Haproxy is doing quite a good job in High Availability tasks where traffic towards multiple backend servers has to be redirected based on the available one to sent data from the proxy to.
Lets say haproxy is configured to proxy traffic for App backend machine1 and App backend machine2.
Usually in companies people configure a monitoring like with Icinga or Zabbix / Grafana to keep track on the Application server is always up and running. Sometimes however due to network problems (like burned Network Switch / router or firewall misconfiguration) or even an IP duplicate it might happen that Application server seems to be reporting reachable from some monotoring tool on it but unreachable from Haproxy server -> App backend machine2 but reachable from App backend machine1. And even though haproxy will automatically switch on the traffic from backend machine2 to App machine1. It is a good idea to monitor and be aware that one of the backends is offline from the Haproxy host.
In this article I'll show you how this is possible by using 2 shell scripts and userparameter keys config through the autodiscovery zabbix legacy feature.
Assumably for the setup to work you will need to have as a minimum a Zabbix server installation of version 5.0 or higher.
1. Create the required haproxy_discovery.sh and haproxy_stats.sh scripts
You will have to install the two scripts under some location for example we can put it for more clearness under /etc/zabbix/scripts
[root@haproxy-server1 ]# mkdir /etc/zabbix/scripts
[root@haproxy-server1 scripts]# vim haproxy_discovery.sh
# Get list of Frontends and Backends from HAPROXY
# Example: ./haproxy_discovery.sh [/var/lib/haproxy/stats] FRONTEND|BACKEND|SERVERS
# First argument is optional and should be used to set location of your HAPROXY socket
# Second argument is should be either FRONTEND, BACKEND or SERVERS, will default to FRONTEND if not set
# !! Make sure the user running this script has Read/Write permissions to that socket !!
## haproxy.cfg snippet
# stats socket /var/lib/haproxy/stats mode 666 level admin
[ -n “$1” ] && echo $1 | grep -q ^/ && HAPROXY_SOCK="$(echo $1 | tr -d '