An identity source is nothing but a repository of users and groups. These can be the local operating system users, active directory, or open LDAP and VMDir sources.
Here, VMDir is short for VM Directory which is SSO's LDAP-based internal directory that stores identity sources, SSO users, and policies. It is the source of truth for the vsphere.local domain.
Read the Upgrading the Single Sign-On (SSO) component recipe in Chapter 1, Upgrading to vSphere 5.5, for more information.
In this section, we will learn how to add identity sources to the SSO server.
The following procedure will guide you through the steps required to add Identity Sources to the SSO server: