Hi Ben,
IMO, the log itself is broken as the data to be cached is not printable
....so the logs you see may be misleading.
When you say "OpenSIPS appeared to not be able to resolve the domain",
you mean OpenSIPS is not doing any attempt to solve the FQDN, or you
mean OpenSIPS is loading from cash something wrong ?
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
https://www.opensips-solutions.com
OpenSIPS Summit 2019
https://www.opensips.org/events/Summit-2019Amsterdam/
On 12/06/2018 10:17 PM, Ben Newlin wrote:
Hello,
We use the DNS cache module to reduce the time spent querying DNS
records. We recently had a customer call failing and we traced the
failure to the customer using an FQDN in the Record-Route header. On
the ACK, OpenSIPS appeared to not be able to resolve the domain even
though it had been successfully resolved on the initial request. I
found the log for the DNS Cache module and noticed that the value it
was inserting was empty:
INFO:dns_cache:put_dnscache_value: putting key
[dnscache_customer.domain.com_a] with value [] ttl = 60
This prompted me to examine all of our logs and I found that the value
for these DNS Cache logs is always empty, regardless of the domain. It
appears the records are not being serialized properly into the cache.
The DNS resolution must be succeeding or all of our requests using DNS
would be failing, but I have also verified the domains all can be
resolved manually on the same box:
$ nslookup customer.domain.com
Server: 10.27.0.2
Address: 10.27.0.2#53
Non-authoritative answer:
Name: customer.domain.com
Address: 10.27.172.132
Name: customer.domain.com
Address: 10.27.192.211
Name: customer.domain.com
Address: 10.27.255.53
Any thoughts? Is there more information I can obtain to determine the
cause?
Ben Newlin
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