Check out this O'Rielly article. The new netsaint. :)

http://www.onlamp.com/lpt/a/2787

Eric R. wrote:

> admin@kclinux.net wrote:
>
>> Anyone know of a linux script that will monitor a server and will 
>> send an
>> email when something is down?  For example, makes sure the server is up
>> (PING), makes sure webpages come up (APACHE), and so on.  If it's down,
>> maybe send a custom error to an email address. (A Mobil Phone pager)
>>
>>
>>
>>
>>
>
> NetSaint fit the bill for us here.  I believe it's depracated at this 
> point, but it works great, and meets the requirements you listed.
>
> thanks,
> Eric
>
>
>