High availability redundancy failover
VoIPmonitor supports full redundancy and seamlessly failover switch. VoIPmonitor is installed on two servers which are both connected to mirroring switch where each server receives the same SIP/RTP traffic. MySQL is configured to Master-Master replication. Active node activly writes CDR to database while the passive is running but CDR are turned off but still writing pcap files on disk. Once active node dies or switches to maintainance mode the secondary nodes takes a shared IP and activates writing to CDR database.
This guide is for Debian 6
configure voipmonitor sniffer with redundancy
topology
Node1 IP:10.0.0.1 Node2 IP:10.0.0.2 Shared IP 10.0.0.128
Installing hearbeat
Installing HA
apt-get install heartbeat
edit /etc/hosts
127.0.0.1 localhost 10.0.0.1 voipmonitor1 10.0.0.2 voipmonitor2
edit /etc/hostname to match voipmonitor1 and voipmonitor2
allow binding of shared ip adress by editing /etc/sysctl.conf adding the following line (lb1&lb2)
net.ipv4.ip_nonlocal_bind=1
run sysctl to activate changes
sysctl -p
generate file /etc/ha.d/authkeys on both nodes following content:
auth 3 3 md5 somerandomstring
set permissions
chmod 600 /etc/ha.d/authkeys
create file /etc/ha.d/ha.cf on both nodes
# # keepalive: how many seconds between heartbeats # keepalive 2 # # deadtime: seconds-to-declare-host-dead # deadtime 10 # # What UDP port to use for udp or ppp-udp communication? # udpport 694 bcast eth0 # mcast eth0 225.0.0.1 694 1 0 ucast eth0 10.0.0.2 # What interfaces to heartbeat over? udp eth0 # # Facility to use for syslog()/logger (alternative to log/debugfile) # #logfacility local0 # # Tell what machines are in the cluster # node nodename ... -- must match uname -n node voipmonitor1 node voipmonitor2
on node2 change ucast eth0 10.0.0.2 to ucast eth0 10.0.0.1
on both nodes create file /etc/ha.d/haresources with the same exact content (do not be confused that the voipmonitor1 is also on node2 this in fact tells that voipmonitor1 is primary node)
voipmonitor1 10.0.0.128 IPsrcaddr::10.0.0.128 voipmonitor
this harseources will activate IP 10.0.0.128 and runs voipmonitor script (it is run from left to right once the node becomes master). When the node becomes slave it will run the script from right to left with parametr stop)
Create file in /etc/ha.d/resource.d/voipmonitor
#!/bin/bash
#
# This script is inteded to be used as resource script by heartbeat
#
# May 2012 by Martin Vit
#
###
. /etc/ha.d/shellfuncs
case "$1" in
start)
echo "enablecdr" | nc localhost 5029 >/dev/null 2>/dev/null
;;
stop)
echo "disablecdr" | nc localhost 5029 >/dev/null 2>/dev/null
;;
status)
;;
*)
echo "Usage: {start|stop|status}"
exit 1
;;
esac
exit 0