In this tutorial, you’ll build an address book API service with Node.js. The API exposes a simple RESTful API interface to create, delete, and find people in the database. You’ll use Git to push the code to GitHub. Then you’ll use Semaphore to test the application, build a Docker image, and deploy it to a DigitalOcean Kubernetes cluster. For the database, you’ll create a PostgreSQL cluster using DigitalOcean Managed Databases.