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Red Hat Enterprise Linux Troubleshooting Guide

You're reading from   Red Hat Enterprise Linux Troubleshooting Guide Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniques

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Product type Paperback
Published in Oct 2015
Publisher
ISBN-13 9781785283550
Length 458 pages
Edition 1st Edition
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Author (1):
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Benjamin Cane Benjamin Cane
Author Profile Icon Benjamin Cane
Benjamin Cane
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Table of Contents (14) Chapters Close

Preface 1. Troubleshooting Best Practices 2. Troubleshooting Commands and Sources of Useful Information FREE CHAPTER 3. Troubleshooting a Web Application 4. Troubleshooting Performance Issues 5. Network Troubleshooting 6. Diagnosing and Correcting Firewall Issues 7. Filesystem Errors and Recovery 8. Hardware Troubleshooting 9. Using System Tools to Troubleshoot Applications 10. Understanding Linux User and Kernel Limits 11. Recovering from Common Failures 12. Root Cause Analysis of an Unexpected Reboot Index

Establishing a hypothesis

At this stage of the troubleshooting process, we will take all of the information that we have gathered and use it to establish an idea as to why the issue occurred and what can be done to resolve it.

To start, let's first review what we have learnt from the Data Gathering steps.

  • An established blog site is currently showing a page that is designed to only be shown during initial installation of the blog software
  • The blog is using the open source software WordPress
  • WordPress is written in PHP and utilizes both Apache and MariaDB services
  • Apache and PHP are working correctly and showing no errors
  • The WordPress installation is located at /var/www/html
  • The MariaDB service is up and accepting connections
  • The WordPress application is able to connect to the database service
  • When reading from the database tables, we receive an error that indicates an issue with the files that contain the database data

The hypothesis that we can formulate from all of these data points is as...

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