A microservices demo using go-micro

  • By Go Micro
  • Last update: Dec 30, 2022
  • Comments: 1

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This application was forked from microservices-demo, used to demostrate how to build micro servics with go-micro.

Online Boutique

Online Boutique is a cloud-native microservices demo application. Online Boutique consists of a 11-tier microservices application. The application is a web-based e-commerce app where users can browse items, add them to the cart, and purchase them.

Google uses this application to demonstrate use of technologies like Kubernetes/GKE, Istio, Stackdriver, gRPC and OpenCensus. This application works on any Kubernetes cluster, as well as Google Kubernetes Engine. It’s easy to deploy with little to no configuration.

If you’re using this demo, please ★Star this repository to show your interest!


Home Page Checkout Screen
Screenshot of store homepage Screenshot of checkout screen

Other Deployment Options


Online Boutique is composed of 11 microservices written in different languages that talk to each other over gRPC. See the Development Principles doc for more information.

Architecture of microservices

Find Protocol Buffers Descriptions at the ./pb directory.

Service Language Description
frontend Go Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically.
cartservice Go Stores the items in the user's shopping cart in Redis and retrieves it.
productcatalogservice Go Provides the list of products from a JSON file and ability to search products and get individual products.
currencyservice Go Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service.
paymentservice Go Charges the given credit card info (mock) with the given amount and returns a transaction ID.
shippingservice Go Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock)
emailservice Go Sends users an order confirmation email (mock).
checkoutservice Go Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification.
recommendationservice Go Recommends other products based on what's given in the cart.
adservice Go Provides text ads based on given context words.
loadgenerator Go Continuously sends requests imitating realistic user shopping flows to the frontend.


  • Kubernetes/GKE: The app is designed to run on Kubernetes (both locally on "Docker for Desktop", as well as on the cloud with GKE).
  • gRPC: Microservices use a high volume of gRPC calls to communicate to each other.
  • Istio: Application works on Istio service mesh.
  • OpenCensus Tracing: Most services are instrumented using OpenCensus trace interceptors for gRPC/HTTP.
  • Cloud Operations (Stackdriver): Many services are instrumented with Profiling, Tracing and Debugging. In addition to these, using Istio enables features like Request/Response Metrics and Context Graph out of the box. When it is running out of Google Cloud, this code path remains inactive.
  • Skaffold: Application is deployed to Kubernetes with a single command using Skaffold.
  • Synthetic Load Generation: The application demo comes with a background job that creates realistic usage patterns on the website using Locust load generator.

Local Development

If you would like to contribute features or fixes to this app, see the Development Guide on how to build this demo locally.

Demos featuring Online Boutique




  • 1

    Makefile init fails

    During skaffold dev running RUN make init && go mod download fails with

    go: go-micro.dev/v4/cmd/protoc-gen-micro@v4: module go-micro.dev/v4@v4 found (v4.8.1), but does not contain package go-micro.dev/v4/cmd/protoc-gen-micro
    make: *** [Makefile:7: init] Error 1