Deploy Node.js application using local kubernetes cluster

Objectives

• Create a kubernetes cluster using Minikube.
• Configure deployment YML file.
• Deploy application.

Create a kubernetes cluster using Minikube

Install Minikube

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
sudo install minikube-linux-amd64 /usr/local/bin/minikube

Install kubectl

• Download the latest release

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

• Validate the binary

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"

• Validate the kubectl binary against the checksum file

echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check

• Install kubectl

sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

• Test to ensure the version you installed is up-to-date

kubectl version --client

Start cluster

minikube start

Configure deployment YML file

Create file e.g deployment.yml
Note: node-demo:latest is the docker image name that we want to deploy

apiVersion: apps/v1
kind: Deployment
metadata:
  name: node-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: node-demo
  template:
    metadata:
      labels:
        app: node-demo
    spec:
      containers:
        - name: app
          image: node-demo:latest
          ports:
            - containerPort: 3000
          imagePullPolicy: IfNotPresent

Deploy application

If serving local docker image then need to load image inside Minikube

minikube image load node-demo

Apply resource definitions to Kubernetes

kubectl apply -f deployment.yml

Verify pod

kubectl get pods

This will create a deployment with one replica and a container named node-demo, which uses the node-demo Docker image.

✌️!