Docker on Linux

Installation

Note: Do not use Docker Desktop for Linux. Install Docker Engine directly.

Step 1 — Set up repository

Open a terminal and run:

sudo apt-get update
sudo apt-get install ca-certificates curl gnupg lsb-release

Add Docker’s official 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

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 2 — Install Docker Engine

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

Step 3 — Manage Docker as non-root user

sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker

Verify Installation

Open a terminal and run:

docker --version
docker run hello-world