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What tool do you use to monitor your servers?

I noticed my website only got 8 visitors today, which means it probably went down very early this morning and I never noticed. Why it went down is another story.

Ideally, I'd like to be emailed if my web server becomes unresponsive or does not return an HTTP 200.

Is there either a cloud-based service (either free or pretty cheap) that can monitor your website?

If not, is there a good free/open source program I can run on either a Linux or Windows machine that will monitor a website and email me if it goes down? Thanks!

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marked as duplicate by EEAA, mgorven, quanta, stew, Ward Jun 8 '12 at 4:43

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If you're after external, third-party services, Pingdom and HostTracker are well known in this arena. There are probably many others. They can email or SMS you. –  Ladadadada Jun 8 '12 at 5:49
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1 Answer

up vote 1 down vote accepted

There are many. A couple local utilities that come to mind
- WhatsUp
- Nagios
- Zenoss

I'd recommend the first to start assuming you have a Windows workstation. The others are Linux installs and likely overkill (not because of Linux, they just do a LOT more)

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