Nagios Installation
Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It has been designed to run under the Linux operating system, but works fine under most variants as well. The monitoring daemon runs intermittent checks on hosts and services you specify using external plugins which return status information to Nagios.
When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.) Having a Nagios installation on your server will help improve your server reliability.
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.)
Monitoring of environmental factors such as temperature
Scheduled downtime for suppressing host and service notifications during periods of planned outages
Simple plugin design that allows users to easily develop their own host and service checks
Ability to define network host hierarchy, allowing detection of and distinction between hosts that are down and those that are unreachable
Support for implementing redundant and distributed monitoring servers
Ability to acknowledge problems via the web interface
Contact notifications when service or host problems occur and get resolved (via email, pager, or other user-defined method)
Optional escalation of host and service notifications to different contact groups
Ability to define event handlers to be run during service or host events for proactive problem resolution
External command interface that allows on-the-fly modifications to be made to the monitoring and notification
behavior through the use of event handlers, the web interface, and third-party applications
Retention of host and service status across program restarts
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