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 is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.).
It has been designed to run under the Linux operating system, but works fine under most *NIX variants as well. The monitoring daemon runs intermittent checks on hosts and services you specify using external 'plugins' which return status information to Nagios.. 
Nagios has a lot of features, making it a very powerful monitoring tool. Some of the major features are listed below:
- Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
- Monitoring of host resources (processor load, disk and memory usage, running processes, log files, etc.)
- Simple plugin design that allows users to easily develop their own host and service checks
- Ability to define event handlers to be run during service or host events for proactive problem resolution.
- Ability to define network host hierarchy, allowing detection of and distinction between hosts that are down and those that are unreachable.
- Contact notifications when service or host problems occur and get resolved (via email, pager, or other user-defined method))
- Ability to define event handlers to be run during service or host events for proactive problem resolution
- Retention of host and service status across program restarts
- Support for implementing redundant and distributed monitoring servers
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