All of these seem like hacks to resolve the problem of you not being able to resolve the hostname. 

Perhaps there’s a docker setting or dns you can use to provide stability or investigate why the host isn’t being resolved. 

If the host doesn’t exist when you start kamailio then clearly it will be down and a better way would be to add the dispatcher entries when the host exists and reload. 

If you search for kamailio and docker, Sean McCord has discussed this at both astricon and kamailio world. 

-- Fred



On Jul 14, 2019, at 09:20, David Villasmil <david.villasmil.work@gmail.com> wrote:

If the dns resolution fails, don’t you get the event route
dispatcher:dst-down
 fired?
You could use that route to remove the entry from the dispatcher list.

David

On Sun, 14 Jul 2019 at 12:29, Amir <gheshlaghy@gmail.com> wrote:
Thank you, Maybe I should develop a health check mechanism and save the result in kamailio db and after that:
kamctl dispatcher reload

On Sun, Jul 14, 2019 at 3:23 PM Sergey Safarov <s.safarov@gmail.com> wrote:
as option you can reload dispatcher table instead of kamailio restart.
kamctl dispatcher reload



On Sun, Jul 14, 2019 at 1:27 PM Amir <gheshlaghy@gmail.com> wrote:
Sorry for mistyping :
I can make it work like this:
Start Kamailio first Then start asterisk containers Then restart KAMAILIO


On Sun, Jul 14, 2019 at 2:50 PM Amir <gheshlaghy@gmail.com> wrote:
Hi Henning
Thank you for clearing that up, I have 3 problem which you have mentioned 2 of them:
- because of the missing DNS entry your Kamailio would not (re)start properly: I tried flag 16  as you mentioned but still dose not work
1 sip:asterisk:7060 16
1 sip:asterisk2:7060 16
1 sip:asterisk3:7060 16
- because of the missing DNS entry the dispatcher module would not detect the asterisk server as "down"
- because of the missing DNS entry my Asterisks would not (re)start properly
maybe I should try asterisk realtime for the last problem

I can make it work like this:
Start Kamailio first Then start asterisk containers Then restart astersik

Cheers
Amir


On Sun, Jul 14, 2019 at 1:31 PM Henning Westerholt <hw@skalatan.de> wrote:

Hello Amir,

what is your issue exactly:

- because of the missing DNS entry the dispatcher module would not detect the asterisk server as "down"

- because of the missing DNS entry your Kamailio would not (re)start properly

You could try with flag 16 to disable DNS resolution at startup in your dispatcher file:

https://kamailio.org/docs/modules/5.2.x/modules/dispatcher.html#idm1020020140

Cheers,

Henning

Am 14.07.19 um 09:33 schrieb Amir:
I do not have a DNS server, Docker User-defined networks has it's own built in DNS server,
The problem is when I stop a container its DNS record would be deleted and therefore kamailio server could not check server health.
I think if I could tell kamailio server that IF you did not find a DNS record it means that a server is down my solution would work.

On Sat, Jul 13, 2019 at 10:56 PM Mojtaba <mespio@gmail.com> wrote:
Hello,
Did you add SRV record for each server in your DNS server?

On Sat, Jul 13, 2019 at 6:07 PM Fred Posner <fred@palner.com> wrote:
>
> The error indicates kamailio can not resolve the location of asterisk2. Try checking the dns (can you resolve it on the kamailio box?) or using the IP.
>
> -- Fred
>
>
> On Jul 13, 2019, at 07:09, Amir <gheshlaghy@gmail.com> wrote:
>
> Hi
> I have created a kamailio container with docker and two asterisk container
> And this is my dispatcher list:
> 1 sip:asterisk:5060
> 1 sip:asterisk2:5060
> and this is my both asterisk SIP.conf
> [Kamailio]
> host=kamailio
> port=5060
> insecure=invite
> type=friend
> context=from-internal
>
> The problem is that I use User-defined networks which has its own DNS
> when a container starts a dns record would be set
> If I start a kamailio first then start two asterisks the asterisk works fine
> because the name "kamailio" has been set in docker dns
> but I should restart the kamailio because at startup It could not resolve astersik dns records
> after the everything works fine but if the any of the asterisk instances crash/stop kamailio
> can not detect that because a dns record would not be available:
>
> 17(22) ERROR: <core> [core/resolve.c:1684]: sip_hostport2su(): could not resolve hostname: "asterisk2"
> 17(22) ERROR: tm [ut.h:309]: uri2dst2(): failed to resolve "asterisk2"
> 17(22) ERROR: tm [uac.c:452]: t_uac_prepare(): no socket found
> 17(22) ERROR: dispatcher [dispatch.c:3110]: ds_ping_set(): unable to ping [sip:asterisk2:5060]
>
>
> It is kind of loop , I think maybe I can fix asterisk problem with asterisk realtime and
> set the sip.conf in database.
> anyone has any suggestion for this problem?
>
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Kamailio services - https://skalatan.de/services
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David Villasmil
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