A very simple host is alive
solution written in Bash for monitoring multiple
hosts.
Proof of Concept ;-)
mkdir /etc/websafe
cd /etc/websafe
git clone git://github.com/websafe/hostbeat.git
cp /etc/websafe/hostbeat/cron.d/websafe-hostbeat /etc/cron.d/
and restart crond
service cron restart
or
/etc/rc.d/rc.crond restart
cd /etc/websafe/hostbeat/ && git pull