Classic zones provide a simple structure for delineating users and groups based on a criteria you choose, such as by region or department. They are most appropriate if you have a well‑defined and well‑managed UNIX namespace with very few users who require special handling because of multiple profiles or conflicting profile attributes.
Classic zones are simple to manage as long as you only need a few. For example, imagine you have three regional zones with no users in common that are managed independently by their own zone administrators with only one enterprise system administrator who must have a profile in each zone. In that scenario, classic zones provide a simple solution because only one user account, the enterprise system administrator, must have a profile in each zone.
However, classic zones are very limited in complex environments where users need profiles in multiple zones or where there are multiple independently-managed UNIX namespaces to migrate to Active Directory. That is because classic zones do not share data across zone boundaries. The data must be created and managed in each zone independently. By contrast, hierarchical zones support inheritance, enabling you to create parent and child zones that share information as needed. Because classic zones do not support inheritance, you cannot use variables to define profile attributes or any other hierarchical zone features.
For most organizations, classic zones are primarily used to enable a new zone that works with pre-5.0 versions of the Centrify agent. If you have an older version of Centrify software installed and already have some zones deployed in your environment, you can continue to use those zones as-is. After upgrading, you then have the option to create any new zones as classic zones to operate within the legacy zone environment or as hierarchical zones.
Note: If you already have zones deployed, you can convert them to hierarchical zones after you deploy the new version of Centrify software, if you choose to do so. However, there’s no requirement for you to convert existing zones to hierarchical zones.