On Sep 01, 2010 at 19:09, Daniel-Constantin Mierla <mico...@gmail.com> wrote: > > > On 9/1/10 7:01 PM, Andrei Pelinescu-Onciul wrote: > >On Sep 01, 2010 at 18:49, Klaus Darilion<klaus.mailingli...@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?
No, the system resolver is never used when the cache is enabled (except during very early initialisation before mod_init, e.g. mod_register or modparam callbacks). The problem with having fallback to the system resolver is that in case the entry is not in /etc/hosts (or similar), you will have double queries for each failure and you would also not be able to do any dns fallback / srv rec. load balancing (which depend on having cached records). > > Just for sake of completing info in this thread, disabling > completely the internal cache is by global parameter: > dns_cache_init=no but note also that you won't have dns fall-back. Andrei > > 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 > >>> > >>> > >>> > >>>_______________________________________________ > >>>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > >>>sr-users@lists.sip-router.org > >>>http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >>_______________________________________________ > >>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > >>sr-users@lists.sip-router.org > >>http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >_______________________________________________ > >SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > >sr-users@lists.sip-router.org > >http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > > > -- > Daniel-Constantin Mierla > http://www.asipto.com/ _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
