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CloudFront Introduction

An introduction to Amazon CloudFront, AWS's global Content Delivery Network, and its role in accelerating content delivery and improving website performance.

10 minutes
Beginner

Overview

Amazon CloudFront is a fast content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds, and no minimum commitments. This guide will introduce you to the core concepts of CloudFront and why it is an essential service for modern web applications.

What is a CDN?

A Content Delivery Network (CDN) is a geographically distributed network of proxy servers and their data centers. The goal of a CDN is to distribute service content to end-users with high availability and high performance. When a user requests content from a website that uses a CDN, the CDN serves that content from a server closer to the user, known as an "edge location", rather than from the origin server.

How CloudFront Works

  1. A user requests a file (like an image or a JavaScript file) from your website or application.
  2. If you have CloudFront configured, the DNS routes the request to the nearest CloudFront edge location.
  3. The edge location checks its cache for the requested file.
  4. If the file is in the cache: The edge location immediately serves the file to the user. This is the fastest path.
  5. If the file is not in the cache: The edge location forwards the request to your "origin" server (e.g., an S3 bucket or an EC2 instance).
  6. The origin server sends the file back to the edge location.
  7. The edge location caches the file and then serves it to the user.

Key Features of CloudFront

Using CloudFront can significantly improve your application's performance and security.

Global Edge Locations

CloudFront has a global network of hundreds of points of presence (POPs) that include edge locations and regional edge caches in cities around the world. This ensures that your content is delivered with low latency to your global audience.

Caching

CloudFront caches copies of your content at its edge locations. This reduces the load on your origin server and decreases the time it takes for a user to receive the content. You can configure how long your content remains in the cache.

Security

CloudFront integrates with AWS WAF (Web Application Firewall) to protect your applications from web exploits. It also offers DDoS mitigation and HTTPS support at no additional cost.

Next Steps

With an understanding of what CloudFront is and how it works, you are ready to set it up.

  • Learn how to create a CloudFront distribution for your S3 bucket
  • Configure caching behaviors and security settings