Embodiments of the invention are disclosed for establishing single identity/single-sign on (SSO) on a cloud computing platform. In an embodiment, a user is validated to the cloud computing platform, and identifies a domain. After establishing that the user has control of the domain, the cloud computing platform configures a directory service for the domain. The user may then use the directory service on the cloud computing platform to log in to his or her computer, as well as software services hosted on the cloud computing platform.