What is Kubernetes Deployment?

An object that keeps a chosen number of identical pods running and updates them safely.

In plain English

You describe the desired state, such as three copies of version 2 of an app. The Deployment creates the pods through a ReplicaSet, replaces any that fail, and rolls out a new version gradually so the app stays available. If the new version misbehaves you can roll back to the previous one.

Example

Changing the container image tag in a Deployment starts a rolling update: new pods start while old ones are removed a few at a time.

Easy to confuse with

• Pod: You rarely create bare pods. A Deployment manages them for you.

Where you will meet it

This idea belongs to the subject area of these practice tests. We do not publish or predict real exam questions.

• KCNA practice tests

Related terms

• Pod: The smallest unit you can deploy in Kubernetes, made of one or more containers that run together.
• Kubernetes Service: A stable network address and name that sends traffic to a changing group of pods.
• GitOps: Using a Git repository as the single source of truth for what should be running, with software that keeps the live system matching it.

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