At the moment i am using some webservers (let's say two) for hosting different websites for my clients. Some of the websites were hosted on webserver A, the others on webserver B.
It is unhandy because everytime i want to upload something i have to lookup the correct ftp server.
Is it a good solution to make the sources (php files, images etc.) accessible for all webservers with the new Amazon EFS service?
Or is there another solution? Mirrors and complex CI are no options.
If cost is not your concern then EFS is the best option. You can achieve this using S3 too by mounting a S3 bucket onto your EC2 instance.
https://www.emfluence.com/blog/amazon-web-services-integrating-s3-and-ec2-few-simple-steps#gref