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docker/docker_ubuntu_install.sh

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+#!/bin/bash
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+# Function to display an error message and exit
+error_exit() {
+  echo "Error: $1" >&2
+  exit 1
+}
+
+# Update package index and upgrade system
+echo "Updating system packages..."
+sudo apt update && sudo apt upgrade -y || error_exit "Failed to update system packages."
+
+# Install required packages for repository setup
+echo "Installing prerequisites..."
+sudo apt install -y ca-certificates curl gnupg || error_exit "Failed to install prerequisites."
+
+# Create directory for Docker GPG key
+echo "Setting up GPG keyring..."
+sudo mkdir -p /etc/apt/keyrings || error_exit "Failed to create keyring directory."
+
+# Add Docker's official GPG key
+DOCKER_GPG_KEY=/etc/apt/keyrings/docker.gpg
+echo "Adding Docker GPG key..."
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o $DOCKER_GPG_KEY || error_exit "Failed to add Docker GPG key."
+sudo chmod a+r $DOCKER_GPG_KEY
+
+# Set up Docker repository
+echo "Adding Docker repository..."
+REPO_ENTRY="deb [arch=$(dpkg --print-architecture) signed-by=$DOCKER_GPG_KEY] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+if ! grep -Fxq "$REPO_ENTRY" /etc/apt/sources.list.d/docker.list; then
+  echo "$REPO_ENTRY" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null || error_exit "Failed to add Docker repository."
+fi
+
+# Update package index
+echo "Updating package index..."
+sudo apt update || error_exit "Failed to update package index."
+
+# Install Docker Engine, CLI, and dependencies
+echo "Installing Docker Engine and dependencies..."
+sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin || error_exit "Failed to install Docker packages."
+
+# Verify Docker installation
+echo "Verifying Docker installation..."
+if ! docker --version; then
+  error_exit "Docker installation verification failed."
+fi
+
+# Run a test container
+echo "Running Docker test container..."
+if ! sudo docker run --rm hello-world; then
+  error_exit "Docker test container failed to run."
+fi
+
+# Add current user to Docker group (if not already added)
+echo "Configuring Docker group..."
+if ! groups $USER | grep -q '\bdocker\b'; then
+  sudo usermod -aG docker $USER || error_exit "Failed to add user to Docker group."
+  echo "User added to Docker group. Please log out and back in for this change to take effect."
+else
+  echo "User is already in the Docker group."
+fi
+
+# Enable Docker service on boot
+echo "Enabling Docker service on boot..."
+sudo systemctl enable docker || error_exit "Failed to enable Docker service."
+
+# Success message
+echo "Docker installation completed successfully!"