RPI Microk8s NodeJS Tutorial

Hello NodeJS

Docker Image generieren und in die lokale Registry pushen.

Installation über Helm Chart.

docker build -t localhost:32000/hello-node:1.0 .
docker push localhost:32000/hello-node:1.0 
microk8s helm3 install hello-node ./k8s --set defaultBackend.enabled=false,controller.defaultBackendService=hello-golang-service -n dev --create-namespace
microk8s helm3 uninstall hello-node -n dev

server.js

'use strict';

const express = require('express');
  
// Constants
const PORT = 8080;
const HOST = '0.0.0.0';
  
// App
const app = express();
app.get('/', (req, res) => {
  res.send('Hello World
'+JSON.stringify(process.env)+'
');
});
  
app.listen(PORT, HOST);
console.log(`Running on http://${HOST}:${PORT}`);
  

Dockerfile

FROM node:14
# Create app directory
WORKDIR /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./
    
RUN npm install
# If you are building your code for production
# RUN npm ci --only=production
    
# Bundle app source
COPY . .
    
EXPOSE 8080
CMD [ "node", "server.js" ]

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  name: hello-node-ingress
spec:
  tls:
  - hosts:
      - kimo2007.dnshome.de
    secretName: letsencrypt-tls
  defaultBackend:
    service:
      name: custom-default-backend1
      port:
        number: 80
  rules:
    - host: kimo2007.dnshome.de
      http:
        paths:
          - path: /hello-node(/|$)(.*)
            pathType: Prefix
            backend:
              service:
                name: hello-node-service
                port: 
                  number: 80

Deployment & Service (deployment.yaml)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-node
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-node
  template:
    metadata:
      labels:
        app: hello-node
    spec:
      containers:
        - name: app
          image: localhost:32000/hello-node:1.0
          ports:
            - containerPort: 8080
          env:
            - name: MONGO_URL
              value: mongodb://mongo:27017/dev
          imagePullPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: hello-node-service
  name: hello-node-service
spec:
  externalTrafficPolicy: Cluster
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: hello-node
  type: NodePort