I'm looking for a free server monitoring software. Basically, I want to know if a server has lost power or is in a down state. I guess what i'm asking for is something that will sent a "PING" every once in a while to check if it's still up and running.

This is in a Windows Domain environment, but I can run the app on Windows or Linux. It really doesn't matter to me.

Maybe, something with a web interface or an app that runs on a single server that I can login to would be fine.

Thanks,

Webmin has a monitoring module. Seems to work very well. Sends an email when a daemon goes down. Overhead seems low,

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Loads of things you can use, but if you're wanting to monitor this ONE THING now, chances are good you've set foot on a slippery slope that will wind up being, "Y'know, since we're monitoring THIS, can we monitor XXX and YYY...as well??"

For your use-case now, a simple bash script that sleeps for X minutes and sends a ping is all you'd need. But I'd suggest something like Nagios or Zabbix, so you can monitor the network hardware as well. Getting an alert that a server is down at dark-O-thirty in the morning isn't good, but getting it because the network switch went down (which may be someone elses problem) is even worse. Being able to do SNMP monitoring pretty easily, poking switches/disk space/memory is a good thing. And it gives you a central web-accessible interface.

I've used Prometheus for this (and a lot more), with a Grafana front-end.

There are other options listed in their comparison to alternatives documentation.

munin does what I need.

I used monit to montior web applications and restart them if they're not responding. It works quite well.

When one of my previous employers was started using Nagios for their large network, getting 27 pages about servers in a remote data center were common. Then I added the network gear to the monitoring. (Our network team wasn't happy about our monitoring their gear -- gotta love office politics -- and I had to have the server admins give the server's IP address as well as their default route when setting up their monitoring.) If a router went down, the Nagios alert rules made sure the network team got the alert, not the server admins whose systems were behind the downed network box.

I found it pretty nice to be able to have Nagios checking for "XXX" and "YYY". It was a pity when the company outsourced everything to a 3rd party data center provider and Nagios was replaced with something that was only set up to ping.

Centreon - https://www.centreon.com/en/open-source/

Fork of Nagios, binary compatible, has a very nice GUI for configuration.

Currently monitoring 431 hosts and 4600+ services with it.