/tetrate-todos

Sample Spring Boot Application

Primary LanguageJava

tetrate-todos

Tetrate Todos is a sample app that demonstrates a migration from utlizing Spring Cloud modules for common cloud-native patterns, such as client-side load balancing, circuit breaking, service discovery, ect., to utilizng a Service Mesh. You can view an accompanying conference talk here

Before Istio Service Mesh: alt text

After with Istio Service Mesh: alt text

Deploying

Prior to installing ensure you have a kubernetes cluster, kubectl and helm CLIs installed.

  • To build from source you need a image registry to push the application images. Set a REGISTRY variable and then execute the all-legacy make target to build the original application. This will build the application, create and push the appliation images to a registy, and deploy the application services to the todos-legacy namespace on the targeted cluster.
$ export REGISTRY=gcr.io/abz-env 
$ make all-legacy -e image-repo=$REGISTRY
  • You can obtain the external IP addresses for the application from the list of kubernetes services. The Eureka service registry is exposed via the todos-registry service on port 8761 and the appliction webui is exposed via the todos-service service on port 8080
$ kubectl get svc -n todos-legacy

NAME             TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
postgres         ClusterIP      10.3.255.220   <none>        5432/TCP         9s
redis            ClusterIP      10.3.246.223   <none>        6379/TCP         9s
todos-api        ClusterIP      10.3.249.9     <none>        8080/TCP         9s
todos-postgres   ClusterIP      10.3.244.246   <none>        8080/TCP         8s
todos-redis      ClusterIP      10.3.243.23    <none>        8080/TCP         8s
todos-registry   LoadBalancer   10.3.250.113   35.243.167.50     8761:32405/TCP   8s
todos-service    LoadBalancer   10.3.244.71    35.243.167.55     8080:30498/TCP   9s
todos-webui      ClusterIP      10.3.242.63    <none>        8080/TCP         8s
  • Prior to deploying the mesh-enabled version of the application you will need to deploy Istio to the cluster. The simplest way to do this is using Tetrate Istio Distribution. 2 simple commands will enable this:
$ curl -sL https://dl.getistio.io/public/raw/files/download.sh | bash
$ getistio istioctl install --set profile=demo
  • To build the service mesh enabled version of the application execute the all-mesh make target. This will build the application, create and push the appliation images to a registy, and deploy the application services along with Istio Policy to the todos namespace on the targeted cluster.
$ make all-mesh -e image-repo=$REGISTRY
  • The application will be exposed on port 80 using the istio ingress gateway. You can obtain the IP address of the gateway from kubernetes:
$ kubectl get svc -n istio-system -l app=istio-ingressgateway

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