Nagios is a system and network monitoring application. It watches hosts and services that you specify,alerting you when things go bad and when they get better. Nagios was originally designed to run under Linux, although it should work under most other unices as well. Nagios is licensed under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation. This gives you legal permission to copy, distribute and/or modify it under certain conditions.
Some of the many Features of Nagios include:
1) Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
2) Monitoring of host resources (processor load, disk usage, etc.)
3) Simple plugin design that allows users to easily develop their own service checks.
4) Parallelized service checks.
4) Ability to define network host hierarchy using "parent" hosts, allowing detection of and
distinction between hosts that are down and those that are unreachable.
5) Contact notifications when service or host problems occur and get resolved (via email,
pager, or user-defined method) .
6) Ability to define event handlers to be run during service or host events for proactive
problem resolution.
7) Automatic log file rotation.
8) Support for implementing redundant monitoring hosts.
9) Optional web interface for viewing current network status, notification and problem
history, log file, etc.
System Requirements :
The only requirement of running Nagios is a machine running Linux (or UNIX variant) and a C compiler. You will probably also want to have TCP/IP configured, as most service checks will be performed over the network.
You are not required to use the CGIs included with Nagios. However, if you do decide to use them, you will need to have the following software installed...
1) A web server (preferrably Apache).
2) Thomas Boutell’s gd library version 1.6.3 or higher (required by the statusmap and
trends CGIs)
Downloading The Latest Version
You can check for new versions of Nagios at http://www.nagios.org.
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