dockerinstallubuntu.sh

#!/bin/bash

set -e

echo "🔄 Updating system..."
sudo apt update

echo "🧹 Removing old Docker versions (if any)..."
sudo apt remove -y docker docker-engine docker.io containerd runc || true

echo "📦 Installing prerequisites..."
sudo apt install -y ca-certificates curl gnupg lsb-release

echo "🔑 Adding Docker 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

echo "➕ Adding 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

echo "📥 Installing Docker Engine..."
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

echo "🚀 Enabling Docker service..."
sudo systemctl enable docker
sudo systemctl start docker

echo "👤 Adding user to docker group..."
sudo usermod -aG docker $USER

echo "✅ Docker installation complete!"
echo "ℹ️  Log out and log back in to use Docker without sudo."