An edition of Red Hat Enterprise Linux troubleshooting guide
(2015)
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
by Benjamin Cane
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Book Details
Published in
Birmingham, UK
Table of Contents
Cover; Copyright; Credits; About the Author; About the Reviewers; www.PacktPub.com; Table of Contents; Preface; Chapter 1: Troubleshooting Best Practices; Styles of troubleshooting; The Data Collector; The Educated Guesser; The Adaptor; Choosing the appropriate style; Troubleshooting steps; Understanding the problem statement; Asking questions; Attempting to duplicate the issue; Running investigatory commands; Establishing a hypothesis; Putting together patterns; Is this something that I've encountered before?; Trial and error; Start by creating a backup; Getting help; Books
Team Wikis or RunbooksGoogle; Man pages; Red Hat kernel docs; People; Documentation; Root cause analysis; The anatomy of a good RCA; The problem as it was reported; The actual root cause of the problem; A timeline of events and actions taken; Any key data points to validate the root cause; A plan of action to prevent the incident from reoccurring; Establishing a root cause; Sometimes you must sacrifice a root cause analysis; Understanding your environment; Summary; Chapter 2: Troubleshooting Commands and Sources of Useful Information; Finding useful information; Log files
The default locationCommon log files; Finding logs that are not in the default location; Configuration files; Default system configuration directory; Finding configuration files; The proc filesystem; Troubleshooting commands; Command-line basics; Command flags; The piping command output; Gathering general information; w
show who is logged on and what they are doing; rpm
RPM package manager; df
report file system space usage; free
display memory utilization; ps
report a snapshot of current running processes; Networking; ip
show and manipulate network settings
Netstat
network statisticsPerformance; iotop
a simple top-like I/O monitor; iostat
report I/O and CPU statistics; vmstat
report virtual memory statistics; sar
collect, report, or save system activity information; Summary; Chapter 3: Troubleshooting a Web Application; A small back story; The reported issue; Data gathering; Asking questions; Duplicating the issue; Understanding the environment; Where is this blog hosted?; Ok, it's within our environment; now what?; What services are installed and running?; Looking for error messages; Apache logs; Verifying the database
Verifying the WordPress databaseEstablishing a hypothesis; Resolving the issue; Understanding database data files; Finding the MariaDB data folder; Resolving data file issues; Validating; Final validation; Summary; Chapter 4: Troubleshooting Performance Issues; Performance issues; It's slow; Performance; Application; CPU; Top
a single command to look at everything; Determining the number of CPUs available; ps
Drill down deeper on individual processes with ps; Putting it all together; A quick look with top; Memory; free
Looking at free and used memory; Checking for oomkill
Ps
Checking individual processes memory utilization
Edition Notes
Includes index.
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The Physical Object
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| August 17, 2022 | Edited by ImportBot | import existing book |
| May 18, 2022 | Created by ImportBot | import new book |