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DevOps Troubleshooting: Linux Server Best Practices

DevOps Troubleshooting: Linux Server Best Practices

          
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About the Book

“If you’re a developer trying to figure out why your application is not responding at 3 am, you need this book! This is now my go-to book when diagnosing production issues. It has saved me hours in troubleshooting complicated operations problems.” –Trotter Cashion, cofounder, Mashion   DevOps can help developers, QAs, and admins work together to solve Linux server problems far more rapidly, significantly improving IT performance, availability, and efficiency. To gain these benefits, however, team members need common troubleshooting skills and practices.   In DevOps Troubleshooting: Linux Server Best Practices, award-winning Linux expert Kyle Rankin brings together all the standardized, repeatable techniques your team needs to stop finger-pointing, collaborate effectively, and quickly solve virtually any Linux server problem. Rankin walks you through using DevOps techniques to troubleshoot everything from boot failures and corrupt disks to lost email and downed websites. You’ll master indispensable skills for diagnosing high-load systems and network problems in production environments.   Rankin shows how to Master DevOps’ approach to troubleshooting and proven Linux server problem-solving principles Diagnose slow servers and applications by identifying CPU, RAM, and Disk I/O bottlenecks Understand healthy boots, so you can identify failure points and fix them Solve full or corrupt disk issues that prevent disk writes Track down the sources of network problems Troubleshoot DNS, email, and other network services Isolate and diagnose Apache and Nginx Web server failures and slowdowns Solve problems with MySQL and Postgres database servers and queries Identify hardware failures–even notoriously elusive intermittent failures

Table of Contents:
Preface         xiii Acknowledgments         xix About the Author         xxi   Chapter 1: Troubleshooting Best Practices         1 Divide the Problem Space 3 Practice Good Communication When Collaborating 4 Favor Quick, Simple Tests over Slow, Complex Tests 8 Favor Past Solutions 9 Document Your Problems and Solutions 10 Know What Changed 12 Understand How Systems Work 13 Use the Internet, but Carefully 14 Resist Rebooting 15   Chapter 2: Why Is the Server So Slow? Running Out of CPU, RAM, and Disk I/O         17 System Load 18 Diagnose Load Problems with top 20 Troubleshoot High Load after the Fact 29   Chapter 3: Why Won’t the System Boot? Solving Boot Problems         35 The Linux Boot Process 36 BIOS Boot Order 45 Fix GRUB 47 Disable Splash Screens 51 Can’t Mount the Root File System 51 Can’t Mount Secondary File Systems 55   Chapter 4: Why Can’t I Write to the Disk? Solving Full or Corrupt Disk Issues         57 When the Disk Is Full 58 Out of Inodes 61 The File System Is Read-Only 62 Repair Corrupted File Systems 63 Repair Software RAID 64   Chapter 5: Is the Server Down? Tracking Down the Source of Network Problems         67 Server A Can’t Talk to Server B 68 Troubleshoot Slow Networks 78 Packet Captures 83   Chapter 6: Why Won’t the Hostnames Resolve? Solving DNS Server Issues         93 DNS Client Troubleshooting 95 DNS Server Troubleshooting 98   Chapter 7: Why Didn’t My Email Go Through? Tracing Email Problems         119 Trace an Email Request 120 Understand Email Headers 123 Problems Sending Email 125 Problems Receiving Email 135   Chapter 8: Is the Website Down? Tracking Down Web Server Problems         141 Is the Server Running? 143 Test a Web Server from the Command Line 146 HTTP Status Codes 149 Parse Web Server Logs 154 Get Web Server Statistics 158 Solve Common Web Server Problems 163   Chapter 9: Why Is the Database Slow? Tracking Down Database Problems          171 Search Database Logs 172 Is the Database Running? 174 Get Database Metrics 177 Identify Slow Queries 182   Chapter 10: It’s the Hardware’s Fault! Diagnosing Common Hardware Problems         185 The Hard Drive Is Dying 186 Test RAM for Errors 190 Network Card Failures 191 The Server Is Too Hot 192 Power Supply Failures 194   Index         197  


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Product Details
  • ISBN-13: 9780133035544
  • Publisher: Pearson Education (US)
  • Publisher Imprint: Addison Wesley
  • Language: English
  • Sub Title: Linux Server Best Practices
  • ISBN-10: 0133035549
  • Publisher Date: 09 Nov 2012
  • Binding: Digital download
  • No of Pages: 240
  • Weight: 1 gr


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