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

Solving problems with WebSockets

WebSockets are a modern protocol that allows a web application to have persistent, duplex, long-living connections to servers, similar to real TCP connections (and they are, under the hood, pretty normal TCP connections).

WebSockets use the special URL scheme ws:// (or wss:// for secure), and you will see that in your browser error console if you try to run a WebSocket-opening web application from an Nginx-powered server.

The philosophy behind WebSockets directly conflicts with the buffered-reverse proxy idea that is the foundation of Nginx as a web accelerator. See the previous chapter for the comprehensive introduction into what makes Nginx fast. Fortunately, modern Nginx is so much more than just a simple reverse proxy. It has so much to offer that even without the buffering and cheap connection pools, it is too valuable to ditch because of WebSockets. And since version 1.3.13, which was released almost 3 years ago, in early 2013, Nginx has had special...