RBAC Error in Kubernetes

Question

I have deployed kubernetes v1.8 in my workplace. I have created roles for admin and view access to namespaces 3months ago. In the initial phase RBAC is working as per the ac

Answer 1

Ensure the RBAC authorization mode is still being used (--authorization-mode=…,RBAC is part of the apiserver arguments)

If it is, then check for a clusterrolebinding that is granting the cluster-admin role to all authenticated users:

kubectl get clusterrolebindings -o yaml | grep -C 20 system:authenticated