Docker

 Docker is a platform and contains set of tools that facilitate creation, deployment and execution of the application in a portable and light weight containers. Containers provide isolated environment for your code. Containers enable developers to package applications and their dependencies into a single unit, ensuring consistency across different environments and simplifying the deployment process. Key Concepts are

  • Containerisation: Docker uses containerisation technology to encapsulate applications and their dependencies into containers. Containers are isolated, lightweight, and share the host operating system's kernel, making them efficient and portable.
  • Docker Image: A Docker image is a lightweight, stand-alone, executable package that includes everything needed to run a piece of software, including the code, runtime, libraries, and system tools. Images serve as the foundation for creating containers.
  • Docker Hub: Docker Hub is a cloud-based registry where developers can find and share Docker images. It provides a central repository for official images and user-contributed images, making it easy to distribute and discover containerised applications.
  • Docker file: Docker files are configuration files used to define the steps and instructions for building a Docker image. They specify the base image, required dependencies, application code, and other settings.
  • Container Orchestration: Docker can be used with container orchestration tools like Kubernetes, Docker Swarm, and others. These tools help manage the deployment, scaling, and operation of containerised applications in a clustered environment.
  • Docker Compose: Docker Compose is a tool for defining and running multi-container Docker applications. It allows developers to define a multi-container environment in a single file and manage the entire application stack.
  • Cross-Platform Compatibility: Docker containers are platform-agnostic and can run on any system that supports Docker. This eliminates the "it works on my machine" problem and ensures consistency across development, testing, and production environments.


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