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This soft file is ready to read anytime you want. Home [B4W. Davis [B4W. Richardson [B4W. Bob Allison [B4W. Paulson [B4W. Kiyosaki [B4W. Cooper [B4W. Dobson [B7A. Richmond [B7A. Guelzo [B7A. Richard Dietrich Maddox [B7A. Elliot Howard [B7A. Morgan [B7A. Montgomery [B7A. Warwick [B7A. Kingdom [B7A. Joyce [D4N. By Evie Adams [D4N. You will learn to troubleshoot, diagnose, and resolve or provide evidence of issues that cause degradation and loss of performance.
In addition to preparation for the exam, this course is suited to those that wish to develop their skills in RHEL troubleshooting. This is a Red Hat Certified Architect level course. This course focuses on providing that knowledge. This approach is then used troubleshooting various types of. This course enriches your skills by providing the tools and techniques that you need to successfully diagnose, and fix, a variety of potential issues.
Chapter 6 troubleshooting skills and your knowledge of Red Hat Enterprise Linux, then this book is perfect for you. Validate the web server Validating the database service Validating PHP A summary of installed and running services Looking for error messages Apache logs Finding the location of Apache's logs Reviewing the logs Using curl to call our web application Requesting a non-PHP page Reviewing generated log entries What we learned from httpd logs Verifying the database Verifying the WordPress database Finding the installation path for WordPress Checking the default configuration Finding the database credentials Connecting as the WordPress user Validating the database structure What we learned from the database validation Establishing a hypothesis Resolving the issue Understanding database data files Finding the MariaDB data folder Resolving data file issues Validating Final validation Summary 4.
Network Troubleshooting Database connectivity issues Data collection Duplicating the issue Finding the database server Testing connectivity Telnet from blog. Viewing device configuration Specifying the interface with tcpdump Reading the captured data A quick primer on TCP Types of TCP packet Reviewing collected data Taking a look on the other side Identifying the network configuration Testing connectivity from db. Using System Tools to Troubleshoot Applications Open source versus home-grown applications When the application won't start Exit codes Is the script failing, or the application?
A wealth of information in the configuration file Watching log files during startup Checking whether the application is already running Checking open files Understanding file descriptors Getting back to the lsof output Using lsof to check whether we have a previously running process Finding out more about the application Tracing an application with strace What is a system call? Using strace to identify why the application will not start Resolving the conflict Summary Background questions Is the cron job even running?
User crontabs Understanding user limits The file size limit The max user processes limit The open files limit Changing user limits The limits. Why is it down? What else was happening at that time?
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