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Learning Nagios 4

By : Wojciech Kocjan
Book Image

Learning Nagios 4

By: Wojciech Kocjan

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Learning Nagios 4
Wojciech Kocjan
Mar, 2014 | 400 pages
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Table of Contents (19 chapters)
Learning Nagios 4
Learning Nagios 4
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introducing Nagios
Introducing Nagios
Understanding the basics of Nagios
Soft and hard states
What's new in Nagios 4.0
Summary
2
Installing Nagios 4
Installing Nagios 4
Installation
Configuring Nagios
Summary
3
Using the Nagios Web Interface
Using the Nagios Web Interface
Setting up the web interface
Using the web interface
Managing hosts
Managing services
Managing downtime
Managing comments
Nagios information
Generating reports
Changing the look of the Nagios web interface
Third-party Nagios web interfaces
Summary
4
Using the Nagios Plugins
Using the Nagios Plugins
Understanding how checks work
Monitoring using the standard network plugins
Monitoring the e-mail servers
Monitoring network services
Monitoring the database systems
Monitoring the storage space
Monitoring the resources
Monitoring other operations
Additional and third-party plugins
Summary
5
Advanced Configuration
Advanced Configuration
Creating maintainable configurations
Configuring the file structure
Defining the dependencies
Using the templates
Using the custom variables
Understanding flapping
Summary
6
Notifications and Events
Notifications and Events
Creating effective notifications
Understanding escalations
Sending commands to Nagios
Creating event handlers
Using adaptive monitoring
Summary
7
Passive Checks and NSCA
Passive Checks and NSCA
Understanding passive checks
Using NSCA
Summary
8
Monitoring Remote Hosts
Monitoring Remote Hosts
Monitoring over SSH
Monitoring using NRPE
Comparing NRPE and SSH
Alternatives to SSH and NRPE
Summary
9
Monitoring using SNMP
Monitoring using SNMP
Introducing SNMP
Working with SNMP and MIB
Setting up an SNMP agent
Using SNMP from Nagios
Summary
10
Advanced Monitoring
Advanced Monitoring
Monitoring Windows hosts
Understanding distributed monitoring
Using templates for distributed monitoring
Summary
11
Programming Nagios
Programming Nagios
Introducing Nagios customizations
Programming in C with libnagios
Creating custom active checks
Checking websites
Virtualization and clouds
Writing commands to send notifications
Managing Nagios
Summary
12
Using the Query Handler
Using the Query Handler
Introducing the query handler
Using the core service
Introducing Nagios Event Radio Dispatcher
Summary
Index
Index

Writing commands to send notifications

Another part of Nagios that can be extended to fit your needs are notifications. These are messages that Nagios sends out whenever a problem occurs or is resolved.

One way in which Nagios' notification system can be expanded is to create template-based e-mails. These will send notifications as both plain text and HTML messages. The template of the e-mail will be kept in separate files.

We will use Tcl for this purpose as it contains libraries for MIME (http://tcllib.sourceforge.net/doc/mime.html) and SMTP (http://tcllib.sourceforge.net/doc/smtp.html) functionality. The first one allows the creation of structured e-mails, whereas the latter one is used to send these using an SMTP server.

E-mails that contain content in multiple formats need to be wrapped in the multipart/alternative MIME type. This type will contain two subparts: first the plain text version and then the HTML version. This order makes e-mail clients choose HTML over plain text if both the...

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