A load balancer heartbeat / health checker url, and also a configurable nagios compliant cron health checker. This should out of the box with most load balancers, eg Amazon ELB, F5, HA proxy etc as most of these simply check the http status for 200 or non-200 response codes.
Nagios is a popular open source computer system and network monitoring software application. It watches hosts and services, alerting users when things go wrong and again when they get better. Nagios offers complete monitoring and alerting for servers, switches, applications, and services.There are plenty of ways you can monitor a server using nagios for example through ssh, nrpe or snmp. In this blog post I will be explaining monitoring parameters of an Ubuntu server running Moodle.
פורסם ב: Monitoring moodle server with nagios.
בנוסף, תוסף מקומי למוודל אשר מאפשר ניטור של תהליכים ושרותים פנימיים במופע מוודל כלשהו: https://github.com/pauln/local_nagios