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Red Hat Enterprise Linux Troubleshooting Guide

You're reading from   Red Hat Enterprise Linux Troubleshooting Guide Identify, capture and resolve common issues faced by Red Hat Enterprise Linux administrators using best practices and advanced troubleshooting techniques

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Product type Paperback
Published in Oct 2015
Publisher
ISBN-13 9781785283550
Length 458 pages
Edition 1st Edition
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Author (1):
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Benjamin Cane Benjamin Cane
Author Profile Icon Benjamin Cane
Benjamin Cane
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Table of Contents (14) Chapters Close

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

Comparing historical metrics

Looking at all of the facts that we learned about this system so far, it seems that our next best course of action would be to recommend contacting the vagrant user to identify whether the lookbusy and bonnie++ applications should be running with such high resource utilization.

While the previous observations show a high resource utilization, this level of utilization may be expected for this environment. Before we start contacting users, we should first review the historical performance metrics of this server. In most environments, there is some sort of server performance monitoring software such as Munin, Cacti, or one of the many cloud SaaS providers in place that collects and stores system statistics.

If your environment utilizes one of these services, you can use the collected performance data to compare previous performance statistics with the information that we just gathered. If for instance over the past 30 days, the CPU performance was never higher than...

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