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NodeJS WebApp

  • Node 18 LTS
  • Image on ACR

Local "Build and run"

  • Go to work dir
cd examples/webapp1
  • Define ACR name
acrName=finallcloudacr.azurecr.io
  • Image build
docker build --tag $acrName/node-webapp .
  • Check result
docker images

Note: If you build the image on Apple Silicon processor, use the following flag: --platform linux/amd64 or --platform linux/arm/v7

  • Local run:
docker run -d -p 8080:3000 --name nodedemo $acrName/node-webapp:latest

Check: http://localhost:8080

Push image to ACR

  • Login to ACR
az acr login --name $acrName
  • Create real version tag
docker tag $acrName/node-webapp:latest $acrName/node-webapp:1.0.0
  • Upload images to ACR
docker push $acrName/node-webapp:latest
docker push $acrName/node-webapp:1.0.0

Create WebApp in K3s

Check deployment file: node-webapp.yaml

Important parameters:

  • Namespace: node-webapp
  • replicas: 2 (it could be 1 ot more)
  • Image: finallcloudacr.azurecr.io/node-webapp:latest
  • host: node-webapp.finall.cloud (it must be your FQDN for your Raspberry Pi 5. Ip address is not acceptable)

Create WebApp

kubectl apply -f node-webapp.yaml

Check result

  • Get all resources from related namespace
kubectl get all -n node-webapp
  • Get ingress info
kubectl get ingress -n node-webapp

Note: Ingress must have same address to Raspberry Pi 5.

Scale

# More Pods
kubectl -n node-webapp scale --replicas=5 deployment node-webapp-deployment
# Less pods
kubectl -n node-webapp scale --replicas=1 deployment node-webapp-deployment

Upgrade app if new version is available

# Delete all old pods
kubectl get pods -n node-webapp -o name  | grep node-webapp-deployment | xargs kubectl delete -n node-webapp --wait=false

Delete resource

  • Delete namespace
kubectl delete ns node-webapp --wait=false