Docker Installation & Setup Guide ⚙️

Complete guide to installing Docker Engine and Docker Desktop across Ubuntu Linux, macOS, and Windows.

---

1. Installing Docker Engine on Linux (Ubuntu / Debian)

# Update existing packages
sudo apt update && sudo apt install -y ca-certificates curl gnupg

# Add Docker official GPG key
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

# Add repository to Apt sources
echo   "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu   $(. /etc/os-release && echo "$VERSION_CODENAME") stable" |   sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker Engine & Compose
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Verify Installation
sudo docker run hello-world

Post-Installation: Run Docker without sudo

# Add current user to docker group
sudo usermod -aG docker $USER

# Apply group changes
newgrp docker

---

2. Installing Docker on macOS

Option 1: Via Homebrew Cask

brew install --cask docker

Option 2: Docker Desktop Installer

1. Download installer from docker.com/products/docker-desktop.
2. Drag Docker.app to Applications folder and launch.

---

3. Installing Docker on Windows

Prerequisites

• Enable WSL 2 (Windows Subsystem for Linux).

# Run in PowerShell as Administrator
wsl --install

Installation Steps

1. Download Docker Desktop for Windows installer.
2. Run .exe installer and ensure Use WSL 2 instead of Hyper-V is checked.
3. Restart computer upon completion.