Can you tell about cases when you had to implement interaction between Docker containers to solve tasks?

Interaction between containers in Docker is often implemented using Docker networks, which allow containers to communicate with each other by service names. For example, in developing a microservices application, one container might run a database, and another — an application that connects to it.

Example of creating a custom network and running containers in it:

docker network create my_network

docker run -d --name db --network my_network postgres

docker run -d --name app --network my_network my_app_image

In the application, you can refer to the database by the hostname db, which simplifies configuration and scaling.