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How to set up server monitoring system with Monit

Many Linux admins rely on a centralized remote monitoring system (e.g., Nagios or Cacti) to check the health of their network infrastructure. While centralized monitoring makes an admin’s life easy when dealing with many hosts and devices, a dedicated monitoring box obviously becomes a single point of failure; if the monitoring box goes down or becomes unreachable for whatever reason (e.g., bad hardware or network outage), you will lose visibility on your entire infrastructure.