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📦 Installing Docker ​

Installing Docker on Ubuntu ​

Installing Docker on Ubuntu is as simple as installing any other software:

bash
# 1. Update package index
sudo apt update

# 2. Install dependencies
sudo apt install -y ca-certificates curl gnupg

# 3. Add Docker's 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

# 4. Add Docker repository
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

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

💡 Tip: 💡 Note: docker-compose-plugin is the built-in Compose plugin included with newer versions of Docker. You don't need to install docker-compose separately.

Installing Docker on CentOS ​

bash
# 1. Install dependencies
sudo yum install -y yum-utils

# 2. Add Docker repository
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

# 3. Install Docker
sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# 4. Start Docker
sudo systemctl start docker
sudo systemctl enable docker

Windows / macOS Installation ​

Windows and macOS users should download Docker Desktop:

  • Windows: Download Docker Desktop for Windows — WSL2 is required
  • macOS: Download Docker Desktop for Mac — separate versions for Intel and Apple Silicon

⚠️ Note: ⚠️ Windows users: it is strongly recommended to use the WSL2 backend instead of Hyper-V for much better performance! Docker Desktop will prompt you to choose during installation.

Post-Installation Configuration ​

bash
# Add current user to the docker group (run without sudo)
sudo usermod -aG docker $USER

# Takes effect after re-login, or temporarily use:
newgrp docker

# Verify installation
docker --version
Docker version 24.0.7, build afdd53b

docker compose version
Docker Compose version v2.21.0

# Run a test container
docker run hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.
...

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