Overview

After creating a cluster, you can use the MRS console or MRS Manager to manage and maintain it, as well as view basic information.

The MRS console's cluster management page allows you to monitor and manage nodes, components, alarms, files, and jobs related to the cluster.
MRS Manager is the O&M management system of MRS and provides unified cluster management capabilities for services deployed in clusters.

For further information on the capabilities of the MRS console and Manager, refer to Table 1.

**Table 1** MRS console and Manager capability comparison
Operation	Console	Manager
Changing subnets, adding security group rules, controlling OBS permissions, managing agencies, and synchronizing IAM users	Yes	No
Adding node groups, scaling out, scaling in, and upgrading specifications	Yes	No
Isolating hosts, starting all roles, and stopping all roles	Yes	Yes
Downloading the client, starting services, stopping services, and perform rolling restart of services	Yes	Yes
Viewing the instance status of services, configuring parameters, and synchronizing configurations	Yes	Yes
Viewing cleared alarms and events	Yes	Yes
Viewing the alarm help	Yes	Yes
Setting thresholds for threshold alarms	No	Yes
Adding message subscription specifications	Yes	No
Managing files	Yes	No
Managing jobs	Yes	No
Managing tenants	Yes	Yes
Managing tags	Yes	No
Setting permissions (adding and deleting users, user groups, and roles)	No	Yes
Backing up component data and restoring data	No	Yes
Logging metadata operation audit	No	Yes
Monitoring resources	Yes	Yes

There are various fundamental objects in MRS, which are listed in Table 2.

**Table 2** MRS basic objects
Object	Description	Example
Component	Function set that can complete specific business.	KrbServer and LdapServer
Instance	Specific instance of a component, which can also be referred to as a component.	KrbServer
Role	Function entity that forms a complete component, 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.	Cluster names Cluster1 consists of five hosts (Host1 to Host5) and provides services such as KrbServer and LdapServer.