matheusinit / nodejs-server-kubernetes Goto Github PK

This is project was used to learn about Kubernetes. The API REST it self is not the focus, but the Kubernetes and its configuration.

Kubernetes is a tool for automating the deployment and management of containerized applications. With the self-healing nature of Kubernetes, it is possible to deploy and manage applications without any human intervention.

The focus of this project is to run multiple instances of the API REST in a Kubernetes cluster that communicates with a PostgreSQL database

The following tools are needed to run this project:

• Docker
• Docker Compose
• Minikube
• jq
• curl
• wrk

The following tools are used:

• NodeJS
• Typescript
• Docker
• Docker Compose
• Prisma
• PostgreSQL

In the project is using an API Rest with the image matheusinit/nodejs-k8s, in version 0.1. There are two routes:

• / - to get a hello world from Kubernetes Pod
• /users - to insert a dumby user data and return it the list of users

To run this application in your machine (development):

docker compose up -d 

(This is needed only once) - To apply database migrations:

docker-compose exec api-rest pnpm db:migrate

To check if application is running:

curl http://0.0.0.0:3000 | jq 

Start minikube to run Kubernetes on your machine:

minikube start

View documentation of Minikube to more information

To view Kubernetes metrics in Minikube:

minikube dashboard

To run load test in NodeJS API Rest cluster to increase the number the pods:

wrk -t4 -c300 -d60s http://{SERVICE_HOST}:{SERVICE_PORT}/users

Meaning:

• {SERVICE_HOST} - API REST with NodeJS service host
• {SERVICE_PORT} - API REST with NodeJS service port

To view service url with host and port use minikube service nodejs-api-rest --url