You are previewing Nagios, 2nd Edition.

Nagios, 2nd Edition

Cover of Nagios, 2nd Edition by Wolfgang Barth Published by No Starch Press
  1. Nagios: System and Network Monitoring, 2nd Edition
    1. Foreword to the second edition
      1. What's New in the Second Edition?
      2. Information Sources on the Internet
    2. Introduction
      1. The tests
      2. The suppliers of information
      3. Keeping admins up-to-date
      4. Taking in information from outside
      5. Other tools for network monitoring
      6. About This Book
      7. Further notes on the book
      8. Note of Thanks
    3. I. From Source Code to a Running Installation
      1. 1. Installation
      2. 2. Nagios Configuration
      3. 3. Startup
    4. II. In More Detail...
      1. 4. Nagios Basics
      2. 5. Service Checks and How They Are Performed
      3. 6. Plugins for Network Services
      4. 7. Testing Local Resources
      5. 8. Plugins for Special Tasks
      6. 9. Executing Plugins via SSH
      7. 10. The Nagios Remote Plugin Executor (NRPE)
      8. 11. Collecting Information Relevant for Monitoring with SNMP
      9. 12. The Nagios Notification System
      10. 13. Passive Tests with the External Command File
      11. 14. The Nagios Service Check Acceptor (NSCA)
      12. 15. Distributed Monitoring
    5. III. The Web Interface and Other Ways to Visualize Nagios Data
      1. 16. The Classical Web Interface
      2. 17. Flexible Web Interface with the NDOUtils
      3. 18. NagVis
      4. 19. Graphic Display of Performance Data
    6. IV. Part IV Special Applications
      1. 20. Monitoring Windows Servers
      2. 21. Monitoring Room Temperature and Humidity
      3. 22. Monitoring SAP Systems
      4. 23. Processing Events with the EventDB
    7. V. Part V Development
      1. 24. Writing Your Own Plugins
      2. 25. Determining File and Directory Sizes
      3. 26. Monitoring Oracle with the Instant Client
    8. VI. Part VI Appendixes
      1. A. An Overview of the Nagios Configuration Parameters
      2. B. Rapidly Alternating States: Flapping
      3. C. Event Handlers
      4. D. Macros
      5. E. Single Sign-On for the Nagios Web Interface
      6. F. Tips on Optimizing Performance
      7. G. The Embedded Perl Interpreter
      8. H. What's New in Nagios 3.0?
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Appendix B. Rapidly Alternating States: Flapping

If the state of a host or service keeps on changing over and over, Nagios inundates the administrator with a flood of problem and recovery messages, which can not only be very irritating but also distract the administrator's attention from other, perhaps more urgent problems.

With a special mechanism, Nagios quickly recognizes alternating states and can inform the administrator of these selectively. The Nagios documentation refers to such alternating states as state flapping and to their detection as flap detection.

Whether these alternating states involve hosts or services has no influence on the detection mechanism itself. The differences are more to be found in the nature of host and service checks: ...

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