Set port automatically Docker

Question

I’m using Docker to develop my web applications, but I realized I need to run several projects at the same time on my machine. Since these projects basically need the same containers, which are apache and mysql, whenever I start some project on my machine, I need to keep changing the host port. Is there any way I can automatically set a port to the container I want to create? For example, if port 80 is already being occupied by apache from another application, it automatically allocates another port for the application to be started.

I would also like to know if there is a way to configure the url of the application. for example, I currently access a project of mine through the link: localhost:3000. There is how I type in my browser meuprojeto.com.br and it direct to localhost:3000?

Answer 1

If your project’s Dockerfile exposes a port, simply use Docker -P instead of -p porta:porta so Docker can dynamically store any valid port when creating the container.

When we are in a Docker-Compose, in the element ports, just set only one port - "porta" instead of - "porta:porta" to have the same result.