moint is a fantastic utility that can be installed on Linux or Mac OS X and provides the ability to monitor services running on your server.  These could be apache, mysql, bind or any other service you need to be up and running.  After installing monit, you create a config file containing information about the services you want to monitor.  Monit with then dutifully monitor the service, and email you if they go down.  You can even configure it to restart the service if it fails.

Running on top of monit is m/monit, which is a web based service which pools information from all your servers running monit and provides information in a easily accessable format on a web page.  You can use this as your monitoring station for your website for instance, as it also includes information such as load average, disk usage and uptime - in addition to the services you are monitoring.

Highly recommended.

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