Do I need an orchestrator to run one container for a single server?

Question

Docker

Our project runs on nginx + php-fpm + mysql + redis stack.
Each application is in a separate container, but everything is running on one physical server, and is lifted through docker-compose.

There was a need to replicate the database to a separate server (master + 2 slaves), the master remains on the current server, and two slaves need to be deployed on two separate servers.

Question: Is an orchestrator required here? Is it possible without it?
If not, how to do it via docker-swarm?

Answer 1

MySQL is better to be pulled out of containers and deployed separately, since it will be difficult to manage it in containers.

Answer 2

an orchestrator is needed here

Not necessary. It is possible without it - no one forbids it.