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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 /
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 t...
| Clasificación: | Libro Electrónico |
|---|---|
| Autor principal: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Birmingham, UK :
Packt Publishing,
2015.
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| Colección: | Professional expertise distilled.
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| Temas: | |
| Acceso en línea: | Texto completo Texto completo |
Tabla de Contenidos:
- 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