Docker Installation Guide

Prerequisites

Before installing Docker, make sure your system meets the following requirements:

• 64-bit OS
• Virtualization enabled in BIOS
• Administrative (sudo/root) access
• Updated system packages

Install Docker on Linux (Ubuntu)

Step 1: Update System

sudo apt update
sudo apt upgrade -y

Step 2: Install Required Packages

sudo apt install -y ca-certificates curl gnupg lsb-release

Step 3: Add Docker GPG Key

sudo mkdir -p /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

Step 4: Add Docker Repository

echo \
"deb [arch=$(dpkg --print-architecture) \
signed-by=/etc/apt/keyrings/docker.gpg] \
https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Step 5: Install Docker Engine

sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Start and Enable Docker

sudo systemctl start docker
sudo systemctl enable docker

Verify Installation

docker --version

Test Docker with:

sudo docker run hello-world

Run Docker Without sudo (Optional)

sudo usermod -aG docker $USER
newgrp docker

Install Docker on Windows

1. Download Docker Desktop from the official website
2. Run the installer and follow instructions
3. Enable WSL 2 when prompted
4. Restart your system

Verify installation:

docker --version

Install Docker on macOS

1. Download Docker Desktop for Mac
2. Open the .dmg file and drag Docker to Applications
3. Launch Docker and complete setup

Verify installation:

docker --version

Basic Docker Commands

docker --version | Check Docker version

docker pull image_name | Download an image

docker run image_name | Run a container

docker ps | List running containers

docker stop container_id | Stop a container