serverless architecture hosting websites with Lambda and ECR

Question

example.com
I have an S3 bucket with CloudFront origin using OAI to serve static content.
I uploaded a PHP application to ECR. I am still trying to get this all working.  The Docker instance runs on my machine but I haven’t got it running in AWS yet.
I want to use API gateway to point to a Lambda function that uses the ECS to serve dynamic content. 
My plan is that once ECS is working to add it to a Lambda and add that to API gateway and then add that to a CloudFront origin which will serve the dynamic content.
 
example2.com
I have another S3 bucket with a CloudFront origin using OAI to serve static content. Another origin points to API gateway which points to a Lambda function written in Python for serving the dynamic content.
 
Is there a better way to do what I just said?  For example, we have an Application Load Balancer.  Could I separate everything out and use the ALB to connect everything together and make it look like the API gateway and Cloudfront distributions are all a part of one website?

Answer

What I understand from your question is that you have a website with both static and dynamic content.
I would not use the approach with an API gateway + Lambda function calling an ECS task directly. We did something similar in a project and it quickly became a mess, hard to auto-scale and more.
What I would do is create an Application LoadBalancer with the ECS service as target for the ALB. This way you can easy auto-scale the service. Next I would create a CloudFront distribution that serve both the static content and dynamic content, by adding S3 and the ALB as origins. Here you can use a path pattern like `/static/` to route requests for static content to the S3 origin.

serverless architecture hosting websites with Lambda and ECR

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