Kubernetes Hello World Node.js

a This project is intended to be used as a sample for deployment of kubernetes applications.

Basically this expose 3 apis:

• /hangar
• /ping
• /current-date
• /fibo/:n

The last one is good to test the capacity of the cluster by implement a fibonnaci with any number specified. Numbers great than 35 could crash your server :)

Start

Build the image

docker build byjg/k8s-hello-node

Run the Image

docker run -d -p 3000:3000 byjg/k8s-hello-node

Deploying in the Kubernetes cluster

First create the Pods and the autoscale

kubectl apply -f kubernetes/deployment.yml

Check if is OK:

kubectl get pods -l app=k8s-node -o yaml | grep podIP

Exposing the Api to the World:

kubectl apply -f kubernetes/service-external.yml

Checking:

kubectl get service

Run this to see the auto scaling working:

ab -n 500 -c 10 -s 600 http://<IP>/fibo/35

Exposing the Api inside the cluster:

kubectl apply -f kubernetes/service-external.yml

Checking:

kubectl run terminal --generator=run-pod/v1 --image=alpine:3.8 -i --tty