Global Network Acceleration - Low-Latency Delivery with AWS Global Accelerator and CloudFront
Route traffic onto the AWS global network early using Anycast IPs to direct clients to the nearest edge location. This guide covers ALB/NLB integration and failover design.
Challenges of Global Network Acceleration and the AWS Approach
For organizations operating globally, delivering content and applications to users worldwide with low latency is a critical challenge. Internet routing is not optimized, and packets may take detours through multiple ISPs. This results in increased latency, packet loss, and jitter, degrading the user experience. Addressing this problem on-premises requires building data centers around the world and constructing Anycast routing or proprietary CDN infrastructure, incurring enormous investment and operational costs. AWS solves this challenge with two services: Global Accelerator and CloudFront. Global Accelerator leverages the AWS global network to forward traffic along optimal paths, while CloudFront caches and delivers content from over 450 edge locations worldwide. By combining both services, you can deliver both static content and dynamic applications at high speed.
How AWS Global Accelerator Works and How to Use It
AWS Global Accelerator is a networking service that improves application performance by up to 60% using the AWS global network. User traffic reaches the nearest AWS edge location and is then forwarded to the application endpoint over the AWS private network backbone. This reduces latency and packet loss compared to routing through the public internet. Global Accelerator provides two static Anycast IP addresses, allowing you to switch backend endpoints without DNS changes. The health check feature automatically detects failed endpoints and fails over traffic to healthy ones. Failover completes within tens of seconds, significantly faster than DNS-based failover. A key difference from CloudFront is that it supports TCP and UDP applications, game servers, VoIP, and IoT device communication in addition to HTTP.
Choosing Between and Combining CloudFront and Global Accelerator
Both CloudFront and Global Accelerator aim to improve global performance, but they are optimized for different use cases. CloudFront specializes in content caching and is ideal for static files (images, CSS, JavaScript), video streaming, and API response caching. By caching content at edge locations, it reduces requests to the origin server, lowering both delivery costs and latency. Global Accelerator, on the other hand, does not have caching capabilities and forwards all requests to the backend, but it provides network optimization at the TCP/UDP level. It is suited for workloads where caching is not appropriate, such as gaming, financial trading, and live streaming signaling that require real-time performance. A combined architecture is also effective: use CloudFront to deliver cacheable content while using Global Accelerator to accelerate dynamic application traffic. For more on CDN performance optimization, you can also check related books on Amazon.
Performance Optimization and Cost Management
To maximize Global Accelerator performance, proper configuration of endpoint group weights and traffic dials is essential. Traffic dials let you adjust the percentage of traffic directed to a specific region between 0% and 100%, which can also be used for blue-green deployments and canary releases. Client affinity settings can pin requests from the same client to the same endpoint, supporting stateful applications. On the cost side, Global Accelerator charges a fixed fee (approximately $18 USD per month per accelerator) plus data transfer fees. CloudFront uses pay-per-use pricing based on request count and data transfer volume. Enabling the Origin Shield feature consolidates requests to the origin, reducing origin load and cost. Selecting the appropriate CloudFront price class lets you limit delivery regions and optimize costs. Both services include AWS Shield Standard DDoS protection at no additional cost. AWS allows you to combine CloudFront, Global Accelerator, and WAF individually, selecting only the features you need to optimize costs. Below is an example of creating a Global Accelerator with the AWS CLI. aws globalaccelerator create-accelerator --name my-accelerator --ip-address-type IPV4 --enabled aws globalaccelerator create-listener --accelerator-arn arn:aws:globalaccelerator::123456789012:accelerator/abc-1234 --port-ranges FromPort=80,ToPort=80 FromPort=443,ToPort=443 --protocol TCP
Summary - Global Network Acceleration Strategy
By combining CloudFront's content caching across over 450 edge locations with Global Accelerator's traffic optimization over the AWS private network, you can comprehensively accelerate everything from static content to dynamic applications. Global Accelerator's static Anycast IPs and fast failover make it ideal for mission-critical applications that require high availability. When designing a global network strategy, evaluate the optimal combination of services along three axes: content characteristics (cacheable or not), protocol requirements (HTTP or TCP/UDP), and availability requirements.