Object Management¶
MRS contains different types of basic objects. Table 1 describes these objects.
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. |