Hello all, Thank you for your enlightening answers. I ended up creating DNS entries anyway, so it's all good now. use_dns_cache=no sounded a little scary :-).
BR. George On Tue, 19 May 2020 at 19:44, Daniel-Constantin Mierla <mico...@gmail.com> wrote: > A quick follow up as I found quite interesting that nowadays *BSDs allow > specifying order of lookup in resolv.conf to include the hosts file, but > that doesn't seem to be in Linux: > > * https://man.openbsd.org/resolv.conf.5#lookup > > Cheers, > Daniel > > > On 19.05.20 17:48, Daniel-Constantin Mierla wrote: > > Hello, > > > > worth to clarify that Kamailio doesn't implement a dns resolver from > > scratch, it still uses the functions from libc. It only does caching and > > try to use cashing records first. > > > > By default, the following dns functions are used internally when the > > cache doesn't have the record already -- they are set in the dns_func > > structure: > > > > struct dns_func_t dns_func = { > > res_init, > > res_search, > > gethostbyname, > > #ifdef HAVE_GETHOSTBYNAME2 > > gethostbyname2 > > #else > > NULL > > #endif > > }; > > > > So practically by leveraging res_init()/res_search() is relying on > > /etc/resolv.conf to do DNS queries, which is not using the /etc/hosts > > (iirc). For more see: > > > > * https://linux.die.net/man/3/res_search > > > > Cheers, > > Daniel > > > > On 19.05.20 17:23, Alex Balashov wrote: > >> You are correct that Kamailio does not use the libc resolver / > >> libresolv, but rather its own resolver, which ignores /etc/hosts. > >> > >> -- Alex > >> > >> On 5/19/20 10:42 AM, George Diamantopoulos wrote: > >>> Hello all, > >>> > >>> I've come across this today when trying to setup DMQ replication: > >>> > >>> root@sbcpub0-stage-lhe0-cn1:/root# systemctl restart kamailio > >>> root@sbcpub0-stage-lhe0-cn1:/root# kamcmd dmq.list_nodes > >>> { > >>> host: 172.30.154.189 > >>> port: 5090 > >>> resolved_ip: 172.30.154.189 > >>> status: active > >>> last_notification: 0 > >>> local: 1 > >>> } > >>> root@sbcpub0-stage-lhe0-cn1:/root# getent hosts > >>> dmq-ng.services.domain.com <http://dmq-ng.services.domain.com> > >>> 172.30.154.189 dmq-ng.services.domain.com > >>> <http://dmq-ng.services.domain.com> > >>> 172.17.130.13 dmq-ng.services.domain.com > >>> <http://dmq-ng.services.domain.com> > >>> > >>> root@sbcpub0-stage-lhe0-cn1:/root# grep dmq-ng /etc/kamailio/* > >>> /etc/kamailio/kamailio-module-params.cfg:modparam("dmq", > >>> "notification_address", "sip:dmq-ng.services.domain.com:5090 > >>> <http://dmq-ng.services.domain.com:5090>") > >>> > >>> In another case, where the resolving IPs for the DMQ service hostname > >>> were listed as A records in DNS, this worked as expected. > >>> In this case, the second host of the DMQ group is not listed in > >>> dmq.list_nodes, despite its being set in /etc/hosts, as shown by the > >>> getent command. > >>> > >>> Doesn't kamailio use nss for hostname resolution? Am I missing > >>> something else? Thanks! > >>> > >>> BR, > >>> George > >>> > >>> > >>> _______________________________________________ > >>> Kamailio (SER) - Users Mailing List > >>> sr-users@lists.kamailio.org > >>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users > >>> > >> -- > >> Alex Balashov | Principal | Evariste Systems LLC > >> > >> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) > >> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ > >> > >> _______________________________________________ > >> Kamailio (SER) - Users Mailing List > >> sr-users@lists.kamailio.org > >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users > > -- > > Daniel-Constantin Mierla -- www.asipto.com > > www.twitter.com/miconda -- www.linkedin.com/in/miconda > > Funding: https://www.paypal.me/dcmierla > > > -- > Daniel-Constantin Mierla -- www.asipto.com > www.twitter.com/miconda -- www.linkedin.com/in/miconda > Funding: https://www.paypal.me/dcmierla > > > _______________________________________________ > Kamailio (SER) - Users Mailing List > sr-users@lists.kamailio.org > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >
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