Docker Tutorials

Docker Introduction

Docker is a platform and a set of tools designed to make it easier to create, deploy, and run applications using containers. Containers allow developers to package an application along with its dependencies, libraries, and runtime, into a single unit.

Key concepts related to docker

1. Containerization: Docker uses containerization to encapsulate applications and their dependencies, ensuring consistent behavior across different environments.
2. Dockerfile: A Dockerfile is a script that contains instructions for building a Docker image. An image is a lightweight, standalone, executable package that includes everything needed to run a piece of software.
3. Docker Image: An image is a snapshot of a file system and the parameters needed for running a particular program. Images are used to create containers.
4. Docker Container: A container is a runnable instance of a Docker image. It encapsulates an application and its dependencies, ensuring isolation from the host system.
5. Docker Engine: Docker Engine is the core technology that enables containerization. It includes a daemon process (dockerd) that manages Docker containers on a host system.

Docker Hub:

Docker Hub is a cloud-based registry service provided by Docker[much like maven central repository]. It serves as a centralised repository for Docker images. Developers use Docker Hub to store, share, and distribute Docker images. Some key points about Docker Hub include:

1. Image Hosting: Docker Hub hosts Docker images, making it a centralized hub for sharing and distributing containerized applications.
2. Public and Private Repositories: Docker Hub supports both public and private repositories. Public repositories are accessible to anyone, while private repositories require authentication to access.
3. Collaboration: Docker Hub facilitates collaboration by allowing developers to share their images with others. It is commonly used in conjunction with version control systems and CI/CD pipelines.
4. Official Images: Docker Hub hosts “official” images for various software applications and operating systems, providing a trusted source for commonly used containers.