Learning Nagios - Third Edition电子书

Learning Nagios - Third Edition

Learning Nagios - Third Edition

Credits

About the Authors

About the Reviewer

www.PacktPub.com

eBooks, discount offers, and more

Why subscribe?

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Introducing Nagios

Understanding the basics of Nagios

Introducing plugins

Benefits of monitoring

Main features

Soft and hard states

Summary

2. Installing Nagios 4

Installing Nagios

Upgrading from previous versions

Performing installation with automated script

Installing Nagios using package managers

Installation with apt-get/dpkg

Installation with yum/rpm

Compiling Nagios from source code manually

Installing prerequisites

Setting up users, groups, and directories

Obtaining Nagios and Nagios plugins

Compiling and installing Nagios

Compiling and installing Nagios plugins

Setting up a web server

Troubleshooting the web server

Running Nagios using virtualizations

Running Nagios inside containers

Installing Nagios inside virtual machines

Summary

3. Configuring Nagios

Configuring Nagios

Understanding macro definitions

Configuring hosts

Configuring host groups

Configuring services

Configuring service groups

Configuring commands

Configuring time periods

Configuring contacts

Configuring contact groups

Verifying the configuration

Understanding notifications

Using inheritance and templates

Summary

4. Using the Built-in Web Interface

The Nagios web interface

Accessing the web interface

Using the web interface

Checking the tactical overview

Viewing the status map

Managing hosts

Checking status

Viewing host information

Managing services

Checking status

Viewing service information

Managing downtimes

Checking downtimes statuses

Scheduling downtimes

Managing comments

Nagios information

Viewing process information

Checking performance information

Generating reports

Changing the look of the Nagios web interface

Summary

5. Using Additional Interfaces

Introducing third-party web interfaces

Using Nagios dashboards

Installing alternative Nagios web interfaces

Viewing performance data with nagiosgraph

Learning command-line interfaces

Using nagios_commander

Interacting with nagios-cli

Using mobile applications to check the Nagios status

Checking the status on iOS with easyNag

Working with Nagios on Android using aNag

Checking the status on Windows Phone with NagChecker

Summary

6. Using the Nagios Plugins

Understanding checks in Nagios

Using standard network plugins

Testing the connection to a remote host

Testing connectivity using TCP and UDP

Monitoring e-mail servers

Checking POP3 and IMAP servers

Testing SMTP protocol

Monitoring network services

Checking FTP server

Verifying DHCP protocol

Monitoring Nagios processes

Testing websites

Monitoring database systems

Checking MySQL

Checking PostgreSQL

Checking Oracle

Checking other databases

Monitoring storage space

Checking swap space

Monitoring disk status SMART

Checking disk space

Testing free space for remote shares

Monitoring resources

Checking system load

Checking processes

Monitoring logged-in users

Monitoring other operations

Checking for updates with APT

Monitoring UPS status

Gathering information from LM sensors

Using the dummy check plugin

Manipulating other plugins' output

Additional and third-party plugins

Monitoring network software

Using third-party plugins

Summary

7. Advanced Configuration

Creating maintainable configurations

Configuring the file structure

Defining object dependencies

Creating host dependencies

Creating service dependencies

Using templates

Creating templates

Inheriting from multiple templates

Using the custom variables

Understanding state flapping

Summary

8. Notifications and Events

Creating effective notifications

Using multiple notifications

Sending instant messages via Jabber

Notifying users with text messages

Integrating with HipChat

Slack integration

Understanding escalations

Setting up escalations

Understanding how escalations work

Sending commands to Nagios

Adding comments to hosts and services

Scheduling host and service checks

Modifying custom variables

Creating event handlers

Restarting services automatically

Modifying notifications

Using adaptive monitoring

Summary

9. Passive Checks and NRDP

Understanding passive checks

Introducing active and passive checks

Configuring passive checks

Sending passive check results for hosts

Sending passive check results for services

Troubleshooting errors

Using NRDP

Installing the NRDP server

Using the NRDP client

Securing the NRDP communication

Summary

10. Monitoring Remote Hosts

Monitoring over SSH

Configuring the SSH connection

Using the check_by_ssh plugin

Performing multiple checks

Troubleshooting the SSH-based checks

Monitoring using NRPE

Obtaining NRPE

Compiling NRPE

Configuring the NRPE server

Registering NRPE check commands

Configuring Nagios for NRPE

Using command arguments with NRPE

Troubleshooting NRPE

Comparing NRPE and SSH

Alternatives to SSH and NRPE

Summary

11. Monitoring Using SNMP

Introducing SNMP

Understanding data objects

Working with SNMP and MIB

Using graphical tools

Setting up an SNMP agent

Using SNMP from Nagios

Receiving traps

Using additional plugins

Summary

12. Advanced Monitoring

Monitoring Windows machines

Installing NSClient++

Configuring NSClient++

Monitoring Windows using check_nt

Performing checks using NRPE protocol

Querying WMI data from Nagios

Implementing external scripts

Understanding distributed monitoring

Introducing obsessive notifications

Configuring Nagios instances

Performing freshness checking

Using templates for distributed monitoring

Creating the host and service objects

Customizing checks with custom variables

Summary

13. Programming Nagios

Introducing Nagios customizations

Creating custom active checks

Testing MySQL database correctness

Monitoring local time against a time server

Writing plugins the right way

Checking websites

Writing commands to send notifications

Managing Nagios

Using passive checks

Introducing the query handler

Communicating with the query handler

Using the query handler programmatically

Using the core service

Introducing the Nagios event radio dispatcher

Summary