Refresh access to minio

The minio access from jupyterhub server is made through the environment variables, this can be checked by running the following command in the jupyterhub terminal:

    env | grep AWS

You should see the following output:

    AWS_ACCESS_KEY_ID=your_access_key
    AWS_SECRET_ACCESS_KEY=your_secret_key
    AWS_SESSION_TOKEN=your_token

These environment variables are generated by the jupyterhub server when the user logs in. If you don't see these variables, please contact the system administrator. Its also have an expiration time, so if you see an error message like access denied:

    ClientError: An error occurred (403) when calling the HeadObject operation: Forbidden

You can try to re-login to the jupyterhub server, and besure to stop the server before logout.