book

Nagios Core Administration Cookbook Second Edition - Second Edition

Name: Nagios Core Administration Cookbook Second Edition - Second Edition
Author: Tom Ryder
ISBN: 9781785889332

by Tom Ryder

February 2016

Intermediate to advanced

386 pages

8h 57m

English

Packt Publishing

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Nagios Core Administration Cookbook Second Edition
Table of Contents
Nagios Core Administration Cookbook Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
eBooks, discount offers, and moreWhy Subscribe?
Preface
What this book covers
What you need for this book
Who this book is for

Sections
Getting readyHow to do it…How it works…There's more…See also
Conventions
Reader feedback
Customer support
Downloading the example codeErrataPiracyQuestions
1. Understanding Hosts, Services, and Contacts
Introduction
Creating a new network host
Getting readyHow to do it...How it works...There's more...See also
Creating a new HTTP service
Getting readyHow to do it...How it works...There's more...See also
Creating a new e-mail contact
Getting readyHow to do it...How it works...There's more...See also
Verifying configuration
Getting readyHow to do it...How it works...There's more...See also
Creating a new hostgroup
Getting readyHow to do it...How it works...There's more...See also
Creating a new servicegroup
Getting readyHow to do it...How it works...There's more...See also
Creating a new contactgroup
Getting readyHow to do it...How it works...There's more...See also
Creating a new time period
Getting readyHow to do it...How it works...There's more...See also
Running a service on all hosts on a group
Getting readyHow to do it...How it works...There's more...See also
2. Working with Commands and Plugins
Introduction
Finding a plugin
Getting readyHow to do it...How it works...There's more...See also
Installing a plugin
Getting readyHow to do it...How it works...There's more...See also
Removing a plugin
Getting readyHow to do it...How it works...There's more...See also
Creating a new command
Getting readyHow to do it...How it works...There's more...See also
Customizing an existing command
Getting readyHow to do it...How it works...There's more...See also
Using an alternative check command for hosts
Getting readyHow to do it...How it works...There's more...See also
Writing a new plugin from scratch
Getting readyHow to do it...How it works...There's more...See also
Implementing threshold checks in a plugin
Getting readyHow to do it...How it works...There's more...See also
Using macros as environment variables in a plugin
Getting readyHow to do it…How it works...There's more...See also
3. Working with Checks and States
Introduction
Specifying how frequently to check a host or service
Getting readyHow to do it...How it works...There's more...See also
Changing thresholds for PING RTT and packet loss
Getting readyHow to do it...How it works...There's more...See also
Changing thresholds for disk usage
Getting readyHow to do it...How it works...There's more...See also
Scheduling downtime for a host or service
Getting readyHow to do it...How it works...There's more...See also
Managing brief outages with flapping
Getting readyHow to do it...How it works...There's more...See also
Adjusting flapping percentage thresholds for a service
Getting readyHow to do it...How it works...There's more...See also
4. Configuring Notifications
Introduction
Configuring notification periods
Getting readyHow to do it...How it works...There's more...See also
Configuring notifications for groups
Getting readyHow to do it...How it works...There's more...See also
Choosing states for notification
Getting readyHow to do it...How it works...There's more...See also
Specifying the number of failed checks before notification
Getting readyHow to do it...How it works...There's more...See also
Automating contact rotation
Getting readyHow to do it...How it works...There's more...See also
Defining an escalation for repeated notifications
Getting readyHow to do it...How it works...There's more...See also
Defining a custom notification method
Getting readyHow to do it...How it works...There's more...See also
Filtering notifications based on a host or service value
Getting readyHow to do it...How it works...There's more...See also
5. Monitoring Methods
Introduction
Monitoring PING for any host
Getting readyHow to do it...How it works...There's more...See also
Monitoring SSH for any host
Getting readyHow to do it...How it works...There's more...See also
Checking an alternative SSH port
Getting readyHow to do it...How it works...There's more...See also
Monitoring mail services
Getting readyHow to do it...How it works...There's more...See also
Monitoring web services
Getting readyHow to do it...How it works...There's more...See also
Checking that a website returns a given string
Getting readyHow to do it...How it works...There's more...See also
Monitoring database services
Getting readyHow to do it...How it works...There's more...See also
Monitoring the output of an SNMP query
Getting readyHow to do it...How it works...There's more...See also
Monitoring a RAID or other hardware device
Getting readyHow to do it...How it works...See also
Creating an SNMP OID for monitoring
Getting readyHow to do it...How it works...There's more...See also
6. Enabling Remote Execution
Introduction
Monitoring local services on a remote machine with NRPE
Getting readyHow to do it...How it works...There's more...See also
Setting the listening address for NRPE
Getting readyHow to do it...How it works...See also
Setting allowed client hosts for NRPE
Getting readyHow to do it...How it works...There's more...See also
Creating new NRPE command definitions securely
Getting readyHow to do it...How it works...There's more...See also
Giving limited sudo(8) privileges to NRPE
Getting readyHow to do it...How it works...There's more...See also
Using check_by_ssh with key authentication instead of NRPE
Getting readyHow to do it...How it works...There's more...See also
Using check_mk instead of NRPE
Getting readyHow to do it...How it works...There's more...See also
7. Using the Web Interface
Introduction
Using the Tactical Overview
Getting startedHow to do it...How it works...There's more...See also
Viewing and interpreting availability reports
Getting startedHow to do it...How it works...There's more...See also
Viewing and interpreting trends
Getting startedHow to do it...How it works...There's more...See also
Viewing and interpreting notification history
Getting startedHow to do it...How it works...There's more...See also
Adding comments on hosts or services in the web interface
Getting startedHow to do it...How it works...There's more...See also
Viewing configuration in the web interface
Getting startedHow to do it...How it works...There's more...See also
Scheduling checks from the web interface
Getting startedHow to do it...How it works...There's moreSee also
Acknowledging a problem via the web interface
Getting startedHow to do it...How it works...There's more...See also
8. Managing Network Layout
Introduction
Creating a network host hierarchy
Getting readyHow to do it…How it works…There's more…See also
Using the network map
Getting readyHow to do it…How it works…There's more…See also
Choosing icons for hosts
Getting readyHow to do it…How it works…There's more…See also
Establishing a host dependency
Getting readyHow to do it…How it works…There's more…See also
Establishing a service dependency
Getting readyHow to do it…How it works…There's more…See also
Monitoring individual nodes in a cluster
Getting readyHow to do it…How it works…There's more…See also
Using the network map as an overlay
Getting readyHow to do it…How it works…There's more…See also
9. Managing Configuration
Introduction
Grouping configuration files in directories
Getting readyHow to do it…How it works…There's more…See also
Keeping a configuration under version control
Getting readyHow to do it…How it works…There's more…See also
Configuring host roles using groups
Getting readyHow to do it…How it works…There's more…See also
Building groups using regular expressions
Getting readyHow to do it…How it works…There's more…See also
Using inheritance to simplify configuration
Getting readyHow to do it…How it works…There's more…See also
Defining macros in a resource file
Getting readyHow to do it…How it works…There's more…See also
Using another object's directives in a host or service check
Getting readyHow to do it…How it works…There's more…See also
Using custom directives
Getting readyHow to do it…How it works…There's more…See also
Dynamically building host definitions
Getting readyHow to do it…How it works…There's more…See also
10. Security and Performance
Introduction
Using authentication for the Nagios Core web interface
Getting readyHow to do it...How it works...There's more...See also
Using authenticated contacts
Getting readyHow to do it...How it works...There's more...See also
Writing debugging information to the Nagios log file
Getting readyHow to do it...How it works...There's more...See also
Monitoring Nagios performance with nagiostats
Getting readyHow to do it...How it works...There's more...See also
Setting up a redundant monitoring host
Getting readyHow to do it...How it works...There's more...See also
11. Automating and Extending Nagios Core
Introduction
Allowing and submitting passive checks
Getting readyHow to do it...How it works...There's more...See also
Submitting passive checks from a remote host with NSCA
Getting readyHow to do it...How it works...There's more...See also
Submitting passive checks in response to SNMP traps
Getting readyHow to do it...How it works...There's more...See also
Setting up an event handler script
Getting readyHow to do it...How it works...There's more...See also
Tracking host and service states with Nagiosgraph
Getting readyHow to do it...How it works...There's more...See also
Reading status in a MySQL database with NDOUtils
Getting readyHow to do it...How it works...There's more...See also
Reading status from a Unix socket with MK Livestatus
Getting readyHow to do it...How it works...There's more...See also
Writing customized Nagios Core reports
Getting readyHow to do it...How it works...See also
Getting extra visualizations with NagVis
Getting readyHow to do it...How it works...There's more...See also
Writing custom Nagios Core management scripts
Getting readyHow to do it...How it works...There's more...See also
Index

Content preview from Nagios Core Administration Cookbook Second Edition - Second Edition

Implementing threshold checks in a plugin

You'll note that many of the plugins included in the Nagios Plugins set allow you to specify thresholds for different aspects of the tests that they perform, allowing custom configuration of which levels are ok, which need a warning, and which are critical. For example, the check_ping plugin requires us to specify thresholds with -w and -c options that define limits for round-trip-time and packet loss:

$ /usr/local/nagios/libexec/check_ping -H 192.0.2.21 -w 100,20% -c 200,40%
PING OK - Packet loss = 0%, RTA=0.20 ms|rta=0.200000ms;100.000000;100.000000;0.000000 pl=0%;10;20;0

In this case, the plugin's options are set only to raise a WARNING state if the round-trip-time for the check exceeds 100 milliseconds ...

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Nagios Core Administration Cookbook Second Edition - Second Edition

by Tom Ryder

Implementing threshold checks in a plugin

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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