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

Optimizing individual upstreams

You may remember from previous chapters that Nginx has two main methods of generating a response to a request, one being very specific—reading a static file from the filesystem, and the other including a whole family of the so-called upstream modules. An upstream is an external server to which Nginx proxies the request. The most popular upstream is ngx_proxy, others are ngx_fastcgi, ngx_memcached, ngx_scgi, and so on. Because serving only static files is not usually enough for a modern website, upstreams are an essential part of any comprehensive setup. As we mentioned in the beginning of this chapter, upstreams themselves are usually the reason why your website has performance troubles. Your developers are responsible for this part because this is where all the web application processing happens. In the following sections, we are going to briefly describe the major stacks or platforms used to implement business logic on the upstream behind Nginx and the directions...