[SR-Users] Kamailio not using system resolver for hostname resolution (DMQ)?

[Alex Balashov]

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 at sbcpub0-stage-lhe0-cn1:/root# systemctl restart kamailio
> root at 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 at 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 at 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
> 
> 
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-- 
Alex Balashov | Principal | Evariste Systems LLC

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