incorrect REVISION sequence number under section "Updating a Deployment"

[usmangt]

When going through the example of Updating a Deployment

Just before the "Undo a change" subheading the example have the correct output:

controlplane $ kubectl rollout history deployment nginx
deployment.apps/nginx 
REVISION  CHANGE-CAUSE
1         <none>
2         kubectl set image deployment nginx nginx=nginx:1.17 --record=true
3         kubectl edit deployments.apps nginx --record=true

Till here the REVISION sequence number is correct.

After that If we follow the instructions for the subheading "Undo a change"

The REVISION number is now changed:

controlplane $ kubectl rollout history deployment nginx
deployment.apps/nginx 
REVISION  CHANGE-CAUSE
1         
3         kubectl edit deployments.apps nginx --record=true
4         kubectl set image deployment nginx nginx=nginx:1.17 --record=true

This makes it very unclear and not possible to follow the example further.

The correct output should be:

controlplane ~ ➜  kubectl rollout history deployment 
deployment.apps/nginx 
REVISION  CHANGE-CAUSE
1         <none>
2         kubectl set image deployment nginx nginx=nginx:1.17 --record=true
3         kubectl edit deployments.apps nginx --record=true

Where, REVISION#3 is the current revision where we have deployed the nginx:latest version

controlplane ~ ➜  kubectl describe deployments. nginx | grep -i image:
    Image:        nginx:latest

To roll back to the previous version (nginx:1.17 which is REVISION#2) we use the rollout undo command:

controlplane ~ ➜  kubectl rollout undo deployment nginx --to-revision=2
deployment.apps/nginx rolled back

Now, checking the rollout history:

controlplane ~ ➜  kubectl rollout history deployment nginx
deployment.apps/nginx 
REVISION  CHANGE-CAUSE
1         <none>
3         kubectl edit deployments.apps nginx --record=true
4         kubectl set image deployment nginx nginx=nginx:1.17 --record=true

Verifying the currently deployment nginx version

controlplane ~ ➜  kubectl describe deployments.apps/nginx | grep -i image:
    Image:        nginx:1.17

Please fix it.

Feel free to let me know if you need any help!!