Hi, in the course “The Beginners Guide to Docker” you write in the 30000 feet view, that in the past only one application per server was running. Can’t see that as I know multiple servers running multiple services without virtualization or containerization. That’s what ports are ultimately for, right? Or did I get something wrong?
Please elaborate a little on that, thanks 
Hi @Manuel_Tiedtke!
You are right about multiple applications running on the same server on different ports. That’s usually not the case in production environments. If an application takes up too many resources, all the other applications will choke if deployed on the same server without virtualization or containerization.
The purpose of the chapter is to reiterate how virtualization and containerization help in this regard.