For this sample, we've already generated the server and client stubs from helloworld.proto.
$ go help gopath $ # ensure the PATH contains $GOPATH/bin $ export PATH=$PATH:$GOPATH/bin
$ go get -u github.com/grpc/grpc-common/go/greeter_client $ go get -u github.com/grpc/grpc-common/go/greeter_server
$ greeter_server &
$ greeter_client
1 First install protoc
2 Install the protoc Go plugin.
$ go get -a github.com/golang/protobuf/protoc-gen-go $ $ # from this dir; invoke protoc $ protoc -I ../protos ../protos/helloworld.proto --go_out=plugins=grpc:helloworld