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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

Configuring Nagios

Nagios stores it's configuration in a separate directory. Usually it's either in /etc/nagios or /usr/local/etc/nagios. If you followed the steps for manual installation, it's in /etc/nagios. We will now configure Nagios so that it is ready for use. While it will not be easy to check the results right away, we will verify that the configuration itself is valid. Chapter 3, Using the Nagios Web Interface, talks about setting up the Nagios web interface, which will allow us to check the status of the host and services that we will create in this section.

Creating the main configuration file

The main configuration file is called nagios.cfg, and it is the main file that is loaded during Nagios startup. Its syntax is simple, a line beginning with # is a comment, and all lines in the form of <parameter>=<value> set a value. In some cases, a value might be repeated (like specifying additional files/directories to read). The following is a sample of the Nagios main configuration...

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Learning Nagios 4
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