Create an Amazon CloudFront distribution to cache state files at edge locations
Create an Amazon ElastiCache cluster. Connect the ALB to the ElastiCache cluster to serve cached files
Create an AWS WAF web ACL and associate it with the ALB. Add a rule to the web ACL to cache static files
Create a second ALB in an alternative AWS Region. Route user traffic to the closest Region to minimize data transfer costs
Explanations:
Creating an Amazon CloudFront distribution allows for caching static content at edge locations, which reduces latency and load on the EC2 instances. This setup effectively lowers costs by minimizing data transfer from the origin and improving load times for users.
While Amazon ElastiCache can enhance performance by caching database queries or session data, it does not directly cache static files for a website. Therefore, connecting an ALB to ElastiCache for caching static files would not be effective.
AWS WAF (Web Application Firewall) is primarily for filtering and monitoring HTTP requests, not for caching static files. Associating a WAF web ACL with the ALB does not provide caching capabilities, and it is not the correct approach to reduce costs related to static content.
Creating a second ALB in an alternative AWS Region adds complexity and potential additional costs due to cross-region data transfer. It does not effectively address the problem of caching static content, which is the primary concern in reducing costs associated with increasing website traffic.
I rank that the answer is:
Create an Amazon CloudFront distribution to cache state files at edge locations