Nagios Core is an Open Source 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 Core was originally designed to run under Linux, although it should work under most other unices as well.
FEATURES OF NAGIOS CORE:
- Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
- Monitoring of host resources (processor load, disk usage, etc.)
- Simple plug-in design that allows users to easily develop their own service checks
- Paralleled service checks
- Ability to define network host hierarchy using "parent" hosts, 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 user-defined method)
- Ability to define event handlers to be run during service or host events for proactive problem resolution
- Automatic log file rotation
- Support for implementing redundant monitoring hosts
- Optional web interface for viewing current network status, notification and problem history, log file, etc.
DIAGRAM OF NAGIOS CORE (SERVER):
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