Don't log 'apiserver disabled' error sent by etcd-only nodes

pkg/server/router.go

@@ -104,14 +104,14 @@ func apiserver(runtime *config.ControlRuntime) http.Handler {
 		if runtime != nil && runtime.APIServer != nil {
 			runtime.APIServer.ServeHTTP(resp, req)
 		} else {
-			util.SendError(util.ErrNotReady, resp, req, http.StatusServiceUnavailable)
+			util.SendError(util.ErrAPINotReady, resp, req, http.StatusServiceUnavailable)
 		}
 	})
 }
 
 func apiserverDisabled() http.Handler {
 	return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
-		util.SendError(errors.New("apiserver disabled"), resp, req, http.StatusServiceUnavailable)
+		util.SendError(util.ErrAPIDisabled, resp, req, http.StatusServiceUnavailable)
 	})
 }
 

pkg/util/apierrors.go

@@ -15,7 +15,8 @@ import (
 	"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
 )
 
-var ErrNotReady = errors.New("apiserver not ready")
+var ErrAPINotReady = errors.New("apiserver not ready")
+var ErrAPIDisabled = errors.New("apiserver disabled")
 
 // SendErrorWithID sends and logs a random error ID so that logs can be correlated
 // between the REST API (which does not provide any detailed error output, to avoid
@@ -36,8 +37,8 @@ func SendError(err error, resp http.ResponseWriter, req *http.Request, status ..
 		code = http.StatusInternalServerError
 	}
 
-	// Don't log "apiserver not ready" errors, they are frequent during startup
-	if !errors.Is(err, ErrNotReady) {
+	// Don't log "apiserver not ready" or "apiserver disabled" errors, they are frequent during startup
+	if !errors.Is(err, ErrAPINotReady) && !errors.Is(err, ErrAPIDisabled) {
 		logrus.Errorf("Sending HTTP %d response to %s: %v", code, req.RemoteAddr, err)
 	}