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172
enable_wol_proxmox.sh
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172
enable_wol_proxmox.sh
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#!/usr/bin/env bash
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# Enable Wake-on-LAN on the primary network interface of a Proxmox/Debian host
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# Automates: https://i12bretro.github.io/tutorials/0608.html
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# - Installs ethtool
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# - Detects the primary network interface
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# - Checks WOL support
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# - Enables WOL and configures persistence via /etc/network/interfaces
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# - Verifies configuration
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# - Prints the MAC address and hostname
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set -euo pipefail
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# --- Helper functions --------------------------------------------------------
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err() {
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echo "ERROR: $*" >&2
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exit 1
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}
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info() {
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echo "[*] $*"
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}
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# --- Preconditions -----------------------------------------------------------
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if [[ $EUID -ne 0 ]]; then
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err "This script must be run as root (sudo)."
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fi
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if ! command -v ip >/dev/null 2>&1; then
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err "The 'ip' command is required but not found."
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fi
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# --- Install ethtool ---------------------------------------------------------
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if ! command -v ethtool >/dev/null 2>&1; then
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info "Installing ethtool..."
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apt-get update -y >/dev/null
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apt-get install -y ethtool >/dev/null
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else
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info "ethtool already installed."
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fi
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# --- Detect primary network interface ----------------------------------------
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# 1) Try to get interface from default route
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PRIMARY_IF=$(ip route 2>/dev/null | awk '/default/ {print $5; exit}')
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# 2) Fallback: first interface with a private IPv4 address
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if [[ -z "${PRIMARY_IF:-}" ]]; then
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PRIMARY_IF=$(ip -o -4 addr show scope global | \
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awk '
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{
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split($4, a, "/");
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ip = a[1];
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if (ip ~ /^10\./ ||
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ip ~ /^192\.168\./ ||
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ip ~ /^172\.(1[6-9]|2[0-9]|3[0-1])\./) {
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print $2;
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exit;
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}
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}')
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fi
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[[ -n "${PRIMARY_IF:-}" ]] || err "Could not automatically determine primary network interface."
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info "Detected primary interface: ${PRIMARY_IF}"
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# --- Get MAC address & IP ----------------------------------------------------
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MAC_ADDR=$(ip -o link show "$PRIMARY_IF" | awk '{for (i=1; i<=NF; i++) if ($i=="link/ether") print $(i+1)}')
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IP_ADDR=$(ip -o -4 addr show "$PRIMARY_IF" | awk '{print $4}')
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[[ -n "${MAC_ADDR:-}" ]] || err "Could not determine MAC address for interface ${PRIMARY_IF}."
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[[ -n "${IP_ADDR:-}" ]] || info "No IPv4 address detected on ${PRIMARY_IF} (continuing anyway)."
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info "Interface ${PRIMARY_IF} MAC: ${MAC_ADDR}"
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[[ -n "${IP_ADDR:-}" ]] && info "Interface ${PRIMARY_IF} IP: ${IP_ADDR}"
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# --- Check WOL support -------------------------------------------------------
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info "Checking WOL support on ${PRIMARY_IF}..."
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ETHTOOL_OUTPUT=$(ethtool "$PRIMARY_IF" 2>/dev/null || true)
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[[ -n "$ETHTOOL_OUTPUT" ]] || err "ethtool failed on ${PRIMARY_IF}. Does this interface exist and support ethtool?"
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SUPPORTS_WOL=$(awk -F: '/Supports Wake-on/ {gsub(/ /,"",$2); print $2}' <<<"$ETHTOOL_OUTPUT")
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if [[ "$SUPPORTS_WOL" != *g* ]]; then
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err "Interface ${PRIMARY_IF} does NOT support Wake-on: g (Supports Wake-on: ${SUPPORTS_WOL}). Aborting."
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fi
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info "Interface ${PRIMARY_IF} supports Wake-on: g."
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# --- Enable WOL immediately --------------------------------------------------
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info "Enabling WOL (g) on ${PRIMARY_IF} now..."
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ethtool -s "$PRIMARY_IF" wol g
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# --- Configure persistence in /etc/network/interfaces ------------------------
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INTERFACES_FILE="/etc/network/interfaces"
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if [[ ! -f "$INTERFACES_FILE" ]]; then
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err "${INTERFACES_FILE} not found. Your system may be using another network config method (e.g., systemd-networkd, Netplan)."
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fi
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# Backup the file
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BACKUP_FILE="${INTERFACES_FILE}.bak-$(date +%F-%H%M%S)"
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cp "$INTERFACES_FILE" "$BACKUP_FILE"
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info "Backed up ${INTERFACES_FILE} to ${BACKUP_FILE}"
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# If an ethernet-wol or ethtool post-up line already exists for this interface, don't duplicate
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if grep -Eq "ethernet-wol g" "$INTERFACES_FILE" || \
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grep -Eq "ethtool -s ${PRIMARY_IF} wol g" "$INTERFACES_FILE"; then
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info "WOL persistence settings already present in ${INTERFACES_FILE}; not adding again."
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else
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info "Adding 'ethernet-wol g' under iface ${PRIMARY_IF} in ${INTERFACES_FILE}..."
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# Check if iface stanza exists
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if grep -Eq "^iface[[:space:]]+${PRIMARY_IF}[[:space:]]" "$INTERFACES_FILE"; then
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# Insert 'ethernet-wol g' directly after the iface line for this interface
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awk -v iface="$PRIMARY_IF" '
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{
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print $0
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if ($1 == "iface" && $2 == iface && !seen) {
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print " ethernet-wol g"
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seen = 1
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}
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}
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' "$INTERFACES_FILE" > "${INTERFACES_FILE}.tmp"
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mv "${INTERFACES_FILE}.tmp" "$INTERFACES_FILE"
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info "Updated ${INTERFACES_FILE} to include ethernet-wol g for ${PRIMARY_IF}."
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else
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info "No iface stanza for ${PRIMARY_IF} found in ${INTERFACES_FILE}."
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info "Not modifying the file to avoid breaking your network configuration."
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info "You may need to manually add 'ethernet-wol g' to the appropriate iface section."
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fi
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fi
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# --- Verify WOL is enabled ---------------------------------------------------
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info "Verifying WOL is enabled on ${PRIMARY_IF}..."
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VERIFY_OUTPUT=$(ethtool "$PRIMARY_IF")
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WAKE_ON=$(awk -F: '/Wake-on/ {gsub(/ /,"",$2); print $2}' <<<"$VERIFY_OUTPUT")
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if [[ "$WAKE_ON" != "g" ]]; then
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err "WOL verification failed: Wake-on is '${WAKE_ON}', expected 'g'. Check BIOS settings and /etc/network/interfaces."
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fi
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info "WOL verification succeeded: Wake-on is '${WAKE_ON}'."
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# --- Final summary -----------------------------------------------------------
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HOSTNAME=$(hostname)
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echo
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echo "==========================================="
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echo " Wake-on-LAN Configuration Summary"
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echo "==========================================="
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echo " Hostname : ${HOSTNAME}"
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echo " Interface : ${PRIMARY_IF}"
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echo " MAC : ${MAC_ADDR}"
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[[ -n "${IP_ADDR:-}" ]] && echo " IP : ${IP_ADDR}"
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echo " Wake-on : ${WAKE_ON}"
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echo "==========================================="
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echo "NOTE: Make sure WOL is enabled in your system BIOS/UEFI."
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echo
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exit 0
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