k8ManualScale2.sh

#!/bin/bash
#Manually scaling an application through yaml and cml

#Nginx deployment yaml created in previous script
kubectl create -f nginx-deployment.yaml

#Detailed status of nginx deployment
kubectl describe deployment nginx-deployment

#Scale deployment to 3 replicas
kubectl scale deployment/nginx-deployment --replicas=4

#Check status of nginx deployment after scaling
kubectl get deployments

#Check status of pods; including replicas
kubectl get pods

#Change set image in nginx deployment yaml
sed -i 's/replicas: 2/replicas: 4/g' /home/user/nginx-deployment.yaml

#Apply changes to nginx deployment yaml
kubectl apply -f nginx-deployment.yaml

#Check status of pods; including replicas
kubectl get pods