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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

Troubleshooting from historic issues


The first instinct for a Data Collector would be to simply run through the same troubleshooting steps from Chapter 5, Network Troubleshooting. The Adaptor and Educated Gusser troubleshooters, however, knowing the issue a few days ago was due to a static route would simply log in to the database server first and check for the same static route.

Maybe someone simply re-added it by mistake, or the route was not fully removed from the system's configuration files:

[db]# ip route show
default via 10.0.2.2 dev enp0s3  proto static  metric 1024
10.0.2.0/24 dev enp0s3  proto kernel  scope link  src 10.0.2.15
169.254.0.0/16 dev enp0s8  scope link  metric 1003
192.168.33.0/24 dev enp0s8  proto kernel  scope link  src 192.168.33.12

Unfortunately, however, our luck is not that good; from the results of the ip command, we can see that the static route from Chapter 5, Network Troubleshooting, is not present.

Since the route is not present, we will need to start again...

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