How to Get Ready Docker for Windows

Docker is a powerful containerization platform that simplifies software deployment by bundling applications and their dependencies into lightweight, portable containers. Here’s a detailed guide to getting Docker ready for Windows.

Why Use Docker for Windows?

1. Consistent Environment:

   • Avoid the “works on my machine” issue by ensuring consistent environments across development, testing, and production.
   • Applications run inside containers with all required dependencies.

2. Native Windows Support:

   • Docker now runs natively on Windows, utilizing the Windows kernel. No need for Linux or additional layers, ensuring better performance and simplicity.

3. Comprehensive Toolset:

   • Docker on Windows supports native networking and includes tools like Docker CLI, Docker Compose, and more, enabling seamless development.

Windows Prerequisites for Docker

1. Operating System:

   • Requires Windows 10 Pro, Enterprise, or Education (64-bit).
   • For older versions, Docker Toolbox is required instead of Docker Desktop.

2. Enable Hyper-V:

   • Docker for Windows requires Hyper-V, a type-1 hypervisor.
   • Ensure Hyper-V and virtualization are enabled in the BIOS.

Steps to Install Docker on Windows

1. Download Docker Desktop:

   • Visit the official Docker website and download the installer for Windows.

2. Run the Installer:

   • Double-click the installer and follow the setup wizard.
   • Accept the license agreement and complete the installation process.

3. Launch Docker Desktop:

   • Open the Docker Desktop application.
   • Wait for the whale icon in the system tray to stabilize, indicating Docker is ready.

4. Verify Installation:

   • Open a terminal (e.g., PowerShell) and run the command:
     bash

      

     docker --version

     This should display the installed Docker version.

Key Docker Components

• Docker Engine: Includes the Docker daemon, REST API, and CLI for managing containers.
• Docker Compose: Simplifies multi-container management with a single command (docker-compose up).
• Docker Machine: Manages Docker installations on remote servers.
• Kitematic: Provides a graphical interface for managing Docker containers.

Docker Terminologies

1. Docker Images:

   • Templates containing application dependencies.
   • Created from a Dockerfile.

2. Docker Containers:

   • Runtime instances of Docker images.

3. Docker Registry:

   • A repository (e.g., Docker Hub) to store and share Docker images.

4. Docker Swarm:

   • A clustering and orchestration tool for Docker containers.

5. Docker Compose:

   • Orchestrates multiple containers simultaneously.

Demo: Create a Python Web Application Using Docker Compose

Objective: Develop a simple web app using Flask and Redis.

1. Prepare the Environment:

   • Create a directory with the following files:
     • app.py: A Flask-based web application.
     • requirements.txt: Lists dependencies (Flask and Redis).
     • Dockerfile: Specifies the environment for the container.
     • docker-compose.yml: Configures services (web app and Redis).

2. Build and Run the Application:

   • Execute the following command:
     bash

     docker-compose up

      

      
   • Access the application in your browser.

3. Monitor Containers:

   • Use Docker Desktop or Kitematic to view and manage running containers.

Important Notes

• VirtualBox Conflict: Docker Desktop uses Hyper-V, which conflicts with VirtualBox. Ensure VirtualBox is disabled or not running simultaneously with Docker.
• Networking: Docker Desktop enables native networking, allowing seamless interaction between containers and host systems.

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• Flexible online and classroom training options.
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