Microservices demo

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.

Running locally

1. Install:

   • kubectl (can be installed via gcloud components install kubectl)
   • Docker for Desktop (Mac/Windows): Download the Edge release; not the
     stable. Edge release provides Kubernetes support as noted
     here.
   • skaffold

2. Launch Docker for Desktop. Go to Preferences and choose “Enable Kubernetes”.

3. Run kubectl get nodes to verify you're connected to Kubernetes on Docker.

4. Run skaffold run (first time will be slow). 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.

Setup on GKE

1. Install tools specified in the previous section (Docker, kubectl, skaffold)

2. Create a Google Kubernetes Engine cluster and make sure kubectl is pointing
   to the cluster.

3. Enable Google Container Registry (GCR) on your GCP project:

   gcloud services enable containerregistry.googleapis.com
   

4. Configure docker to authenticate to GCR:

   gcloud auth configure-docker -q
   

5. Edit skaffold.yaml, prepend your GCR registry host (gcr.io/YOUR_PROJECT/)
   to all imageName: fields (or update the existing project name).

6. Edit the Deployment manifests at kubernetes-manifests directory and update
   the image fields to match the changes you made in the previous step.

7. Run skaffold run. This builds the container
   images, pushes them to GCR, and deploys the application to Kubernetes.

8. Find the IP address of your application:

   kubectl get service frontend-external
   

   then visit the application on your browser to confirm
   installation.

Istio Deployment

1. Create a GKE cluster.

2. Install Istio without mutual TLS enablement.

3. Install the automatic sidecar injection (annotate the default namespace
   with the label):

   kubectl label namespace default istio-injection=enabled
   

4. Deploy the application.

5. Apply the manifests in ./istio-manifests directory.

   kubectl apply -f ./istio-manifests