Managing Components and Monitoring Hosts

You can manage the following status and metrics of all components (including role instances) and hosts on the MRS console:

Status information: includes operation, health, configuration, and role instance status.
Indicator information: includes key monitoring indicators for each component.

You can set the interval for automatically refreshing the page or click to refresh the page immediately.
Component management supports the following parameter values:
- Refresh every 30 seconds
- Refresh every 60 seconds
- Stop refreshing

Prerequisites

You have synchronized IAM users. (On the Dashboard page, click Synchronize on the right side of IAM User Sync to synchronize IAM users.)

Procedure

Manage components.

On the MRS cluster details page, click Components.

Table 1 describes the service operating status.

**Table 1** Service operating status
Status	Description
Started	The service is started.
Stopped	The service is stopped.
Failed to start	Failed to start the role instance.
Failed to stop	Failed to stop the service.
Unknown	Indicates initial service status after the background system restarts.

Table 2 describes the service health status.

**Table 2** Service health status
Status	Description
Good	Indicates that all role instances in the service are running properly.
Faulty	Indicates that the running status of at least one role instance is Faulty or the status of the service on which the current service depends is abnormal.
Unknown	Indicates that all role instances in the service are in the Unknown state.
Restoring	Indicates that the background system is restarting the service.
Partially Healthy	Indicates that the status of the service on which the service depends is abnormal, and APIs related to the abnormal service cannot be invoked by external systems.

Table 3 describes the service health status.

**Table 3** Service configuration status
Status	Description
Synchronized	The latest configuration takes effect.
Configuration expired	The latest configuration does not take effect after the parameter modification. Related services need to be restarted.
Configuration failed	The communication is incorrect or data cannot be read or written during the parameter configuration. Use Synchronize Configuration to rectify the fault.
Configuring	Parameters are being configured.
Unknown	Indicates that configuration status cannot be obtained.

Click a specified service in the list to view its status and metric information.
Customize and view monitoring graphs.
1. In the Charts area, click Customize to customize service monitoring metrics.
2. In Period area, select a time of period and click View to view the monitoring data within the time period.

Manage role instances.

On the MRS cluster details page, click Components. In the component list, click the specified service name.

Click Instances to view the role status.

The role instance list contains the Role, Host Name, Management IP Address, Service IP Address, Rack, Running Status, and Configuration Status of each instance.

Table 4 shows the running status of a role instance.

**Table 4** Role instance running status
Status	Description
Good	Indicates that the instance is running properly.
Bad	Indicates that the instance cannot run properly.
Decommissioned	Indicates that the instance is out of service.
Not started	Indicates that the instance is stopped.
Unknown	Indicates that the initial status of the instance cannot be detected.
Starting	Indicates that the instance is being started.
Stopping	Indicates that the instance is being stopped.
Restoring	Indicates that an exception may occur in the instance and the instance is being automatically rectified.
Decommissioning	Indicates that the instance is being decommissioned.
Recommissioning	Indicates that the instance is being recommissioned.
Failed to start	Indicates that the service fails to be started.
Failed to stop	Indicates that the service fails to be stopped.

Table 5 shows the configuration status of a role instance.

**Table 5** Role instance configuration status
Status	Description
Synchronized	The latest configuration takes effect.
Configuration expired	The latest configuration does not take effect after the parameter modification. Related services need to be restarted.
Configuration failed	The communication is incorrect or data cannot be read or written during the parameter configuration. Use Synchronize Configuration to rectify the fault.
Configuring	Parameters are being configured.
Unknown	Current configuration status cannot be obtained.

By default, the Role column is sorted in ascending order. You can click the sorting icon next to Role, Host Name, OM IP Address, Business IP Address, Rack, Running Status, or Configuration Status to change the sorting mode.

You can filter out all instances of the same role in the Role column.

You can set search criteria in the role search area by clicking Advanced Search, and click Search to view specified role information. You can click Reset to reset the search criteria. Fuzzy search is supported.

Click the target role instance to view its status and metric information.
Customize and view monitoring graphs.
1. In the Charts area, click Customize to customize service monitoring metrics.
2. In Period area, select a time of period and click View to view the monitoring data within the time period.

Manage hosts.

On the MRS cluster details page, click the Nodes tab and expand a node group to view the host status.

The host list of a group contains the Node Name/Resource ID, IP, Status, Specifications, Disks, and AZ.

Table 6 shows the host operating status.

**Table 6** Host operating status
Status	Description
Normal	The host and service roles on the host are running properly.
Isolated	The host is isolated, and the service roles on the host stop running.

Table 7 describes the host health status.

**Table 7** Host health status
Status	Description
Good	The host can properly send heartbeats.
Bad	The host fails to send heartbeats due to timeout.
Unknown	The host initial status is unknown during the operation of adding or deleting a host.