Monit

apt-get install monit
mkdir /etc/monit.d/
echo set alert banto@localhost >> /etc/monit/monitrc
echo include /etc/monit.d/* >> /etc/monit/monitrc
echo startup=1 > /etc/default/monit
echo CHECK_INTERVALS=180 >> /etc/default/monit
wget http://pub.nkosi.org/apache2.monit
mv apache2.monit /etc/monit.d/
/etc/init.d/monit start

mais instruções:

set httpd port 2812 and
        use address localhost
        allow localhost
        allow 192.168.0.0/255.255.255.0
        allow admin:monit

check system localhost
        if loadavg (1min) > 4 then alert
        if loadavg (5min) > 2 then alert
        if memory usage > 75% then alert
        if cpu usage (user) > 70% then alert
        if cpu usage (system) > 30% then alert
        if cpu usage (wait) > 20% then alert

fcgiwrap

cp /usr/share/doc/fcgiwrap/examples/monitrc /etc/monit/conf.d/fcgiwra

referências

• http://mmonit.com/
• http://mmonit.com/monit/documentation/monit.html
• http://reductivelabs.com/trac/puppet/wiki/Recipes/Monit
• http://fosscasts.com/screencasts/6-System-Monitoring-With-Monit.html
• http://rimuhosting.com/knowledgebase/applications/monit-service-monitoring