Red Hat Enterprise Linux Troubleshooting Guide

Book Description

Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniques

About This Book

• Develop a strong understanding of the base tools available within Red Hat Enterprise Linux (RHEL) and how to utilize these tools to troubleshoot and resolve real-world issues
• Gain hidden tips and techniques to help you quickly detect the reason for poor network/storage performance
• Troubleshoot your RHEL to isolate problems using this example-oriented guide full of real-world solutions

Who This Book Is For

If you have a basic knowledge of Linux from administration or consultant experience and wish to add to your Red Hat Enterprise Linux troubleshooting skills, then this book is ideal for you. The ability to navigate and use basic Linux commands is expected.

What You Will Learn

• Identify issues that need rapid resolution against long term root cause analysis
• Discover commands for testing network connectivity such as telnet, netstat, ping, ip and curl
• Spot performance issues with commands such as top, ps, free, iostat, and vmstat
• Use tcpdump for traffic analysis
• Repair a degraded file system and rebuild a software raid
• Identify and troubleshoot hardware issues using dmesg
• Troubleshoot custom applications with strace and knowledge of Linux resource limitations

In Detail

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.

Style and approach

This is an easy-to-follow guide packed with examples of real-world core Linux concepts. All the topics are presented in detail while you’re performing the actual troubleshooting steps.

Table of Contents

Chapter 1. Troubleshooting Best Practices
Chapter 2. Troubleshooting Commands and Sources of Useful Information
Chapter 3. Troubleshooting a Web Application
Chapter 4. Troubleshooting Performance Issues
Chapter 5. Network Troubleshooting
Chapter 6. Diagnosing and Correcting Firewall Issues
Chapter 7. Filesystem Errors and Recovery
Chapter 8. Hardware Troubleshooting
Chapter 9. Using System Tools to Troubleshoot Applications
Chapter 10. Understanding Linux User and Kernel Limits
Chapter 11. Recovering from Common Failures
Chapter 12. Root Cause Analysis of an Unexpected Reboot

中文：

书名：Red Hat Enterprise Linux故障排除指南

使用最佳实践和高级故障排除技术确定、捕获和解决Red Hat Enterprise Linux管理员面临的常见问题

关于本书

• 深入了解Red Hat Enterprise Linux(RHEL)中可用的基本工具，以及如何利用这些工具对实际问题进行故障排除和解决
• 获得隐藏的提示和技术，帮助您快速发现网络/存储性能不佳的原因
• 使用这个充满实际解决方案的面向示例的指南来排除RHEL故障以隔离问题

这本书是为谁写的

如果您通过管理或顾问经验对Linux有基本的了解，并希望增加您的Red Hat Enterprise Linux故障排除技能，那么这本书是您的理想之选。需要具备导航和使用基本Linux命令的能力。

你将学到什么

• 根据长期根本原因分析确定需要快速解决的问题
• 发现用于测试网络连通性的命令，例如telnet、netstat、ping、ip和curl
• 使用top、ps、free、iostat和vmstat等命令发现性能问题
• 使用tcpump进行流量分析
• 修复降级的文件系统并重建软件RAID
• 使用dMesg确定硬件问题并进行故障排除
• 使用strace和Linux资源限制知识对定制应用程序进行故障排除

详细地说

Red Hat Enterprise Linux是一个操作系统，可让您实现基础架构的现代化，通过虚拟化提高效率，并最终为开放式混合云IT架构做好数据中心的准备。它提供了应对今天挑战的稳定性和适应明天需求的灵活性。

在本书中，您将从简单的故障排除最佳实践开始，并概述用于故障排除的Linux命令。这本书将涵盖Web应用程序和服务的故障排除方法，如阿帕奇和MySQL。然后，您将学习识别系统性能瓶颈和排除网络问题；同时学习重要的故障排除步骤，例如了解问题陈述、建立假设以及了解试验、错误和文档。接下来，本书将向您展示如何捕获和分析网络流量、使用高级系统故障排除工具(如strace、tcpump&amp；dMesg)以及发现系统默认设置的常见问题。

最后，本书将带您详细分析意外重启的根本原因，在此过程中，您将学习恢复出现故障的系统。

风格和方法

这是一本简单易懂的指南，其中包含了真实世界中的核心Linux概念的示例。当您执行实际的故障排除步骤时，所有主题都会详细介绍。

目录表

第1章：最佳实践故障排除
第2章.故障排除命令和有用信息来源
Chapter 3. Troubleshooting a Web Application
第4章：解决性能问题
第5章.网络故障排除
第6章.诊断和纠正防火墙问题
第7章.文件系统错误和恢复
第8章.硬件故障排除
第9章使用系统工具对应用程序进行故障排除
第10章了解Linux用户和内核限制
第11章.从常见故障中恢复
第12章.意外重启的根本原因分析