adding validations on kubelet starting configurations

staging/src/k8s.io/apimachinery/pkg/util/validation/validation.go

@@ -188,6 +188,14 @@ func IsValidPortNum(port int) []string {
 	return []string{InclusiveRangeError(1, 65535)}
 }
 
+// IsInRange tests that the argument is in an inclusive range.
+func IsInRange(value int, min int, max int) []string {
+	if value >= min && value <= max {
+		return nil
+	}
+	return []string{InclusiveRangeError(min, max)}
+}
+
 // Now in libcontainer UID/GID limits is 0 ~ 1<<31 - 1
 // TODO: once we have a type for UID/GID we should make these that type.
 const (

staging/src/k8s.io/apimachinery/pkg/util/validation/validation_test.go

@@ -154,6 +154,30 @@ func TestIsValidPortNum(t *testing.T) {
 	}
 }
 
+func TestIsInRange(t *testing.T) {
+	goodValues := []struct {
+		value int
+		min   int
+		max   int
+	}{{1, 0, 10}, {5, 5, 20}, {25, 10, 25}}
+	for _, val := range goodValues {
+		if msgs := IsInRange(val.value, val.min, val.max); len(msgs) > 0 {
+			t.Errorf("expected no errors for %#v, but got %v", val, msgs)
+		}
+	}
+
+	badValues := []struct {
+		value int
+		min   int
+		max   int
+	}{{1, 2, 10}, {5, -4, 2}, {25, 100, 120}}
+	for _, val := range badValues {
+		if msgs := IsInRange(val.value, val.min, val.max); len(msgs) == 0 {
+			t.Errorf("expected errors for %#v", val)
+		}
+	}
+}
+
 func createGroupIDs(ids ...int64) []int64 {
 	var output []int64
 	for _, id := range ids {