want to configure rule for specific ports if they are open or not ?
like want librenms to notify me if one device has port 21 open is this possible
Should be possible with a nagios plugin service check.
check_tcp nagios plugin or similar
Yes this can be done. I use this to alert if ssh becomes available on some of our VMs that have a public-facing NIC/IP. This helps keep things secure if someone happens to disable ufw on the VMs which would expose the host to ssh brute-force attacks from the Internet.
You basically use the Nagios plugins to create an ssh service check for these hosts.
Here is how my ssh service is setup:
You then create an alert rule to throw an alert if the service is in OK state ( services.service_status = 0). Here’s my alert rule for this:
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