Nagios Monitoring
Nagios is a free, open-source tool that can be used to monitor network components and services. When it detects a problem, it can send alert messages by either e-mail or pager. It can also be configured so that only designated personnel can view status information for particular services or equipment. Preview a Linux Course

Documentation - 500 pages of Training - The manual contains Labs that help students work through the set up step-by-step for each of the monitoring options they want to use.
Labs - The labs are provided to give students an immediate assessment and step-by-step references on how to set up, maintain, and secure a Nagios server.
Nagios Image - The VMWare image will have a working Nagios Server as an example for students to use.
Live Virtual Classroom - Students will have one-on-one sessions with an instructor to demonstrate server configuration allowing students to ask questions. These virtual classrooms allow students to talk to the instructor using our voice server and allow them to watch live demonstrations on a live server.
Live Practice Server - Students are provided a server to work on during the class and will have root access so that they can build a Nagios Server. The instructor will then login and evaluate the server and verify the student's settings. Each student will be provided a CentOS practice server for 5 weeks.

Monitoring of Network Services - Nagios will allow you to monitor services that you run on your servers like SMTP, POP3, HTTP, NNTP, PING, and others. This will provide information on their status and load.
Monitoring of Host Resources - Nagios will allow you to monitor processor load, disk and memory usage, running processes, log files, etc.
Monitoring of Environmental Factors - You will be able to monitor temperature changes and problems with Nagios.
Nagios Basic Configuration - Students will set up a Nagios server and learn how to monitor services and hosts.
Monitor Linux Servers - Configure Nagios to monitor Linux services and hosts with NRPE.
Monitor Windows Servers - Configure Nagios to monitor Windows services and hosts with NRPE.
Contact Notifications - Contact support with email or pager when service or host problems occur.
SNMP Monitoring for Switches and Routers - Learn how to design and implement SNMP for monitoring routers and switches and the network bandwidth they use.
Create Charts with MRTG - Use the information from Nagios to create charts of traffic with MRTG.
Monitor with SSH - Use SSH to monitor Linux boxes to create secure data transfer.
Monitor Multiple Checks with One Connection - Using the check_multi plugin you can monitor many services with one connection saving bandwidth.
Implement Redundant and Distributed Monitoring - 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
Schedule Downtime for Limiting Notifications - During planned outages you can schedule in that time.
Passive Monitoring - Learn how to set up Passive Monitoring where the client sends the informaton to the Nagios server. This is commonly implemented when you have a firewall that will not allow Nagios access.
Access Web Interface - The web interface provides a summary of status and issues on each server.
Multple Levels of Authentication for the Web Interface