Introduction to Docker

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What is Docker ??

Docker is a Linux-based, open-source containerization platform. This containerization platform used to build, run, and also use in package applications for using containers by developers. Compare to other virtual machines, the Docker container provides:

  • Interoperability
  • Efficient in build and test
  • OS-level abstraction with optimal resource usage
  • Provide faster application execution
Mainly, Docker containers divide and modularize an application's functionality into multiple components to do the deployment, testing, or scaling them independently when needed.
For example, if we take Docker as a containerized database of an application, with a framework that can scale and maintain the database independently from other components in the application without the impact of the other critical systems with their workloads.

Components of a Docker Architecture

Docker contains the different 4 components mentioned below, within its core architecture :

  • Images
  • Containers
  • Registers
  • Docker Engine

Images

Images are similar to blueprints which contain the instructions needed for creating a Docker container. Images  define:

  • In Application dependencies
  • The processers that needed to run when the application starts

Containers

Containers act as the live instance of images on an application or its independent modules are run.

Registers

A Docker image similar to the repository of images. Docker Hub is the default registry and it is a public register that containers public and official images for different languages and platforms. A request for an image from Docker is searched within the Docker Hub registry, by default.

Docker Engine

Docker Engine also the core component of the Docker architecture on whatever the application runs. Docker Engine considers as an application that's installed on the relevant system that manages the containers, images, and also builds.

The client-server architecture uses in Docker Engin and consists of the following three components.

  • The Docker Daemon
  • The Docker Client
  • A REST API

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