A standalone KDC server that can integrate various identity back ends including:
MemoryIdentityBackend.
It is default Identity Backend, and no cofiguration is needed. This backend is for no permanent storage requirements.
JsonIdentityBackend.
It implemented by Gson which is used to convert Java Objects into their JSON representation and convert a JSON string to an equivalent Java object. A json file will be created in “backend.json.file”. This backend is for small, easy, development and test environment.
ZookeeperIdentityBackend.
Currently it uses an embedded Zookeeper. In follow up it will be enhanced to support standalone Zookeeper cluster for replication and reliability. Zookeeper backend would be a good choice for high reliability, high performance and high scalability requirement and scenarios.
LdapIdentityBackend.
The Ldap server can be standalone or embedded using ApacheDS server as the backend. It is used when there is exist ldap server.
MavibotBackend.
A backend based on Apache Mavibot(an MVCC BTree library).