Could you explain how Docker works and what its main components are?

Docker is a platform for building, shipping, and running applications in isolated containers. Containers allow you to package an application together with all its dependencies, ensuring consistent operation across different environments.

Main components of Docker:

• Docker Engine — a client-server application that includes:
  • Docker Daemon (dockerd) — a service that manages containers, images, networks, and storage.
  • Docker CLI — a command-line interface for interacting with the Docker Daemon.
• Images — templates used to create containers. An image contains everything needed to run an application.
• Containers — running instances of images, isolated processes with their own filesystem.
• Docker Hub — a public registry of images where you can find and download ready-made images.

Example of running a container:

# Run a container with nginx
docker run -d -p 80:80 nginx

Thus, Docker simplifies deployment and scaling of applications, ensuring environment consistency.