Docker: How internally docker client communicate to docker host ?

Question

I know docker client is used to launch docker containers on docker host. Which protocol is used between docker client and docker host ? Is it necessary docker client run on the same host in which docker client run ?

Answer 1

At a very high level, Docker consists of following three major components:
- Docker Client
- Docker Host
- Docker Registry

Each component gets involved while launching Docker container.
Though, Docker client communicates to Docker host through command line interface or using docker compose, internally those CLI commands gets converted into REST API and Docker host serves these REST Requests.

Reference:
https://docs.docker.com/engine/api/#api-example