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

Chapter 2. Troubleshooting Commands and Sources of Useful Information

In the first chapter, we covered troubleshooting best practices and the high level process involved. Where the first chapter was a 20,000 ft view on troubleshooting, this chapter starts to dive into the specifics.

This chapter will review common troubleshooting commands as well as common places to find helpful information. Within this book, we will utilize release 7 of Red Hat Enterprise Linux (also referred to as RHEL). All commands referenced in this chapter will be commands that are included with a default installation of RHEL 7.

We will reference commands that are installed by default, as I have found myself in situations where I could have used a specific command to identify an issue immediately but that command was not available to me. By limiting this chapter to default commands, you can be assured that the troubleshooting steps covered in this chapter are not only relevant to most RHEL 7 installations, but are also...