AWS CloudFront CDN

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AWS CloudFront is a CDN that caches and serves your content (HTML, CSS, JS, images, API responses) from edge locations near your users. Setup involves creating a distribution, pointing to an origin (S3, load balancer, Lambda), and configuring cache behaviors. Mastery means understanding cache invalidation, compression, security headers, geographic restrictions, and cost optimization. Learning path: CDN concepts (1 week) → CloudFront setup (1 week) → cache control (2 weeks) → security + optimization (2 weeks).

AWS CloudFront CDN이란

AWS CloudFront is a Content Delivery Network (CDN) with 600+ edge locations globally. When a user requests content (HTML, CSS, JS, images, API responses), CloudFront serves it from the nearest edge location instead of the origin server. If the content is cached, the user gets it instantly. If not, CloudFront fetches from origin, caches it, and returns it. Result: global users see sub-100ms latency, origins see 70-90% fewer requests, and transfer costs drop.

🔧 도구 & 생태계

AWS CloudFront ConsoleAWS CloudFront CLICloudFront FunctionsLambda at EdgeS3 OriginApplication Load BalancerOrigin Access IdentityAWS WAF

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Web Performance Cloud Platforms

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지역	주니어	미들	시니어
USA	$65k	$105k	$150k
UK	£40k	£65k	£95k
EU	€45k	€70k	€105k
CANADA	C$70k	C$115k	C$160k

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AWS Certified Solutions Architect, Associate AWS Certified Developer, Associate AWS Certified Data Analytics, Specialty

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Cdn Architecture Cdn Architecture Web Performance

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When should I use CloudFront vs. just S3?

S3 alone serves from a single region (slow for global users). CloudFront caches in 600+ edge locations (fast everywhere). Always use CloudFront for static content.

What's the difference between CloudFront and a load balancer?

Load balancer distributes traffic across servers in one region. CloudFront caches content globally and reduces origin load. Use both: CloudFront in front + load balancer behind.

How do I cache API responses in CloudFront?

Create a behavior for /api/* with cache enabled. Use Cache-Control headers from your API. Include query strings and headers in cache key to avoid stale data.

Can I compress files in CloudFront?

Yes, CloudFront automatically compresses text (HTML, CSS, JSON) using gzip. Enable compression in distribution settings.

How do I invalidate stale content?

Use CloudFront invalidations (/*) to purge cache. Invalidations take 30-90 seconds. Use versioned file names (app-v1.0.js) instead of invalidating.

Is CloudFront secure?

Yes, HTTPS by default, signed URLs for private content, AWS WAF integration for DDoS/bot protection. Use Origin Access Identity to restrict S3 access.

How much does CloudFront cost?

Pay per GB downloaded from edge locations (~$0.085/GB US). Caching reduces origin load and costs. Invalidations are free.

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