Vitess Patch to allow vttablets to bind to specific addresses.

v15_address_bind.patch

diff --git a/go/cmd/vttablet/vttablet.go b/go/cmd/vttablet/vttablet.go
index f9c43bd2a2..30d6564601 100644
--- a/go/cmd/vttablet/vttablet.go
+++ b/go/cmd/vttablet/vttablet.go
@@ -136,6 +136,7 @@ func main() {
 		// tm uses ts. So, it should be closed after tm.
 		ts.Close()
 	})
+	servenv.Address = tablet.Hostname
 
 	servenv.RunDefault()
 }
diff --git a/go/vt/servenv/grpc_server.go b/go/vt/servenv/grpc_server.go
index 97749bf7ef..737ee4523b 100644
--- a/go/vt/servenv/grpc_server.go
+++ b/go/vt/servenv/grpc_server.go
@@ -263,7 +263,7 @@ func interceptors() []grpc.ServerOption {
 	return interceptors.Build()
 }
 
-func serveGRPC() {
+func serveGRPC(address string) {
 	if grpccommon.EnableGRPCPrometheus() {
 		grpc_prometheus.Register(GRPCServer)
 		grpc_prometheus.EnableHandlingTimeHistogram()
@@ -286,7 +286,7 @@ func serveGRPC() {
 
 	// listen on the port
 	log.Infof("Listening for gRPC calls on port %v", gRPCPort)
-	listener, err := net.Listen("tcp", fmt.Sprintf(":%d", gRPCPort))
+	listener, err := net.Listen("tcp", fmt.Sprintf("%v:%d", address, gRPCPort))
 	if err != nil {
 		log.Exitf("Cannot listen on port %v for gRPC: %v", gRPCPort, err)
 	}
diff --git a/go/vt/servenv/run.go b/go/vt/servenv/run.go
index 82dfc285ef..8a9d896c89 100644
--- a/go/vt/servenv/run.go
+++ b/go/vt/servenv/run.go
@@ -38,14 +38,14 @@ var (
 
 // Run starts listening for RPC and HTTP requests,
 // and blocks until it the process gets a signal.
-func Run(port int) {
+func Run(address string, port int) {
 	populateListeningURL(int32(port))
 	createGRPCServer()
 	onRunHooks.Fire()
-	serveGRPC()
+	serveGRPC(address)
 	serveSocketFile()
 
-	l, err := net.Listen("tcp", fmt.Sprintf(":%v", port))
+	l, err := net.Listen("tcp", fmt.Sprintf("%v:%v", address, port))
 	if err != nil {
 		log.Exit(err)
 	}
diff --git a/go/vt/servenv/servenv.go b/go/vt/servenv/servenv.go
index f0144359d7..840ab86099 100644
--- a/go/vt/servenv/servenv.go
+++ b/go/vt/servenv/servenv.go
@@ -60,6 +60,7 @@ import (
 var (
 	// port is part of the flags used when calling RegisterDefaultFlags.
 	port int
+	Address string
 
 	// mutex used to protect the Init function
 	mu sync.Mutex
@@ -103,6 +104,8 @@ func Init() {
 	mu.Lock()
 	defer mu.Unlock()
 
+	Address = ""
+
 	// Ignore SIGPIPE if specified
 	// The Go runtime catches SIGPIPE for us on all fds except stdout/stderr
 	// See https://golang.org/pkg/os/signal/#hdr-SIGPIPE
@@ -253,7 +256,7 @@ func Port() int {
 
 // RunDefault calls Run() with the parameters from the flags.
 func RunDefault() {
-	Run(port)
+	Run(Address, port)
 }
 
 var (