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One of the two DNS server going down causes impacts

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Top Forums UNIX for Advanced & Expert Users One of the two DNS server going down causes impacts
# 8  
Old 01-18-2020
all of the above - and you can as well add the option
options rotate
into your /etc/resolv.conf - which enables your box to use all nameservers, not just the first.

Last edited by zxmaus; 01-18-2020 at 04:49 AM..
This User Gave Thanks to zxmaus For This Post:
# 9  
Old 01-18-2020
Thanks all for answering. I still do not understand why impact is observed when the secondary is down and the primary is still up.
# 10  
Old 01-18-2020
Originally Posted by broy32000
Thanks all for answering. I still do not understand why impact is observed when the secondary is down and the primary is still up.
The "norma"l approach for a root-cause analysis is to turn on verbose syslog logging for your DNS daemon processes and review the log files for errors and anomalies.

Did you mention your OS and what version of named (or whatever DNS daemon process) you are running, and your current logging configuration for this process?

Sorry, if I missed it.... please post "the details' again. Thanks.
# 11  
Old 01-18-2020
DNS servers are Windows 12. I do not have much control over those. Is there anyway to increase the verbosity of logging in AIX client?

The AIX clients are running AIX 6.x , as far as I remember. To me it's a puzzle that the services are impacted when the 2nd server in /etc/resolv.conf file goes down. I have not tested what happens if the first one goes down and the 2nd one remains up.

# 12  
Old 01-21-2020
Actually, if the 2nd nameserver in /etc/resolv.conf goes down, there is no impact at all, unless there is options rotate.
# 13  
Old 01-21-2020
are we sure the first one works / is accessible from the host. I agree with MadeInGermany there should be no need to ever go to the second if the first works fine. You could switch on options debug to see whats really wrong.
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