While going through the documentation of getting started with kubernetes on docker desktop, i came through this word called service level , can anyone help me understand what is service level?

ps: i am a beginner in docker and kubernetes

thanks in advance :)

CodePudding user response：

It is not entirely clear what "Service level" references in this case,

It says in your link:

Kubernetes makes sure containers are running to keep your app at the service level you requested in the YAML file

And a little further down:

And now remove that container:

Check back on the result app in your browser at http://localhost:5001 and you’ll see it’s still working. Kubernetes saw that the container had been removed and started a replacement straight away.^

Judging from the context they refer to that the kube-controller-manager in the Kubernetes control plane continuously watches the state of the cluster and compares it to the desired state. When it discovers a difference (for example when a pod was removed) it fixes it by adding a new pod to match the number of replicas defined in the deployment.

For example if the deployment was configured to run in N number of replicas and one is removed, N-1 replicas remain. The kube-controller-manager starts a new pod to achieve the desired state of N replicas.

In this case the service level would refer to the number of replicas running, but as mentioned, it is ambiguous...

CodePudding user response：

There are services in kubernetes which you can use to expose applications (containers) running on pods.

You may read through this blog to learn more https://medium.com/@naweed.rizvi/kubernetes-setup-local-cluster-with-docker-desktop-7ead3b17bf68

You can also Watch this tutorial https://www.youtube.com/watch?v=CX8AnwTW2Zs&t=272s