asterisk users - Aug 2020 - PJSIP trunk is down when DNS was not available during the Asterisk start.

I deleted the res_resolver_unbound.so module, and now it works as expected.
So, the problem is related to the 'unbound' resolver?
FYI: I'm using Asterisk 16.2 installed from Debian 10 repository.

Best regards,
Leonid Fainshtein

On Thu, Aug 27, 2020 at 3:01 PM Joshua C. Colp <jcolp at sangoma.com>
wrote:
> On Thu, Aug 27, 2020 at 8:58 AM Leonid Fainshtein <
> leonid.fainshtein at xorcom.com> wrote:
>
>> I see that pjsip_resolver.c tries unsuccessfuly to resolve the
>> hostname each 10 seconds:
>>
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Wrapper
created
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Set timer to
>> 2000 msec
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: Performing SIP
>> DNS resolution of target 'rpi6.in.xorcom.com'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c: Transport type
>> for target 'rpi6.in.xorcom.com' is 'Unspecified'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Created resolution tracking for target 'rpi6.in.xorcom.com'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Added target 'rpi6.in.xorcom.com' with record type
'35', transport
>> 'Unspecified', and port '0'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Added target '_sips._tcp.rpi6.in.xorcom.com' with record type
'33',
>> transport 'TLS', and port '5061'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Added target '_sip._tcp.rpi6.in.xorcom.com' with record type
'33',
>> transport 'TCP', and port '5060'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Added target '_sip._udp.rpi6.in.xorcom.com' with record type
'33',
>> transport 'UDP', and port '5060'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Added target 'rpi6.in.xorcom.com' with record type '1',
transport 'UDP',
>> and port '5060'
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Starting initial resolution using parallel queries for target '
>> rpi6.in.xorcom.com'
>> [Aug 27 07:51:36] DEBUG[605] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> All parallel queries completed
>> [Aug 27 07:51:36] DEBUG[605] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Resolution completed - 0 viable targets
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_resolver.c:
[0x7f75282fe7f8]
>> Invoking user callback with '0' addresses
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: PJSIP tsx
>> response received
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Cancelling
>> timer
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Timer
cancelled
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: Callbacks
>> executed
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip.c: 0x7f75282eb150: wrapper
>> destroyed
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_options.c: Contact
g145/sip:
>> rpi6.in.xorcom.com status didn't change: Unreachable, RTT: 0.000
msec
>> [Aug 27 07:51:36] DEBUG[595] res_pjsip/pjsip_options.c: AOR
'g145' now
>> has 0 available contacts
>>
>> But a DNS server is available at this time:
>> # host rpi6.in.xorcom.com
>> rpi6.in.xorcom.com has address 192.168.0.175
>>
>> # ping rpi6.in.xorcom.com
>> PING rpi6.in.xorcom.com (192.168.0.175) 56(84) bytes of data.
>> 64 bytes from rpi6.in.xorcom.com (192.168.0.175): icmp_seq=1 ttl=64
>> time=0.990 ms
>>
>
> What DNS resolver implementation is in use? system or unbound?
>
> Asterisk itself doesn't do any caching, we defer it to the underlying
> implementation. It could be caching a negative response.
>
> --
> Joshua C. Colp
> Asterisk Technical Lead
> Sangoma Technologies
> Check us out at www.sangoma.com and www.asterisk.org
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/d740bb35/attachment.html>

On Thu, Aug 27, 2020 at 9:24 AM Leonid Fainshtein <
leonid.fainshtein at xorcom.com> wrote:
> I deleted the res_resolver_unbound.so module, and now it works as expected.
> So, the problem is related to the 'unbound' resolver?
> FYI: I'm using Asterisk 16.2 installed from Debian 10 repository.
>
It would be a result of behavior within the unbound resolver library. Our
module is a thin wrapper over it.

-- 
Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/b0a1f056/attachment.html>

Is it possible to disable the unbond resolver in the asterisk
configuration? Or, it is necessary just to disable the module?
Best regards,
Leonid Fainshtein



On Thu, Aug 27, 2020 at 3:29 PM Joshua C. Colp <jcolp at sangoma.com>
wrote:
> On Thu, Aug 27, 2020 at 9:24 AM Leonid Fainshtein <
> leonid.fainshtein at xorcom.com> wrote:
>
>> I deleted the res_resolver_unbound.so module, and now it works as
>> expected.
>> So, the problem is related to the 'unbound' resolver?
>> FYI: I'm using Asterisk 16.2 installed from Debian 10 repository.
>>
>
> It would be a result of behavior within the unbound resolver library. Our
> module is a thin wrapper over it.
>
> --
> Joshua C. Colp
> Asterisk Technical Lead
> Sangoma Technologies
> Check us out at www.sangoma.com and www.asterisk.org
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at:
> https://community.asterisk.org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.digium.com/pipermail/asterisk-users/attachments/20200827/a95c8887/attachment.html>