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
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Summary


If we look back at this chapter, we learned quite a bit about troubleshooting network connectivity issues on Linux. We learned how to use the netstat and tcpdump tools to look at the incoming and outgoing connections. We learned about the TCP three-way handshake and how the /etc/hosts file can supersede the DNS settings.

In this chapter, we covered many commands, and while we gave a pretty good overview of each command and what it does, there are some that we barely scratched the surface on.

Commands such as tcpdump are a prime example of this. In this chapter, we used tcpdump quite a bit, but this tool is capable of far more than we used it for. Of all of the commands that we covered in this book, I personally feel that tcpdump is one to spend time learning, as it is a very useful and powerful tool. I have used it to solve many issues, and sometimes, these issues were not network-specific but application-specific.

In this next chapter, we will keep this networking momentum going with...