Book Image

Red Hat Enterprise Linux Troubleshooting Guide

By : Benjamin Cane
Book Image

Red Hat Enterprise Linux Troubleshooting Guide

By: Benjamin Cane

Overview of this book

Red Hat Enterprise Linux is an operating system that allows you to modernize your infrastructure, boost efficiency through virtualization, and finally prepare your data center for an open, hybrid cloud IT architecture. It provides the stability to take on today's challenges and the flexibility to adapt to tomorrow's demands. In this book, you begin with simple troubleshooting best practices and get an overview of the Linux commands used for troubleshooting. The book will cover the troubleshooting methods for web applications and services such as Apache and MySQL. Then, you will learn to identify system performance bottlenecks and troubleshoot network issues; all while learning about vital troubleshooting steps such as understanding the problem statement, establishing a hypothesis, and understanding trial, error, and documentation. Next, the book will show you how to capture and analyze network traffic, use advanced system troubleshooting tools such as strace, tcpdump & dmesg, and discover common issues with system defaults. Finally, the book will take you through a detailed root cause analysis of an unexpected reboot where you will learn to recover a downed system.
Table of Contents (19 chapters)
Red Hat Enterprise Linux Troubleshooting Guide
About the Author
About the Reviewers

Data gathering

If we look back at Chapter 1, Troubleshooting Best Practices, the first step in the troubleshooting process is to understand the problem statement. In this section, we are going to explore how the problem was reported and will try to collect any data that we can to find the root cause of the issue.

For this example, we were notified of the issue via a phone call. This is actually lucky as we have an end user on the phone and can ask questions to get more information from him/her.

Before asking the person reporting the issue for more information, let's first take a look at what was already answered. All of a sudden, our blog is showing an installation page and not our posts!

At first, you may feel that this problem statement is vague; this is because it is vague. However, there is still quite a bit of useful information in this single sentence. If we dissect the reported issue, we can gain a better understanding of the problem.

  • "Our blog is showing an installation page"

  • "All of...