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

Creating infrastructure around logs

Okay, let's do some arithmetic. Suppose that you have a rather popular but not on a world scale (yet) website with about 50,000 visits per day. This is a number that managers brag about during their meetups; they get it from some analytics software. It almost means nothing regarding your job. Because what is a visit? Let's say that what you have is an e-commerce site; you sell some nonseasonal stuff, for example, power tools. Your average visitor will look at one to two pages with spikes to early tens when actually choosing and buying something. Let it be three pages per visit on average. What is a page? For you, it is a series of HTTP responses—the main document and all the embedded objects. People notoriously underestimate the sheer size of modern web pages. It would be a safe bet to say that your pages include on average 100 objects (HTML documents, images, scripts, style sheets, and so on) amounting to the size of over a megabyte.

This will be 100 x...