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Learning Nagios 4

Learning Nagios 4

By : Wojciech Kocjan
4.2 (10)
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Learning Nagios 4

Learning Nagios 4

4.2 (10)
By: Wojciech Kocjan
Buy this Book

Overview of this book

Table of Contents (19 chapters)
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Learning Nagios 4
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Learning Nagios 4
Credits
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Credits
About the Author
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About the Author
About the Reviewers
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About the Reviewers
www.PacktPub.com
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www.PacktPub.com
Preface
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Preface
Lock Free Chapter
1
Introducing Nagios
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Introducing Nagios
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Understanding the basics of Nagios
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Soft and hard states
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What's new in Nagios 4.0
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Summary
2
Installing Nagios 4
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Installing Nagios 4
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Installation
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Configuring Nagios
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Summary
3
Using the Nagios Web Interface
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Using the Nagios Web Interface
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Setting up the web interface
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Using the web interface
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Managing hosts
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Managing services
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Managing downtime
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Managing comments
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Nagios information
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Generating reports
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Changing the look of the Nagios web interface
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Third-party Nagios web interfaces
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Summary
4
Using the Nagios Plugins
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Using the Nagios Plugins
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Understanding how checks work
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Monitoring using the standard network plugins
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Monitoring the e-mail servers
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Monitoring network services
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Monitoring the database systems
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Monitoring the storage space
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Monitoring the resources
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Monitoring other operations
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Additional and third-party plugins
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Summary
5
Advanced Configuration
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Advanced Configuration
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Creating maintainable configurations
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Configuring the file structure
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Defining the dependencies
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Using the templates
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Using the custom variables
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Understanding flapping
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Summary
6
Notifications and Events
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Notifications and Events
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Creating effective notifications
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Understanding escalations
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Sending commands to Nagios
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Creating event handlers
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Using adaptive monitoring
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Summary
7
Passive Checks and NSCA
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Passive Checks and NSCA
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Understanding passive checks
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Using NSCA
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Summary
8
Monitoring Remote Hosts
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Monitoring Remote Hosts
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Monitoring over SSH
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Monitoring using NRPE
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Comparing NRPE and SSH
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Alternatives to SSH and NRPE
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Summary
9
Monitoring using SNMP
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Monitoring using SNMP
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Introducing SNMP
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Working with SNMP and MIB
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Setting up an SNMP agent
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Using SNMP from Nagios
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Summary
10
Advanced Monitoring
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Advanced Monitoring
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Monitoring Windows hosts
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Understanding distributed monitoring
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Using templates for distributed monitoring
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Summary
11
Programming Nagios
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Programming Nagios
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Introducing Nagios customizations
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Programming in C with libnagios
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Creating custom active checks
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Checking websites
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Virtualization and clouds
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Writing commands to send notifications
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Managing Nagios
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Summary
12
Using the Query Handler
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Using the Query Handler
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Introducing the query handler
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Using the core service
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Introducing Nagios Event Radio Dispatcher
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Summary
1
Index
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Index

Monitoring the resources

For servers or workstations to be responsive and to be kept from being overloaded, it is also worth monitoring system usage using various additional measures. Nagios offers several plugins to monitor resource usage and to report if the limits set for these checks are exceeded.

Checking the system load

The first thing that should always be monitored is the system load, and it is calculated based on count of processes running or waiting to run. This value reflects the number of processes and the amount of CPU capacity that they are utilizing. This means that if one process is using up to 50 percent of the CPU capacity, the value will be around 0.5. And if four processes try to utilize the maximum CPU capacity, the value will be around 4.0. The system load is measured in three values: the average loads in the last minute, last 5 minutes, and the last 15 minutes. The syntax of the command is as follows:

check_load [-r] –w wload1,wload5,wload15 –c cload1,cload5,cload15...
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Learning Nagios 4
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