I have a simple kubernetes deployment with 3 replicas of an nginx container.
The Kubernetes documentation here says:
Note: A Deployment’s rollout is triggered if and only if the Deployment’s pod template (that is, .spec.template) is changed, for example if the labels or container images of the template are updated. Other updates, such as scaling the Deployment, do not trigger a rollout.
However when I scale my deployment, it does trigger a rollout. What am I missing here?:
C:\Kubernetes>kubectl scale deployment myapp-deployment --replicas=20
deployment "myapp-deployment" scaled
C:\Kubernetes>kubectl rollout status deployment/myapp-deployment
Waiting for rollout to finish: 3 of 20 updated replicas are available...
Waiting for rollout to finish: 4 of 20 updated replicas are available...
Waiting for rollout to finish: 5 of 20 updated replicas are available...
Waiting for rollout to finish: 6 of 20 updated replicas are available...
Waiting for rollout to finish: 7 of 20 updated replicas are available...
Waiting for rollout to finish: 8 of 20 updated replicas are available...
Waiting for rollout to finish: 9 of 20 updated replicas are available...
Waiting for rollout to finish: 10 of 20 updated replicas are available...
Waiting for rollout to finish: 11 of 20 updated replicas are available...
Waiting for rollout to finish: 12 of 20 updated replicas are available...
Waiting for rollout to finish: 13 of 20 updated replicas are available...
Waiting for rollout to finish: 14 of 20 updated replicas are available...
Waiting for rollout to finish: 15 of 20 updated replicas are available...
Waiting for rollout to finish: 16 of 20 updated replicas are available...
Waiting for rollout to finish: 17 of 20 updated replicas are available...
Waiting for rollout to finish: 18 of 20 updated replicas are available...
Waiting for rollout to finish: 19 of 20 updated replicas are available...
deployment "myapp-deployment" successfully rolled out