What is the effect of changing the image of a Deployment?

What is the effect of changing the image of a Deployment?

• A. It creates a new ReplicaSet
• B. It immediately updates all running Pods in place
• C. It deletes the current ReplicaSet
• D. It disables the Deployment until manual action

Answer: (A)

Changing the image in a Deployment triggers a rolling update. The Deployment reconciles the updated Pod template and creates a new ReplicaSet that embodies the updated image. It doesn’t modify existing pods in place. Instead, the new ReplicaSet starts creating pods with the updated image while the old ReplicaSet is gradually scaled down, so the total number of replicas stays at the desired count. This controlled rollout allows for progress tracking and potential rollback if issues arise. You can observe the process by checking the rollout status and listing the ReplicaSets to see the old and new sets.

Changing the image in a Deployment triggers a rolling update. The Deployment reconciles the updated Pod template and creates a new ReplicaSet that embodies the updated image. It doesn’t modify existing pods in place. Instead, the new ReplicaSet starts creating pods with the updated image while the old ReplicaSet is gradually scaled down, so the total number of replicas stays at the desired count. This controlled rollout allows for progress tracking and potential rollback if issues arise. You can observe the process by checking the rollout status and listing the ReplicaSets to see the old and new sets.