flags+=" --port=${npd_port}"
    if [[ -n "${EXTRA_NPD_ARGS:-}" ]]; then
      flags+=" ${EXTRA_NPD_ARGS}"
    fi
  fi
  flags+=" --apiserver-override=https://${KUBERNETES_MASTER_NAME}?inClusterConfig=false&auth=/var/lib/node-problem-detector/kubeconfig"

  # Write the systemd service file for node problem detector.
  cat <<EOF >/etc/systemd/system/node-problem-detector.service
[Unit]