Access Kubernetes API with kubectl failed after enabling RBAC - kubernetes

Question

I'm trying to enable RBAC on my cluster and iadded those following line to the kube-apiserver.yml :
- --authorization-mode=RBAC
- --runtime-config=rbac.authorization.k8s.io/v1beta1
- --authorization-rbac-super-user=admin
and i did systemctl restart kubelet ;
the apiserver starts successfully but i'm not able to run kubectl command and i got this error :
kubectl get po
Error from server (Forbidden): pods is forbidden: User "kubectl" cannot list pods in the namespace "default"
where am I going wrong or i should create some roles to the kubectl user ? if so how that possible

Answer 1

Error from server (Forbidden): pods is forbidden: User "kubectl" cannot list pods in the namespace "default"
You are using user kubectl to access cluster by kubectl utility, but you set --authorization-rbac-super-user=admin, which means your super-user is admin.
To fix the issue, launch kube-apiserver with superuser "kubectl" instead of "admin."
Just update the value of the option: --authorization-rbac-super-user=kubectl.

Answer 2

Old question but for google searchers, you can use the insecure port:
If your API server runs with the insecure port enabled (--insecure-port), you can also make API calls via that port, which does not enforce authentication or authorization.
Source: https://kubernetes.io/docs/reference/access-authn-authz/rbac/#privilege-escalation-prevention-and-bootstrapping
So add --insecure-port=8080 to your kube-apiserver options and then restart it.
Then run:
kubectl create clusterrolebinding kubectl-cluster-admin-binding --clusterrole=cluster-admin --user=kubectl
Then turn the insecure-port off.