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


In this chapter, we covered how to respond to a very difficult issue: an unexpected reboot. We used the tools and methodologies we saw throughout this book to identify the root cause and create a root cause report.

We used log files heavily throughout this book; in this chapter, we were able to use these logs to identify the process that rebooted the server. We also identified the reason watchdog decided to reboot the server, which was due to a high load average.

We were able to use tools such as sar, df, du, and ls to determine the timing and cause of the high load average. All of these tools are commands you learned about throughout this book.

With this last chapter, we covered quite a few examples that were covered earlier in this book. You learned how to troubleshoot web applications, performance issues, custom applications, and hardware problems. We did all of these using real-world examples with real-world solutions.

While this book covers quite a few topics, the goal of this book...