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?