how to enable api flags in kubernetes

Question

The below screenshot shows the kubernetes document to enable API server flags, but no clear instructions were given on where to change these API server flags. I'm using kubernetes on digital ocean cloud. I can not use hpa. kubernetes version is:

Answer 1

The kube-apiserver usually runs as a static pod. This means it is managed directly by the kubelet on a specific node, without the API server observing it and therefore it cannot be updated using kubectl commands.

Most of the times you can find the kube-apiserver pod running in the kube-system namespace.

kubectl get pods -n kube-system

The kubelet loads its config and then starts watching the static pods manifests directory. The path where you are most likely to find the kube-apiserver.yaml definition is /etc/kubernetes/manifests on the K8s node. Here is a unit test for this action in the K8s source code.

Updating /etc/kubernetes/manifests/kube-apiserver.yaml will automatically redeploy the pod with the new config, including the flags you need.

Answer 2

This depends on how your api-server is running. If it's as a service on the master node, @kishorebjv may have your answer, but if the api-server runs as a pod in kubernetes you should only have to add the flags to the args for that deployment/daemonset.

Answer 3

I believe you need to get working HPA in your kubernetes cluster. I have written a step by step answer for that, how can you achieve it:

How to Enable KubeAPI server for HPA Autoscaling Metrics

Please have a look. Hope this helps

Answer 4

you can create a apiserver.conf file in master node & mount it in /etc/kubernetes/ directory of apiserver container. This will help you to customize your API server. here is the sample code for this.