Load balancer installation

SIP flow with load-balancer

    msc {

      arcgradient=0, hscale=2;

      C[label="Call originator\n11.11.11.11"],
      L[label="YETI Load balancer\n12.12.12.12"],
      S[label="SEMS Node\n13.13.13.13"];

      L alt S [label="POP", textbgcolor="#f7fff7"] {
      C => L [label="INVITE"];
      L => C [label="100 Trying"];
      L => S [label="INVITE\nX-ORIG-IP:11.11.11.11.11\nX-ORIG-PORT:5060\nX-ORIG-PROTO:1"];
      S rbox S [label= "Routing procedures"];
      S => L [label="100 Trying"];
      S => L [label="180 Ringing"];
      L => C [label="180 Ringing"];
      S => L [label="200 OK"];
      L => C [label="200 OK"];
      C >> S [label="RTP from originator"];
      S >> C [label="RTP to originator"];
      C => L [label="ACK"];
      L => S [label="ACK"];
      C => L [label="BYE"];
      L => S [label="BYE"];
      S => L [label="200 OK"];
      L => C [label="200 OK"];
      S rbox S [label= "CDR writing"];
      };
    }

Packages installation

root@server:~# apt update && apt install yeti-lb

Note

On package configuration stage you will be asked to specify address of previously installedsignaling node and address for load balancer to listen on.

After installation you can change any parameters by editing files: /etc/kamailio/dispatcher.list and /etc/kamailio/lb.conf

Warning

You should register your Load balancer instance as trusted load balancer. See System->Load balancers menu.

Launch

Launch load balancer:

root@server:~# service kamailio start

Checks

Check kamailio running and listening desired sockets:

root@server:~# pgrep kamailio
30853
30854
30855
30856
30857
root@server:~# netstat -lpn | grep kamailio
tcp 0 0 127.0.0.1:5060 0.0.0.0:* LISTEN 30857/kamailio
udp 0 0 127.0.0.1:5060 0.0.0.0:* 30853/kamailio
raw 0 0 0.0.0.0:255 0.0.0.0:* 7 30853/kamailio
unix 2 [ ACC ] STREAM LISTENING 2673337 30856/kamailio /var/run/kamailio//kamailio_ctl

Check for /var/log/syslog on possible errors.

Also you can run daemon in foreground with logging to stderr for debugging purposes:

root@server:~# kamailio /etc/kamailio/kamailio.cfg