:original_name: mrs_01_0201.html

.. _mrs_01_0201:

Object Management
=================

MRS contains different types of basic objects. :ref:`Table 1 <mrs_01_0201__table23400575171145>` describes these objects.

.. _mrs_01_0201__table23400575171145:

.. table:: **Table 1** MRS basic object overview

   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Object           | Description                                                                   | Example                                                                                                          |
   +==================+===============================================================================+==================================================================================================================+
   | Service          | Function set that can complete specific business.                             | KrbServer service and LdapServer service                                                                         |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Service instance | Specific instance of a service, usually called service.                       | KrbServer service                                                                                                |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Service role     | Function entity that forms a complete service, usually called role.           | KrbServer is composed of the KerberosAdmin role and KerberosServer role.                                         |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Role instance    | Specific instance of a service role running on a host.                        | KerberosAdmin that is running on Host2 and KerberosServer that is running on Host3                               |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Host             | An ECS running Linux OS.                                                      | Host1 to Host5                                                                                                   |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Rack             | Physical entity that contains multiple hosts connecting to the same switch.   | Rack1 contains Host1 to Host5.                                                                                   |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
   | Cluster          | Logical entity that consists of multiple hosts and provides various services. | Cluster1 cluster consists of five hosts (Host1 to Host5) and provides services such as KrbServer and LdapServer. |
   +------------------+-------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+