Docker

What is Docker?

Docker is a containerization platform that provides an easy way to containerize your applications. It allows you to:

• Build container images
• Run images to create containers
• Push containers to container registries like DockerHub and Quay.io

Docker Desktop

Docker Desktop is an easy-to-install application for Mac, Windows, or Linux that enables you to:

• Build and share containerized applications
• Includes key components such as:
  • Docker daemon (dockerd)
  • Docker client
  • Docker Compose
  • Docker Content Trust
  • Kubernetes
  • Credential Helper

Docker Registries

A Docker registry stores Docker images. Key points:

• Docker Hub is a public registry anyone can use
• Docker is configured to look for images on Docker Hub by default
• You can run your own private registry

Docker Registry Commands

• docker pull: Pull images from a registry
• docker push: Push images to a registry
• docker run: Run images from a registry

Docker Objects

When using Docker, you create and use:

• Images
• Containers
• Networks
• Volumes
• Plugins

Dockerfile

A Dockerfile is a text file that provides step-by-step instructions to build a Docker Image.

Installation Guide

Install Docker on Ubuntu

1. Update package list

sudo apt update

2. Install Docker

sudo apt install docker.io -y

Start Docker and Grant Access

1. Check Docker daemon status

sudo systemctl status docker

2. Start Docker daemon (if not running)

sudo systemctl start docker

3. Grant user access to Docker

sudo usermod -aG docker <username>

Replace <username> with your actual username (e.g., ubuntu)

Verify Installation

Run the hello-world test:

docker run hello-world

First Docker Image and Container

1. Build your first Docker image

docker build -t <username>/my-first-docker-image:latest .

2. Verify created image

docker images

3. Run your first container

docker run -it <username>/my-first-docker-image

Additional Resources

• Official Docker Documentation: https://docs.docker.com/get-docker/

Best Practices

• Always use specific image tags instead of latest
• Keep your images small
• Use multi-stage builds
• Implement proper security measures

Contributing

Feel free to contribute to this guide by submitting pull requests or reporting issues.

Contact

Name : Mohammad Asad Rahmani email : asadrahmani3101@gmail.com