How to Install Docker on Linux (Ubuntu/Debian)

# How to Install Docker on Linux (Ubuntu/Debian)

# Step 1: Remove old versions (if any)
sudo apt remove docker docker-engine docker.io containerd runc

# Step 2: Update package info and install dependencies
sudo apt update
sudo apt install apt-transport-https ca-certificates curl software-properties-common -y

# Step 3: Add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker.gpg

# Step 4: Add Docker repository
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/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: Update package info again
sudo apt update

# Step 6: Install Docker Engine and containerd
sudo apt install docker-ce docker-ce-cli containerd.io -y

# Step 7: Start and enable Docker service
sudo systemctl start docker
sudo systemctl enable docker

# Step 8: Verify Docker installation
docker --version

# Optional: Run Docker without sudo (logout/login required)
sudo usermod -aG docker $USER
newgrp docker