Deploy-nodejs-mongodb-app-on-k8s

Deploying nodejs express backend application with MongoDB database on a kubernetes cluster.

Prerequisite

kubernetes cluster runnig

• In my case I used kubeadm to install kubernetes cluster in three ubuntu aws EC2

Creating a cluster with kubeadm

Steps

• Create persistent volume and persistent volume claim to persist Mongodb data

kubectl apply -f persistent-volume.yaml
kubectl apply -f mongodb-persistent-volume-claim.yaml

• Create configMap and secret for MongoDB metadat and Credentials

kubectl apply -f config.yaml

• Create MongoDB Deployment and service

kubectl apply -f mongodb.yaml

• Create Deployment for nodejs backend app

kubectl apply -f express-nodejs.yaml

• Create service for nodejs backend app

kubectl apply -f node-app-svc.yaml

• install Nginx Ingress Controller in Kubernetes by using helm to allow me apply ingress in cluster

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update
helm install ingress-nginx  ingress-nginx/ingress-nginx

• Create external service (LoadBalancer)

• Create Ingress to make app accessible from outside cluster and connect it with loadBalancer

  kubectl apply -f ingress-class.yml
  kubectl apply -f express-node-app-ingress.yaml

• Use the LoadBalancer dns name to access the service or hostname