I'm deploying openstack- stein version on ubuntu pro 18.04 LTS.

I come across these lines when configuring keystone - identity service, as of this [article](https://docs.openstack.org/keystone/stein/install/keystone-install-ubuntu.html).

Would anybody please explain how to set this following configuration:

```
$ export OS_USERNAME=admin
$ export OS_PASSWORD=ADMIN_PASS
$ export OS_PROJECT_NAME=admin
$ export OS_USER_DOMAIN_NAME=Default
$ export OS_PROJECT_DOMAIN_NAME=Default
$ export OS_AUTH_URL=http://controller:5000/v3
$ export OS_IDENTITY_API_VERSION=3

```

If I'm already in root mode, is there any need to these env variables ?

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