Rolling Updates And Rolling Back Deployments in Kubernetes

Question : There is a production deployment planned for next week. The Nautilus DevOps team wants to test the deployment update and rollback on Dev environment first so that they can identify the risks in advance. Below you can find more details about the plan they want to execute.

Create a namespace xfusion. Create a deployment called httpd-deploy under this new namespace, It should have one container called httpd, use httpd:2.4.25 image and 6 replicas. The deployment should use RollingUpdate strategy with maxSurge=1, and maxUnavailable=2.

Next upgrade the deployment to version httpd:2.4.43 using a rolling update.

Finally, once all pods are updated undo the update and roll back to the previous/original version.

 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  kubectl  utility configure and working from jump server, rub below commands

    kubectl get namespace 

2.  Create namespace as per the task request.

    kubectl create namespace  xfusion

3.  Create yaml  file with all the parameters , you can copy form gitlab

    https://gitlab.com/nb-tech-support/devops.git

    ( Refer Below Video for more clarity )

apiVersion: apps/v1

kind: Deployment

metadata:

  name: httpd-deploy

  namespace: xfusion

spec:

  replicas: 6

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxSurge: 1

      maxUnavailable: 2

  selector:

    matchLabels:

      app: httpd

  template:

    metadata:

      labels:

        app: httpd

    spec:

      containers:

        - name: httpd

          image: httpd:2.4.25

4.  Run below command to create pod

    kubectl apply  -f /tmp/httpd.yaml --namespace=xfusion

5.  Wait for  pods to get running status

        kubectl get pods -n xfusion

        kubectl get deployment -n xfusion

        

6.  Perform  rolling update by running below command

 kubectl set image deployment httpd-deploy  httpd=httpd:2.4.43 --namespace xfusion --record=true

7.  Rollback the deployment as per task  

kubectl rollout undo deployment httpd-deploy  -n xfusion 

8.  validate roll out status by command

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

Happy Learning!!!!

I have made a  tutorial video on this , please go through and share your comments. Like and share the knowledge