Jenkins Shell script to deploy React / NodeJs application on Oracle remote staging server using Kubernetes

Jenkins.sh

#!/bin/bash

# Ensure BUILD_NUMBER is a string
BUILD_NUMBER="Build_$BUILD_NUMBER"

# Use SSH credentials to connect to a remote server
eval $(ssh-agent)
ssh-add $oracle_Instance_Key_file

# SSH into Minikube machine and run the deployment commands
sshpass -P passphrase -f <(printf '%s\n' $oracle_Instance_Passphrase) ssh -o "StrictHostKeyChecking no" -i $oracle_Instance_Key_file $Oracle_Machine_Ubuntu_User_IP "
env BUILD_NUMBER="$BUILD_NUMBER"

echo "The BUILD_NUMBER is:"; echo $BUILD_NUMBER;
echo "OS is:"; uname -a

# Remove old config 
rm -f k8s-deployment.yaml

# Create Kubernetes deployment configuration file
cat <<EOL > k8s-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: staging-deploy
    build: $BUILD_NUMBER
  name: staging-deploy
  annotations:
    kubernetes.io/change-cause: "Reapply at $(date)"
spec:
  replicas: 2
  minReadySeconds: 30
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 2
  selector:
    matchLabels:
      app: staging-deploy
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: staging-deploy
        Build: $BUILD_NUMBER
    spec:
      containers:
      - image: node:10.15.3
        imagePullPolicy: Always
        name: node
        command: ["/bin/sh", "-c"]
        args:
        - |
          git clone https://github.com/GermaVinsmoke/bmi-calculator
          cd bmi-calculator
          # Fetch the latest changes from the remote repository
          git fetch
          # Reset the local repository to match the remote repository
          git reset --hard origin/master
          git fetch 
          npm install
          npm start
        ports:
        - containerPort: 3000
        env:
        - name: BUILD_NUMBER
          value: $BUILD_NUMBER
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30
---
apiVersion: v1
kind: Service
metadata:
  name: react-app-service
spec:
  selector:
    app: staging-deploy
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
      nodePort: 30080
  type: NodePort
EOL

# Delete the previous deployment 
#kubectl delete -f k8s-deployment.yaml

# Apply the Kubernetes deployment
kubectl apply -f k8s-deployment.yaml

# List Kubernetes resources to verify
kubectl get all"