[OpenSIPS-Users] DNS Cache module

[Bogdan-Andrei Iancu]

Hi Ben,

What exact version / revision of OpenSIPS do you use ? maybe I can help 
adding some extra debug logs.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Summit 2019
   https://www.opensips.org/events/Summit-2019Amsterdam/

On 12/07/2018 08:14 PM, Ben Newlin wrote:
>
> Bogdan,
>
> That had occurred to me as well. I have verified testing locally that 
> when successful the value is printed in the log. I have also verified 
> manually on the system with the error that the key does exist in the 
> cache, but the value in the cache is empty, just as in the log. That 
> is what I believe is causing the failure, the lookup from the cache is 
> successful (the key exists) but the value is empty, so OpenSIPS cannot 
> route.
>
> I have attempted increasing the logging on the system, but it appears 
> the dns_cache module does not log anything further of use.
>
> Ben Newlin
>
> *From: *Bogdan-Andrei Iancu <bogdan at opensips.org>
> *Date: *Friday, December 7, 2018 at 12:21 PM
> *To: *OpenSIPS users mailling list <users at lists.opensips.org>, Ben 
> Newlin <Ben.Newlin at genesys.com>
> *Subject: *Re: [OpenSIPS-Users] DNS Cache module
>
> 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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>
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>

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