docker installation script init

docker-install-deb.sh

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+#!/usr/bin/env bash
+#RUN AS ROOT/SUDO
+
+set -euo pipefail
+
+# Function to print messages
+info() { echo -e "\e[1;34m[INFO]\e[0m $*"; }
+error() { echo -e "\e[1;31m[ERROR]\e[0m $*" >&2; }
+
+# Check if running as root
+if (( EUID != 0 )); then
+    error "This script must be run as root (or via sudo)."
+    exit 1
+fi
+
+# Detect Debian codename automatically
+DEBIAN_CODENAME=$(lsb_release -cs 2>/dev/null || grep VERSION_CODENAME /etc/os-release | cut -d= -f2)
+if [ -z "$DEBIAN_CODENAME" ]; then
+    error "Could not detect Debian codename. Please specify manually."
+    exit 1
+fi
+info "Detected Debian codename: $DEBIAN_CODENAME"
+
+# 1. Update package index
+info "Updating package index..."
+apt update
+
+# 2. Install prerequisites
+info "Installing prerequisites..."
+apt install -y apt-transport-https ca-certificates curl gpg lsb-release
+
+# 3. Add Docker GPG key
+info "Adding Docker GPG key..."
+curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker.gpg
+
+# 4. Add Docker repository for detected Debian version
+ARCH=$(dpkg --print-architecture)
+info "Adding Docker repository for architecture: $ARCH..."
+echo "deb [arch=${ARCH} signed-by=/usr/share/keyrings/docker.gpg] https://download.docker.com/linux/debian ${DEBIAN_CODENAME} stable" \
+    > /etc/apt/sources.list.d/docker.list
+
+# 5. Update package index again to pick up Docker repo
+info "Updating package index (post repo addition)..."
+apt update
+
+# 6. Install Docker components
+info "Installing Docker components..."
+apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+# 7. Enable and start Docker service
+info "Enabling and starting Docker service..."
+systemctl enable docker
+systemctl start docker
+
+# 8. Verify Docker is running
+info "Verifying Docker status..."
+if systemctl is-active --quiet docker; then
+    info "Docker is active."
+else
+    error "Docker is not running!"
+    journalctl -u docker --no-pager | head -n 20
+    exit 1
+fi
+
+# 9. Test Docker installation
+info "Running hello-world container to test Docker..."
+docker run --rm hello-world
+
+# 10. Add non-root user to Docker group (if applicable)
+if [ -n "${SUDO_USER:-}" ]; then
+    info "Adding user '$SUDO_USER' to docker group..."
+    usermod -aG docker "$SUDO_USER"
+    info "You may need to logout/login or reboot for group changes to take effect."
+fi
+
+info "Docker installation completed successfully."