Online service access controls using scale out directory features

Embodiments provide application and/or resource access control features of an online computing environment, but are not so limited. In an embodiment, a computer-implemented method provides access control features for an online application environment based in part on the use of a number of directory service instances isolated from direct customer access and deployed in a defined datacenter architecture. In one embodiment, a computing environment uses web-based access control features and a number of directory service instances having organizational units and corresponding mappings to maintain a support infrastructure as part of providing features of online application services to customers. Other embodiments are included and available.