intermittent SERVFAIL for high visible domains such as *.google.com
Brian J. Murrell
brian at interlinx.bc.ca
Wed Jan 17 15:45:01 UTC 2018
I have a BIND (9.9.4) server that runs well most of the time, but
periodically it will start returning SERVFAIL for very high-level
domains such as *.google.com, *.gstatic.com, *.github.com, etc. It
seems to happen most frequently with Google domains, but I wonder if
that is just a reflection on the percentage of queries I have for those
In any case when this happens, it will last a few minutes until it
resolves itself and/or I issue an "rndc reload". That always seems to
correct it if I don't care to wait it out.
I'm wondering what the steps are to try to get to the bottom of this.
I have a db dump (rndc dumpdb) as well as some trace (rndc trace x10)
while this is happening. Is this enough? If so, what should I look
for as a cause of the SERVFAILs?
If not, what more do I need to collect? Do I need tracing enabled
before the situation happens? What level (how many "rndc trace"s
should I run)?
Very greatful for any help.
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