Include original error in the error message.

cmd/kube-apiserver/app/server.go

@@ -452,7 +452,8 @@ func BuildGenericConfig(s *options.ServerRunOptions, proxyTransport *http.Transp
 		// groups. This leads to a nil client above and undefined behaviour further down.
 		//
 		// TODO: get rid of KUBE_API_VERSIONS or define sane behaviour if set
-		glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q. KUBE_API_VERSIONS is only for testing. Things will break.", kubeAPIVersions)
+		glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q: %v. KUBE_API_VERSIONS is only for testing. Things will break.",
+			kubeAPIVersions, err)
 	}
 
 	kubeClientConfig := genericConfig.LoopbackClientConfig

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/apiserver.go

@@ -162,7 +162,8 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 		// groups. This leads to a nil client above and undefined behaviour further down.
 		//
 		// TODO: get rid of KUBE_API_VERSIONS or define sane behaviour if set
-		glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q. KUBE_API_VERSIONS is only for testing. Things will break.", kubeAPIVersions)
+		glog.Errorf("Failed to create clientset with KUBE_API_VERSIONS=%q: %v. KUBE_API_VERSIONS is only for testing. Things will break.",
+			kubeAPIVersions, err)
 	}
 	s.Informers = internalinformers.NewSharedInformerFactory(crdClient, 5*time.Minute)