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