To securely connect Nirmata to OpenStack in your Private Cloud or Data Center, setup a private-cloud-setup.
Then, provide the vCenter SDK URL (http://<server-address>/sdk) and credentials.
In Nirmata, select Cloud Providers from the sidebar menu. Select +Add Cloud Provider.

Enter the Cloud Provider information. Select VMware vSphere as the Type and select a Private Cloud. Click Next.

On the Settings tab, enter the Endpoint URL and Username and Password. Click Next.

Nirmata automatically validates account access. Once account access is validated, setup a VMWare vSphere Host Group.