Complete monitoring and alerting for servers, switches, applications, and services
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Why people like Nagios
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Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License.

Nagios's Features
  • Monitor your entire IT infrastructure
  • Spot problems before they occur
  • Know immediately when problems arise
  • Share availability data with stakeholders
  • Detect security breaches
  • Plan and budget for IT upgrades
  • Reduce downtime and business losses