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MRS-operation-guide-lts/umn/source/managing_clusters/component_management/object_management.rst
proposalbot ac0532e380 Changes to mrs_umn from docs/doc-exports#462 (MRS UMN 2.0.38.SP20 version 
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Object Management

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

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.