Nagios — An Open-source Computer Software That Monitors System And Networks

Definition: Nagios is an open-source software which monitors critical IT infrastructure components, including system metrics, network protocols, applications, services, servers, and network infrastructure. It was originally designed to run under Linux, but it also runs well on other Unix.

• It alerts users two times firstly when things go wrong and the second time when the problem has been resolved.
• It Monitor many network services like(SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH).
• It also Monitor host resources like(processor load, disk usage, system logs).
• It Monitor remotely run scripts via Nagios Remote Plugin Executor.
• It provides a simple plugin design by which users can easily develop their own service checks whatever they need.
• It also provides data graphing plugins.
• It enables automatic log file rotation.
• It also provides event handlers so that the problem will be resolved proactively when service or host events are running.
• It provides an optional web-interface by which we can easily know about current network status, notifications, problem history, log files, etc.
• It provides data storage via text files rather than the database.