kamailio_exporter fails to scrape metrics from kamailio docker container

[vishal-yadav]

Keep getting below error when trying to connect the kamailio container (exposed on 5056 port):

$ ./kamailio_exporter -u "tcp://localhost:5056" -m "tm.stats,sl.stats,core.shmmem,core.uptime"
2019/04/10 18:40:30 [error] cannot read header: read tcp 127.0.0.1:61780->127.0.0.1:5056: i/o timeout
2019/04/10 18:40:37 [error] cannot read header: read tcp 127.0.0.1:61786->127.0.0.1:5056: i/o timeout
2019/04/10 18:41:35 [error] cannot read header: read tcp 127.0.0.1:61806->127.0.0.1:5056: i/o timeout
...

Fails to scrape metrics from container:

$ curl -v http://localhost:9494/metrics
...
# HELP kamailio_exporter_failed_scrapes Number of failed kamailio scrapes
# TYPE kamailio_exporter_failed_scrapes counter
kamailio_exporter_failed_scrapes 2
# HELP kamailio_exporter_total_scrapes Number of total kamailio scrapes
# TYPE kamailio_exporter_total_scrapes counter
kamailio_exporter_total_scrapes 2
# HELP kamailio_up Was the last scrape successful.
# TYPE kamailio_up gauge
kamailio_up 0
...

Kamailio container seems to be running okay.

$ docker exec -it kamailio ps -eaf
PID   USER     TIME  COMMAND
    1 0         0:00 kamailio -DD -E
   19 0         0:00 kamailio -DD -E
$ docker exec -it kamailio netstat -tnlp |grep kamailio
tcp        0      0 0.0.0.0:5056            0.0.0.0:*               LISTEN      19/kamailio

Thanks in advance!

[vishal-yadav]

When checked binrpc, got to know that CTL should be listening on specific port by modparam(). Added in kamailio.cfg and started getting stats on that port from exporter.