http://www.master.com offers a free service that will poll a server now
and then and send you an email if it does not respond. It also gives a
graph of response time over time. Other services include a site search
engine, web forum, news, etc.

Not quite the same as a server based monitor, but it DOES let you know
when the system is down.

Years ago I installed a script that watches the load on the server (I'd
have to search a bit to find it). At that time I was having trouble with
Apache now and then running the CPU load to 50 or above. The system pretty
much became unresponsive. I added that script to send me an email once the
CPU load got to one level, then restart Apache if it got above another
level. Of course, once I installed the script (several years ago), the
problem pretty much went away. It MIGHT have been a DOS attack. I've also
got sshblack running to block IP addresses that fail ssh login, fail http
authentication, attempt to spam the wiki (the spammers tend to use the
same URL to spam), or attempt to run MSWORD (on the linux server!). There
are now several thousand IP addresses blocked, and I have not had a
problem with excessive CPU load.

Anyway, master.com might be worth a look.

Harold




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