How to properly organize the work of servers?

Question

PHP

Hi all!
I ran into this problem:
There are several servers (s1, s2, s3 ..... sN) that do their job and have no connection with the outside world, except for the manager server (front), which only displays data in a convenient form from each server. That's the question - how to connect the S servers to the front? the only way is only by api (now this is how it works)? Maybe AWS has the ability to connect these servers in a different way (php is used as the language)?

I will be glad for any help)))

Answer 1

1. API
2. Servers can communicate through a database
3. Servers can communicate through a queue broker
4. You might think about a shared storage - S3, a distributed file system, just a network drive mapped to each server.
The question is not "how to bind", the question is why do you need it, how do you imagine "binding" and what is its purpose?