Follow the steps given below to update your Deployment:

1. Let's update the nginx Pods to use the nginx:1.16.1 image instead of the nginx:1.14.2 image

kubectl set image deployment.v1.apps/ubuntu-deployment ubuntu=ubuntu:16.04

Also, change the echo statement in the command

2. See the rollout status, run: kubectl rollout status deployment/ubuntu-deployment

Run kubectl get rs to see that the Deployment updated the Pods by creating a new ReplicaSet and scaling it

up to 3 replicas, as well as scaling down the old ReplicaSet to 0 replicas