It's interesting that the logs are stating that it is a keyusage error. Can 
you get the keyusage for your generated cert and the ca.crt you used to 
generate it? The command to do so is:

openssl x509 -in <certificate to check> -purpose -noout -text

Nathan



On Wednesday, September 27, 2017 at 6:39:54 AM UTC-6, Henning Sprang wrote:
>
> Hi,
>
> After setting up a small cluster I want to enable other users (and a 
> jenkins server runing outside the cluster) to access the Cluster and manage 
> deployments, preferredly with an own namespace for each application 
> consisting of multiple services.
>
> So taking the information from 
> https://docs.bitnami.com/kubernetes/how-to/configure-rbac-in-your-kubernetes-cluster/#use-case-1-create-user-with-limited-namespace-access
>  
> and https://kubernetes.io/docs/tasks/tls/managing-tls-in-a-cluster/ I 
> figured out I have to create a user with this script: 
>
> https://gist.github.com/henning/2dda0b704426c66e78e355703a8dc177
>
> The problem is, when I try to run a command with this user/certificate, I 
> keep getting errors - on the command line:
>
> "error: You must be logged in to the server (the server has asked for the 
> client to provide credentials)"
>
> and even if this sounds like the client didn't even send a certificate, in 
> the log of the api server it says:
>
> "E0926 22:00:34.165133       5 authentication.go:58] Unable to 
> authenticate the request due to an error: x509: certificate specifies an 
> incompatible key usage"
>
> so actually it seems like the client sends a certificate, but it's somehow 
> not correct/sufficient.
>
> I searched the web to find out what to do about it and tried multiple 
> things(for example adding an Usage extension to the CSR, switched between 
> creating the key and certificate request with the openssl client as well as 
> cfssl, and with different versions of openssl on MacOS and Linux) - all 
> with the same result.
>
> So, my questions:
>
> * any further thing I can check for to solve this?
> * is the way I try to do it generally right, or would it be better/easier 
> to create a password file like described here? 
> https://kubernetes.io/docs/admin/authentication/#static-password-file
>
> Thanks in advance, and please let me know if there is any more information 
> needed that I might have forgotten.
>
> Henning
>

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