LibreNMS offers a way to check for services and/or ports. In this example, we will check for HTTPS/SSL.
First we need to enable services.
root@nms:/etc/nginx/conf.d# cat /opt/librenms/config.php | grep show_services
$config['show_services'] = 1;
$config['show_services'] = 1;
root@nms:/etc/nginx/conf.d#
Make sure the value for show_services is “1”. If not, change it to “1”.
We then need to install the nagios-plugins.
apt install nagios-plugins
Let’s add a dummy device. In this case, we will add a device for this web server, vernon.wenberg.net.
Make sure to de-select “SNMP” and select “Force add”.
Next, edit the device and head to the “Services” tab. In the Services tab, select “Add service”.
Name your device any name. For check type, use “http”. Remote host has to be the IP or valid DNS hostname for the device. For an HTTPS check, use the following parameters:
-E -S -p 443 --sni
If you are checking for a service that uses SSL, you need to make sure you include the “–sni” switch.
That’s it. You should see get checks and alerting on the HTTPS service. Go to the device and on the “Services” tab, you should see the following:
