Book Image

Nginx Troubleshooting

By : Alexey Kapranov
Book Image

Nginx Troubleshooting

By: Alexey Kapranov

Overview of this book

Nginx is clearly winning the race to be the dominant software to power modern websites. It is fast and open source, maintained with passion by a brilliant team. This book will help you maintain your Nginx instances in a healthy and predictable state. It will lead you through all the types of problems you might encounter as a web administrator, with a special focus on performance and migration from older software. You will learn how to write good configuration files and will get good insights into Nginx logs. It will provide you solutions to problems such as missing or broken functionality and also show you how to tackle performance issues with the Nginx server. A special chapter is devoted to the art of prevention, that is, monitoring and alerting services you may use to detect problems before they manifest themselves on a big scale. The books ends with a reference to error and warning messages Nginx could emit to help you during incident investigations.
Table of Contents (15 chapters)
Nginx Troubleshooting
About the Author
About the Reviewers
Rare Nginx Error Messages

Processing a complain

Let us call any expressed case of unexpected behavior a complain. The term is vague enough not to imply that it is always a problem or an error, which was introduced during development and needs to be fixed. Working on a complain starts with investigation. The only thing that you know from the beginning is that something on your website does not work for someone. The incidents raised as a result of automatic monitoring systems are a separate case.

Surprisingly, people in general are rarely capable of answering the question of "What exactly does not work for you?" Some of them get confused or even angry. While you must always ask this, do not get high hopes. Let us analyze some of the possible answers from the most popular to less so:

  • "Nothing!"

  • "I load the page, I click there and there, order a book, get to my shopping cart, initiate payment, get confirmation and on the last step there a security warning about some sort of certificate which expired yesterday"

Most of...