Installing Docker

In this lesson by Online Learner, you will learn how to install Docker on Windows, macOS, and Linux (Ubuntu) step by step.

Install Docker on Windows

1. Download Docker Desktop:

   • Visit https://www.docker.com/products/docker-desktop/
   • Click Download for Windows.

2. Run the Installer:

   • Double-click the downloaded .exe file.
   • Follow the installation wizard and click Install.
   • Make sure WSL 2 (Windows Subsystem for Linux) is enabled.

3. Verify Installation:

   docker --version

   Expected output:

   Docker version 25.0.3, build 4debf41

Install Docker on macOS

1. Download Docker Desktop for Mac:

   • Visit https://www.docker.com/products/docker-desktop/
   • Choose Mac with Apple Silicon or Mac with Intel Chip.

2. Install:

   • Open the downloaded .dmg file.
   • Drag the Docker icon to your Applications folder.
   • Open Docker from Applications and follow the setup steps.

3. Verify Installation:

   docker --version

Install Docker on Ubuntu (Linux)

1. Update package index:

   sudo apt update

2. Install required dependencies:

   sudo apt install apt-transport-https ca-certificates curl software-properties-common -y

3. Add Docker GPG key:

   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

4. Add Docker repository:

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

5. Install Docker:

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

6. Start and Enable Docker:

   sudo systemctl start docker
   sudo systemctl enable docker

7. Verify Installation:

   docker --version
   docker run hello-world

Run Docker Without sudo (Linux)

sudo usermod -aG docker $USER
newgrp docker

Log out and back in for this change to take effect.

Useful Post-Install Commands

Summary

• Docker Desktop is available for Windows and macOS.
• On Linux, Docker is installed via the terminal using apt.
• Always verify with docker --version and docker run hello-world.