What is Kubernetes Service?

A stable network address and name that sends traffic to a changing group of pods.

In plain English

Because pods come and go, their addresses change. A Service picks its pods by label and gives clients one steady name and virtual IP, then spreads requests across the healthy pods behind it. The common types are ClusterIP (inside the cluster only), NodePort (opens a port on every node) and LoadBalancer (asks the cloud for an external load balancer).

Example

A front-end calls http://orders and the orders Service forwards the request to one of three order pods.

Easy to confuse with

• Pod: The Service is the stable front door. The pods are the workers behind it.

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 We do not publish or predict real exam questions.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
• KCSA practice tests

Related terms

• Pod: The smallest unit you can deploy in Kubernetes, made of one or more containers that run together.
• Kubernetes Deployment: An object that keeps a chosen number of identical pods running and updates them safely.
• High availability: Designing a system so it keeps working when a part of it fails.

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