I try to add a basic authentication to my kubernetes cluster by changing the file. /etc/kubernetes/manifest/kubernetes-apiserver.yaml There i add 3 flags
But when i add those lines and i restart my system. My kubernetes freezes and won't start. Is this the right way to add flags to an already running kubernetes cluster ? Is this the right way to add basic authentication to kubernetes dashboard ?
I used this tutorial for the basic authentication: https://github.com/kubernetes/dashboard/wiki/Access-control#basic
Conceptually you doing everything right, but the problem is that for Modern Kubernetes version, at least for 1.9, authentication-mode is not a valid CLI flag for API server. All available flags you can check in documentation. It is a bit outdated documentation in the repo. Actually, basic authentification will be enabled when you provided basic-auth-file option.
So, just remove authentication-mode flag and use only basic-auth-file and authorization-mode. If should help.
For enable a user/password authorization, based on documentation of dashboard, you need to add authentication-mode CLI arg to a Dashboard.