Update an Existing Deployment in Kubernetes

Question : There is an application deployed on Kubernetes cluster. Recently the Nautilus application development team developed a new version of the application that needs to be deployed now. As per new updates some new changes need to be made in this existing setup. So update the deployment and service as per details mentioned below:

We already have a deployment named nginx-deployment and service named nginx-service. Some changes need to be made in this deployment and service, make sure not to delete the deployment and service.

1.) Change the service nodeport from 30008 to 32165

2.) Change replicas count from 1 to 5

3.) Add a command: ["sh","-c","while true; do apt update; apt install -y vim php ; sleep 3; done"]

4.) Change the image from nginx:1.19 to nginx:latest

Please Note :-  Perform the below commands based on your question  server,  user name & other details might differ . So please read task carefully before executing. All the Best 👍

Solution:  

1. At first  run below commands to check  the existing setup    

thor@jump_host /$ kubectl get deploy NAME               READY   UP-TO-DATE   AVAILABLE   AGE nginx-deployment   1/1     1            1           14s thor@jump_host /$ thor@jump_host /$ kubectl get service NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP        86m nginx-service   NodePort    10.96.131.156   <none>        80:30008/TCP   2m20s thor@jump_host /$ thor@jump_host /$ kubectl get pods NAME                                READY   STATUS    RESTARTS   AGE nginx-deployment-57bf6d6978-wrmf4   1/1     Running   0          2m33s thor@jump_host /$

2. Edit the services as per the task and change the port no ( refer below video)     

thor@jump_host /$ kubectl edit service nginx-service service/nginx-service edited thor@jump_host /$ thor@jump_host /$ kubectl get service NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP        89m nginx-service   NodePort    10.96.131.156   <none>        80:32165/TCP   5m thor@jump_host /$

3. Edit the deployment and do the changes as per the task  ( refer below video)

    

thor@jump_host /$ kubectl edit deploy nginx-deployment deployment.apps/nginx-deployment edited thor@jump_host /$ thor@jump_host /$ kubectl get deploy NAME               READY   UP-TO-DATE   AVAILABLE   AGE nginx-deployment   4/5     4            4           13m thor@jump_host /$ thor@jump_host /$ kubectl get pods NAME                                READY   STATUS        RESTARTS   AGE nginx-deployment-57bf6d6978-42rfc   0/1     Terminating   0          13s nginx-deployment-57bf6d6978-dhwzm   0/1     Terminating   0          13s nginx-deployment-57bf6d6978-wrmf4   0/1     Terminating   0          13m nginx-deployment-6fc57985b9-bjwxj   1/1     Running       0          13s nginx-deployment-6fc57985b9-lx7cb   1/1     Running       0          13s nginx-deployment-6fc57985b9-qvnbj   1/1     Running       0          13s nginx-deployment-6fc57985b9-s4524   1/1     Running       0          6s nginx-deployment-6fc57985b9-vpdnw   1/1     Running       0          7s thor@jump_host /$

    

4.  Wait for  deployment & pods to get ready & running status

    

thor@jump_host /$ kubectl get deploy NAME               READY   UP-TO-DATE   AVAILABLE   AGE nginx-deployment   5/5     5            5           14m thor@jump_host /$ kubectl get pods NAME                                READY   STATUS    RESTARTS   AGE nginx-deployment-6fc57985b9-bjwxj   1/1     Running   0          118s nginx-deployment-6fc57985b9-lx7cb   1/1     Running   0          118s nginx-deployment-6fc57985b9-qvnbj   1/1     Running   0          118s nginx-deployment-6fc57985b9-s4524   1/1     Running   0          111s nginx-deployment-6fc57985b9-vpdnw   1/1     Running   0          112s thor@jump_host /$

5.  Click on Finish & Confirm to complete the task successful

Happy Learning!!!!

Apart from this if you need more clarity,  I have made a  tutorial video on this , please go through and share your comments. Like and share the knowledge