# Hipster Shop: Cloud-Native Microservices Demo Application This project contains a 10-tier microservices application. The application is a web-based e-commerce app called **“Hipster Shop”** 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 (such as a local one), 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! > 👓**Note to Googlers:** Please fill out the form at [go/microservices-demo](http://go/microservices-demo) if you are using this application. ## Screenshots | Home Page | Checkout Screen | |-----------|-----------------| | [![Screenshot of store homepage](./docs/img/hipster-shop-frontend-1.png)](./docs/img/hipster-shop-frontend-1.png) | [![Screenshot of checkout screen](./docs/img/hipster-shop-frontend-2.png)](./docs/img/hipster-shop-frontend-2.png) | ## Service Architecture **Hipster Shop** is composed of many microservices written in different languages that talk to each other over gRPC. [![Architecture of microservices](./docs/img/architecture-diagram.png)](./docs/img/architecture-diagram.png) Find **Protocol Buffers Descriptions** at the [`./pb` directory](./pb). | Service | Language | Description | |---------|----------|-------------| | [frontend](./src/frontend) | Go | Exposes an HTTP server to serve the website. Does not require signup/login and generates session IDs for all users automatically. | | [cartservice](./src/cartservice) | C# | Stores the items in the user's shipping cart in Redis and retrieves it. | | [productcatalogservice](./src/productcatalogservice) | Go | Provides the list of products from a JSON file and ability to search products and get individual products. | | [currencyservice](./src/currencyservice) | Node.js | Converts one money amount to another currency. Uses real values fetched from European Central Bank. It's the highest QPS service. | | [paymentservice](./src/paymentservice) | Node.js | Charges the given credit card info (mock) with the given amount and returns a transaction ID. | | [shippingservice](./src/shippingservice) | Go | Gives shipping cost estimates based on the shopping cart. Ships items to the given address (mock) | | [emailservice](./src/emailservice) | Python | Sends users an order confirmation email (mock). | | [checkoutservice](./src/checkoutservice) | Go | Retrieves user cart, prepares order and orchestrates the payment, shipping and the email notification. | | [recommendationservice](./src/recommendationservice) | Python | Recommends other products based on what's given in the cart. | | [adservice](./src/adservice) | Java | Provides text ads based on given context words. | | [loadgenerator](./src/loadgenerator) | Python/Locust | Continuously sends requests imitating realistic user shopping flows to the frontend. | ## Features - **[Kubernetes](https://kubernetes.io)/[GKE](https://cloud.google.com/kubernetes-engine/):** The app is designed to run on Kubernetes (both locally on "Docker for Desktop", as well as on the cloud with GKE). - **[gRPC](https://grpc.io):** Microservices use a high volume of gRPC calls to communicate to each other. - **[Istio](https://istio.io):** Application works on Istio service mesh. - **[OpenCensus](https://opencensus.io/) Tracing:** Most services are instrumented using OpenCensus trace interceptors for gRPC/HTTP. - **[Stackdriver APM](https://cloud.google.com/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](https://github.com/GoogleContainerTools/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](https://locust.io/) load generator. ## Installation > **Note:** that the first build can take up to 20-30 minutes. Consequent builds > will be faster. ### Option 1: Running locally with “Docker for Desktop” > 💡 Recommended if you're planning to develop the application. 1. Install tools to run a Kubernetes cluster locally: - kubectl (can be installed via `gcloud components install kubectl`) - Docker for Desktop (Mac/Windows): It provides Kubernetes support as [noted here](https://docs.docker.com/docker-for-mac/kubernetes/). - [skaffold](https://github.com/GoogleContainerTools/skaffold/#installation) (ensure version ≥v0.20) 1. Launch “Docker for Desktop”. Go to Preferences: - choose “Enable Kubernetes”, - set CPUs to at least 3, and Memory to at least 6.0 GiB 3. Run `kubectl get nodes` to verify you're connected to “Kubernetes on Docker”. 4. Run `skaffold run` (first time will be slow, it can take ~20-30 minutes). This will build and deploy the application. If you need to rebuild the images automatically as you refactor the code, run `skaffold dev` command. 5. Run `kubectl get pods` to verify the Pods are ready and running. The application frontend should be available at http://localhost:80 on your machine. ### Option 2: Running on Google Kubernetes Engine (GKE) > 💡 Recommended for demos and making it available publicly. 1. Install tools specified in the previous section (Docker, kubectl, skaffold) 1. Create a Google Kubernetes Engine cluster and make sure `kubectl` is pointing to the cluster. gcloud services enable container.googleapis.com gcloud container clusters create demo --enable-autoupgrade \ --enable-autoscaling --min-nodes=3 --max-nodes=10 --num-nodes=5 --zone=us-central1-a kubectl get nodes 1. Enable Google Container Registry (GCR) on your GCP project and configure the `docker` CLI to authenticate to GCR: gcloud services enable containerregistry.googleapis.com gcloud auth configure-docker -q 1. In the root of this repository, run `skaffold run --default-repo=gcr.io/[PROJECT_ID]`, where [PROJECT_ID] is your GCP project ID. This command: - builds the container images - pushes them to GCR - applies the `./kubernetes-manifests` deploying the application to Kubernetes. **Troubleshooting:** If you get "No space left on device" error on Google Cloud Shell, you can build the images on Google Cloud Build: [Enable the Cloud Build API](https://console.cloud.google.com/flows/enableapi?apiid=cloudbuild.googleapis.com), then run `skaffold run -p gcb --default-repo=gcr.io/[PROJECT_ID]` instead. 1. Find the IP address of your application, then visit the application on your browser to confirm installation. kubectl get service frontend-external **Troubleshooting:** A Kubernetes bug (will be fixed in 1.12) combined with a Skaffold [bug](https://github.com/GoogleContainerTools/skaffold/issues/887) causes load balancer to not to work even after getting an IP address. If you are seeing this, run `kubectl get service frontend-external -o=yaml | kubectl apply -f-` to trigger load balancer reconfiguration. ### (Optional) Deploying on a Istio-installed GKE cluster > **Note:** you followed GKE deployment steps above, run `skaffold delete` first > to delete what's deployed. 1. Create a GKE cluster (described above). 2. Use [Istio on GKE add-on](https://cloud.google.com/istio/docs/istio-on-gke/installing) to install Istio to your existing GKE cluster. gcloud beta container clusters update demo \ --zone=us-central1-a \ --update-addons=Istio=ENABLED \ --istio-config=auth=MTLS_PERMISSIVE > NOTE: If you need to enable `MTLS_STRICT` mode, you will need to update > several manifest files: > > - `kubernetes-manifests/frontend.yaml`: delete "livenessProbe" and > "readinessProbe" fields. > - `kubernetes-manifests/loadgenerator.yaml`: delete "initContainers" field. 3. (Optional) Enable Stackdriver Tracing/Logging with Istio Stackdriver Adapter by [following this guide](https://cloud.google.com/istio/docs/istio-on-gke/installing#enabling_tracing_and_logging). 4. Install the automatic sidecar injection (annotate the `default` namespace with the label): kubectl label namespace default istio-injection=enabled 5. Apply the manifests in [`./istio-manifests`](./istio-manifests) directory. kubectl apply -f ./istio-manifests This is required only once. 6. Deploy the application with `skaffold run --default-repo=gcr.io/[PROJECT_ID]`. 7. Run `kubectl get pods` to see pods are in a healthy and ready state. 8. Find the IP address of your istio gateway Ingress or Service, and visit the application. INGRESS_HOST="$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].ip}')" echo "$INGRESS_HOST" curl -v "http://$INGRESS_HOST" ## Conferences featuring Hipster Shop - [Google Cloud Next'18 London – Keynote](https://youtu.be/nIq2pkNcfEI?t=3071) showing Stackdriver Incident Response Management - Google Cloud Next'18 SF - [Day 1 Keynote](https://youtu.be/vJ9OaAqfxo4?t=2416) showing GKE On-Prem - [Day 3 – Keynote](https://youtu.be/JQPOPV_VH5w?t=815) showing Stackdriver APM (Tracing, Code Search, Profiler, Google Cloud Build) - [Introduction to Service Management with Istio](https://www.youtube.com/watch?v=wCJrdKdD6UM&feature=youtu.be&t=586) --- This is not an official Google project.