drain.go

err = drain.Drain(clientset, []*corev1.Node{node}, &drain.DrainOptions{
	IgnoreDaemonsets:   true,
	DeleteLocalData:    true,
	GracePeriodSeconds: -1,
	Force:              true,
	Logger:             ilog.New(),
	// Timeout of 0 means infinite. The draining is pretty quick, so I expect it to complete within
	// the execution duration of the lambda.
	Timeout: 0,
})
if err != nil {
	panic(err)
}