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 _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users