Introduction

Overview

The Content Delivery Network (CDN) is a distributed network that is built on the bearer network and consists of edge node server clusters in different areas. The CDN reduces the pressure on the origin server, avoids network congestion, accelerates the distribution of website content in different regions and scenarios, and improves the resource access speed. The most important function of the CDN is the cache service.

Apache Traffic Server (ATS or TS) is a high-performance, scalable and extensible HTTP/1.1 and HTTP/2.0 compliant caching proxy server. Traffic Server was originally a commercial product of Inktomi (the company was acquired by Yahoo in 2003). After that, Traffic Server has been used in Yahoo for four years until August 2009 when Yahoo contributed source code to the Apache Software Foundation (ASF). In April 2010, it became a top-level project of ASF. Apache Traffic Server is now an open-source project developed in C++. It is mainly used by CDN and content providers.

This document uses ATS as the cache software to describe how to deploy CDN nodes.