etcdmain: add 'grpc-keepalive-*' flags

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

etcdmain/config.go

@@ -143,6 +143,9 @@ func newConfig() *config {
 	fs.Int64Var(&cfg.QuotaBackendBytes, "quota-backend-bytes", cfg.QuotaBackendBytes, "Raise alarms when backend size exceeds the given quota. 0 means use the default quota.")
 	fs.UintVar(&cfg.MaxTxnOps, "max-txn-ops", cfg.MaxTxnOps, "Maximum number of operations permitted in a transaction.")
 	fs.UintVar(&cfg.MaxRequestBytes, "max-request-bytes", cfg.MaxRequestBytes, "Maximum client request size in bytes the server will accept.")
+	fs.DurationVar(&cfg.GRPCKeepAliveMinTime, "grpc-keepalive-min-time", cfg.Config.GRPCKeepAliveMinTime, "Minimum interval duration that a client should wait before pinging server.")
+	fs.DurationVar(&cfg.GRPCKeepAliveInterval, "grpc-keepalive-interval", cfg.Config.GRPCKeepAliveInterval, fmt.Sprintf("Frequency duration of server-to-client ping to check if a connection is alive (default %v, close non-responsive client transport after %v + --grpc-keepalive-timeout).", cfg.Config.GRPCKeepAliveInterval, cfg.Config.GRPCKeepAliveInterval))
+	fs.DurationVar(&cfg.GRPCKeepAliveTimeout, "grpc-keepalive-timeout", cfg.Config.GRPCKeepAliveTimeout, "Additional duration of wait before closing a non-responsive connection.")
 
 	// clustering
 	fs.Var(flags.NewURLsValue(embed.DefaultInitialAdvertisePeerURLs), "initial-advertise-peer-urls", "List of this member's peer URLs to advertise to the rest of the cluster.")

etcdmain/help.go

@@ -70,6 +70,12 @@ member flags:
 		maximum number of operations permitted in a transaction.
 	--max-request-bytes '1572864'
 		maximum client request size in bytes the server will accept.
+	--grpc-keepalive-min-time '5s'
+		minimum duration interval that a client should wait before pinging server.
+	--grpc-keepalive-interval '2h'
+		frequency duration of server-to-client ping to check if a connection is alive.
+	--grpc-keepalive-timeout '20s'
+		additional duration of wait before closing a non-responsive connection.
 
 clustering flags: