docker

For inter-container communication in Docker, you first need to manually create an existing Docker network. Afterwards, set external: true in docker-compose.yml.For inter-container communication, the port mapping of the host is irrelevant and the internal port is used directly.

When Dockerising and accessing services inside the container, the Docker container itself is an environment that is also independent of the host machine, so access is only possible via the container port.There are two ways to configure Docker port mapping: using the docker run command or using docker-compose.yml.

Docker enables virtualization (running a virtual PC inside a PC) using containers, which are lighter and more efficient than traditional virtual machines. a Docker container is a runtime environment generated from a Docker image. Containers are launched based on images and provide an isolated environment for running applications.