNS cache is not
repopulated by the time they stagger to for the secondary DNS patch. Then in
turn their DNS server is too slow to find and deliver the answer before timeout
when it is not cached. I’d take that as important diagnostic information to
cure the root cause.
Last time I looked carefully, /etc/hosts was the first check, before the
attempt to resolve by DNS. I always thought that was useful since it should be
more difficult to hack your /etc/hosts file than to fall victim to a DNS spoof.
Since re-hosting apps servers is something that is normally carefully planned,
I think the update to /etc/hosts is a small hassle to be able to look up a firm
local value instead of fetching from a service.
That’s just my opinion and your mileage may vary.
mwf
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Powell, Mark
Sent: Wednesday, October 28, 2015 8:36 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: DNS Server Reboots and Oracle EBS Issues
I am not a network person but shouldn’t you have both a primary and a secondary
DNS server so that if the primary DNS server undergoes maintenance all the
applications obtain DNS from the secondary server? Maintenance to your primary
DNS server should not prevent host name resolution via DNS.
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of John Hallas
Sent: Wednesday, October 28, 2015 4:11 AM
To: alfredo.abate@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: DNS Server Reboots and Oracle EBS Issues
Not sure why you don’t want to put the entries in /etc/hosts for a few servers
if that helps reduce any interruption to service
John
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Alfredo Abate
Sent: 27 October 2015 21:42
To: oracle-l@xxxxxxxxxxxxx
Subject: DNS Server Reboots and Oracle EBS Issues
Hello,
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
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