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Kubernetes Calculator 🧮

The Calculator application takes advantage of a microservice architecture to provide an API that solves mathematical expressions. The available microservices are the addition, subtraction, multiplication and division.

Additionally, a CI/CD pipeline was built with the help of GitHub Actions in order to automate the integration of software changes quickly and reliably into a Kubernetes Cluster deployed to Azure Kubernetes Service (AKS).

CI/CD Pipeline

The CI/CD pipeline was divided into 3 stages:

  1. npm-test: unit test the latest code code changes using NPM and mocha. 
    $ npm run test
> mocha services/**/test/*.js

addition
    ✔ 2 + 2 should be 4 
division
    ✔ 4 / 2 should be 2 
multiplication
    ✔ 2 * 2 should be 4 
subtraction
    ✔ 1 - 1 should be 0
  2. push-to-docker-hub: build & push microservices images to Docker Hub using docker-compose.
  3. deploy-to-aks: deploy the latest version of the application to an AKS cluster using Azure CLI and kubectl.

Deployment configurations for Pods and Services can be found in the form of YAML files inside the pods directory.

Kubernetes Cluster services:

$ kubectl get services

Services:
NAME             TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
addition         ClusterIP      10.0.223.36    <none>        80/TCP           2s
calculator       LoadBalancer   10.0.164.42    20.23.34.81   80:31993/TCP     1s
division         ClusterIP      10.0.6.244     <none>        80/TCP           1s
kubernetes       ClusterIP      10.0.0.1       <none>        443/TCP          3m24s
multiplication   ClusterIP      10.0.104.174   <none>        80/TCP           1s
subtraction      ClusterIP      10.0.66.115    <none>        80/TCP           1s

Documentation