On Wed, Sep 1, 2010 at 2:09 PM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

On 9/1/10 7:01 PM, Andrei Pelinescu-Onciul wrote:

On Sep 01, 2010 at 18:49, Klaus Darilion<klaus.mailinglists@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.

when the cache is enabled and the record is not cached, will first dns query find the records in /etc/hosts and then cache it? Or in other words, if a query to internal cache fails, then is used the system resolver?

Just for sake of completing info in this thread, disabling completely the internal cache is by global parameter:
dns_cache_init=no

Thanks,
Daniel

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

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--
Daniel-Constantin Mierla
http://www.asipto.com/

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