fix(grpc): disable grpc service discovery to prevent dns flooding

COLDTURNIP · COLDTURNIP · commit f5fbc4e21a77 · 2026-01-22T17:14:25.000+08:00
longhorn-12521

Signed-off-by: Raphanus Lo &lt;yunchang.lo@suse.com&gt;
diff --git a/pkg/util/grpcutil.go b/pkg/util/grpcutil.go
@@ -52,6 +52,9 @@ func Connect(endpoint string, tlsConfig *tls.Config, dialOptions ...grpc.DialOpt
 	// Code lifted from https://github.com/kubernetes-csi/csi-test/commit/6b8830bf5959a1c51c6e98fe514b22818b51eeeb
 	dialOptions = append(dialOptions, grpc.WithKeepaliveParams(keepalive.ClientParameters{Time: 30 * time.Second, PermitWithoutStream: true}))
 
+	// Disable gRPC service config discovery to prevent DNS flooding in Kubernetes
+	dialOptions = append(dialOptions, grpc.WithDisableServiceConfig())
+
 	return grpc.NewClient(address, dialOptions...)
 }
 

Original file line number	Diff line number	Diff line change
`@@ -52,6 +52,9 @@ func Connect(endpoint string, tlsConfig *tls.Config, dialOptions ...grpc.DialOpt`
`52`	`52`	`// Code lifted from https://github.com/kubernetes-csi/csi-test/commit/6b8830bf5959a1c51c6e98fe514b22818b51eeeb`
`53`	`53`	`dialOptions = append(dialOptions, grpc.WithKeepaliveParams(keepalive.ClientParameters{Time: 30 * time.Second, PermitWithoutStream: true}))`
`54`	`54`
	`55`	`+ // Disable gRPC service config discovery to prevent DNS flooding in Kubernetes`
	`56`	`+ dialOptions = append(dialOptions, grpc.WithDisableServiceConfig())`
	`57`	`+`
`55`	`58`	`return grpc.NewClient(address, dialOptions...)`
`56`	`59`	`}`
`57`	`60`