[SR-Users] Avoid resolving names by DNS

[Andrei Pelinescu-Onciul]

On Sep 01, 2010 at 18:49, Klaus Darilion <klaus.mailinglists at pernau.at> wrote:
> kamailio >= 3.0 is based on ser's core which has implemented its own
> caching resolver library. I do not know if there is a way to disable
> it complete and use the system's stub resolver. You could try the
> "use_dns_cache" option:
> http://sip-router.org/wiki/cookbooks/core-cookbook/devel#dns_parameters

Yes, if you disable the dns cache it will use the system resolver.
It's also used during the initial startup phase, when the dns cache is
not yet fully initialized.

You could also leave the cache enabled and add/remove records by hand
(using sercmd or xmlrpc) using the dns rpcs (e.g. dns_add_a,
dns.add_srv, dns.delete_a a.s.o, for more info see
http://sip-router.org/docbook/sip-router/branch/master/rpc_list/rpc_list.html#dns.add_a
).

Andrei

> 
> regards
> klaus
> 
> Am 01.09.2010 17:10, schrieb Santiago Soares:
> >Hello,
> >
> >I'm using kamailio as a simple load balancer.
> >My dispatcher list is something like that:
> >
> >1   sip:server1:5060
> >1   sip:server2:5060
> >2   sip:server1:5060
> >
> >and /etc/hosts is
> >
> >10.1.1.1   server1
> >10.1.1.2   server2
> >
> >When I want to do some maintenance task in one of the servers, server2,
> >for exemple, I simply change /etc/hosts like that:
> >
> >10.1.1.1   server1
> >10.1.1.1   server2
> >
> >And all the traffic is redirected to server 1. It's a simple yet
> >effective way to remove a server from balancing.
> >The thing is that it works on kamailio 1.5.3, but on kamailio 3.0.3 it
> >doesn't work, since kamailio appears to resolv names only by DNS.
> >I receive this message on startup:
> >
> >Sep  1 12:04:32 install /usr/local/sbin/kamailio[16077]: ERROR:
> >dispatcher [dispatch.c:241]: could not resolve server1
> >Sep  1 12:04:32 install /usr/local/sbin/kamailio[16077]: ERROR:
> >dispatcher [dispatcher.c:247]: no dispatching list loaded from file
> >Sep  1 12:04:32 install /usr/local/sbin/kamailio[16077]: ERROR: <core>
> >[sr_module.c:874]: init_mod(): Error while initializing module dispatcher
> >
> >
> >Is there any way to avoid this behavior, and force kamailio to use
> >/etc/hosts?
> >
> >Thank you.
> >
> >Santiago Soares
> >Fone: (41) 8488-0537
> >
> >
> >
> >_______________________________________________
> >SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> >sr-users at lists.sip-router.org
> >http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> 
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