Can now create a node worker

alpine/rootfs-extra/opt/scripts/apply-node-config.sh

@@ -0,0 +1,149 @@
+#!/bin/bash
+set -euo pipefail
+
+CONFIG_DIR="${CONFIG_DIR:-/opt/monok8s/config}"
+NODE_ENV="${NODE_ENV:-$CONFIG_DIR/node.env}"
+
+log() {
+    echo "[monok8s-node] $*"
+}
+
+fail() {
+    echo "[monok8s-node] ERROR: $*" >&2
+    exit 1
+}
+
+need_cmd() {
+    command -v "$1" >/dev/null 2>&1 || fail "missing required command: $1"
+}
+
+require_file() {
+    [ -f "$1" ] || fail "required file not found: $1"
+}
+
+load_config() {
+    require_file "$NODE_ENV"
+
+    # shellcheck disable=SC1090
+    . "$NODE_ENV"
+
+    HOSTNAME="${HOSTNAME:-}"
+    MGMT_IFACE="${MGMT_IFACE:-}"
+    MGMT_ADDRESS="${MGMT_ADDRESS:-}"
+    MGMT_GATEWAY="${MGMT_GATEWAY:-}"
+}
+
+validate_config() {
+    [ -n "$HOSTNAME" ] || fail "HOSTNAME is required"
+    [ -n "$MGMT_IFACE" ] || fail "MGMT_IFACE is required"
+    [ -n "$MGMT_ADDRESS" ] || fail "MGMT_ADDRESS is required"
+
+    case "$MGMT_ADDRESS" in
+        */*)
+            ;;
+        *)
+            fail "MGMT_ADDRESS must include a CIDR prefix, example: 10.0.0.13/24"
+            ;;
+    esac
+}
+
+check_prereqs() {
+    need_cmd ip
+    need_cmd hostname
+    need_cmd grep
+    need_cmd awk
+    need_cmd cut
+    need_cmd mkdir
+    need_cmd printf
+    need_cmd cat
+}
+
+configure_mgmt_interface() {
+    local addr_ip
+
+    ip link show "$MGMT_IFACE" >/dev/null 2>&1 || fail "interface not found: $MGMT_IFACE"
+
+    log "bringing up interface: $MGMT_IFACE"
+    ip link set "$MGMT_IFACE" up
+
+    addr_ip="${MGMT_ADDRESS%/*}"
+
+    if ip -o addr show dev "$MGMT_IFACE" | awk '{print $4}' | cut -d/ -f1 | grep -Fx "$addr_ip" >/dev/null 2>&1; then
+        log "address already present on $MGMT_IFACE: $MGMT_ADDRESS"
+    else
+        log "assigning $MGMT_ADDRESS to $MGMT_IFACE"
+        ip addr add "$MGMT_ADDRESS" dev "$MGMT_IFACE"
+    fi
+
+    if [ -n "${MGMT_GATEWAY:-}" ]; then
+        log "ensuring default route via $MGMT_GATEWAY"
+        ip route replace default via "$MGMT_GATEWAY" dev "$MGMT_IFACE"
+    fi
+}
+
+set_hostname_if_needed() {
+    local current_hostname
+
+    current_hostname="$(hostname 2>/dev/null || true)"
+
+    if [ "$current_hostname" != "$HOSTNAME" ]; then
+        log "setting hostname to $HOSTNAME"
+
+        hostname "$HOSTNAME"
+
+        mkdir -p /etc
+        printf '%s\n' "$HOSTNAME" > /etc/hostname
+
+        if [ -f /etc/hosts ]; then
+            if ! grep -Eq "[[:space:]]$HOSTNAME([[:space:]]|$)" /etc/hosts; then
+                printf '127.0.0.1\tlocalhost %s\n' "$HOSTNAME" >> /etc/hosts
+            fi
+        else
+            cat > /etc/hosts <<EOF
+127.0.0.1 localhost $HOSTNAME
+EOF
+        fi
+    else
+        log "hostname already set: $HOSTNAME"
+    fi
+}
+
+ensure_ip_forward() {
+    local current
+
+    current="$(cat /proc/sys/net/ipv4/ip_forward 2>/dev/null || echo 0)"
+    if [ "$current" != "1" ]; then
+        log "enabling IPv4 forwarding"
+        echo 1 > /proc/sys/net/ipv4/ip_forward
+    fi
+
+    mkdir -p /etc/sysctl.d
+    cat > /etc/sysctl.d/99-monok8s.conf <<'EOF'
+net.ipv4.ip_forward = 1
+EOF
+}
+
+print_summary() {
+    log "node configuration applied"
+    log "hostname: $HOSTNAME"
+    log "interface: $MGMT_IFACE"
+    log "address: $MGMT_ADDRESS"
+    if [ -n "${MGMT_GATEWAY:-}" ]; then
+        log "gateway: $MGMT_GATEWAY"
+    else
+        log "gateway: <not set>"
+    fi
+}
+
+main() {
+    load_config
+    validate_config
+    check_prereqs
+
+    ensure_ip_forward
+    configure_mgmt_interface
+    set_hostname_if_needed
+    print_summary
+}
+
+main "$@"