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

Performance


In general, performance issues can be categorized into five areas:

  • Application

  • CPU

  • Memory

  • Disk

  • Network

A bottleneck in any one area can often affect other areas as well; therefore, it is a good idea to understand each of these topics. By understanding how each of these resources is accessed and interacts, you will be able to find the root cause of issues that consume multiple resources.

Since the issue being reported did not include any details of the performance issue, we will explore and learn about each of these areas. Once complete, we will look at the data collected and look at historical statistics to determine whether the performance is as expected or whether the system performance really is degraded.

Application

While creating a list of performance categories, I ordered them by areas that I see most often. Every environment is different, but in my experience, the application can often be a primary source of performance issues.

While this chapter is designed to cover performance...