when you on the master and root user you are by default system:admin, afaik.
You will need to add a user and give them the cluster-admin privileges to work from remote or as normal user.
latest/admin_guide/manage_ authorization_policy.html# managing-role-bindings
oadm policy add-role-to-user cluster-admin your-user
Maybe you will need to do the same on minishift.
on Montag, 14. August 2017 at 10:55 was written:
Followed  to create a multi node setup with a single master and three nodes using the ansible installer. After the all nodes started successfully, tried to use the CLI tool against the Openshift cluster, similar to how I used it in the local minishift environment, to login as the default system admin (system:admin):
oc login -u system:admin
Then, I'm prompted for a password, which did not happen locally.
Checked the master configuration file master-config.yaml, and the section is similar to . AFAIU from the docs, the AllowAllPasswordIdentityProvid
er configuration will allow any non empty username and password to login to the system, but not relevant to the cluster administrator. Please correct if I'm wrong.https://docs.openshift.org/
Also went through the user management  and authorization documents  but I was unable to figure out how to configure/find the default admin credentials. Please do share your inputs on how to proceed from here.
latest/install_config/install/ advanced_install.html# configuring-host-port
latest/architecture/ additional_concepts/ authorization.html
- challenge: true
Thanks and Regards,