Have Http Probe report "Unhealthy" on connection failure instead of "Unknown".

pkg/client/kubelet_test.go

@@ -131,10 +131,10 @@ func TestNewKubeletClient(t *testing.T) {
 
 	host := "127.0.0.1"
 	healthStatus, err := client.HealthCheck(host)
-	if healthStatus != health.Unknown {
-		t.Errorf("Expected %v and got %v.", health.Unknown, healthStatus)
+	if healthStatus != health.Unhealthy {
+		t.Errorf("Expected %v and got %v.", health.Unhealthy, healthStatus)
 	}
-	if err == nil {
-		t.Error("Expected a non nil error")
+	if err != nil {
+		t.Error("Expected a nil error")
 	}
 }

pkg/health/health_test.go

@@ -36,7 +36,7 @@ func TestHealthChecker(t *testing.T) {
 		health Status
 	}{
 		{http.StatusOK, Healthy},
-		{statusServerEarlyShutdown, Unknown},
+		{statusServerEarlyShutdown, Unhealthy},
 		{http.StatusBadRequest, Unhealthy},
 		{http.StatusBadGateway, Unhealthy},
 		{http.StatusInternalServerError, Unhealthy},
@@ -69,7 +69,7 @@ func TestHealthChecker(t *testing.T) {
 		}
 		hc := NewHealthChecker()
 		health, err := hc.HealthCheck("test", "", api.PodStatus{}, container)
-		if err != nil && tt.health != Unknown {
+		if err != nil && tt.health != Unhealthy {
 			t.Errorf("Unexpected error: %v", err)
 		}
 		if health != tt.health {

pkg/health/http.go

@@ -88,13 +88,13 @@ func formatURL(host string, port int, path string) string {
 
 // DoHTTPCheck checks if a GET request to the url succeeds.
 // If the HTTP response code is successful (i.e. 400 > code >= 200), it returns Healthy.
-// If the HTTP response code is unsuccessful, it returns Unhealthy.
-// It returns Unknown and err if the HTTP communication itself fails.
+// If the HTTP response code is unsuccessful or HTTP communication fails, it returns Unhealthy.
 // This is exported because some other packages may want to do direct HTTP checks.
 func DoHTTPCheck(url string, client HTTPGetInterface) (Status, error) {
 	res, err := client.Get(url)
 	if err != nil {
-		return Unknown, err
+		glog.V(1).Infof("HTTP probe error: %v", err)
+		return Unhealthy, nil
 	}
 	defer res.Body.Close()
 	if res.StatusCode >= http.StatusOK && res.StatusCode < http.StatusBadRequest {