Instance Management Overview

Overview

Log in to FusionInsight Manager, choose Cluster > Name of the desired cluster > Services > KrbServer > Instance. The displayed instance management page contains the function area and role instance list.

Functional Area

The function area allows you to perform maintenance operations on roles, such as adding roles and starting or stopping instances.

**Table 1** Instance management and maintenance
UI Portal	Description
Start Instance	Start a specified instance in the cluster. You can start a role instance in the Not Started, Stop Failed, or Startup Failed state to use the role instance.
More > Stop Instance	Stop a specified instance in the cluster. Stop role instances that will no longer be used or are abnormal.
More > Restart Instance	Restart a specified instance in the cluster. Restart an abnormal role instance to recover its functions.
More > Instance Rolling Restart	Restart a specified instance in the cluster without interrupting services. For details about the parameter settings, see Performing a Rolling Restart of a Cluster.
More > Decommission/Recommission	Recommission or decommission a specified instance in the cluster to change the service availability status of the service. For details, see Decommissioning and Recommissioning an Instance. NOTE: Only the role DataNode in HDFS, the role NodeManager in Yarn, the role RegionServe in HBase support the recommissioning and decommissioning functions.
Desired instance > More > Synchronize Configuration	If Configuration Status of a role instance is Expired, the role instance is not restarted after its configurations are modified. The new configuration is saved only on FusionInsight Manager. In this case, use this function to deliver the new configuration to the specified instance. NOTE: After synchronizing a role instance configuration, restart the role instance whose configuration has expired. The role instance is unavailable during restart. After the synchronization is complete, restart the instance for the configuration to take effect.
Desired instance > Instance Configurations	For details, see Managing Instance Configurations.

You can filter instances based on the role they belong to or their running status in this area.

Click Advanced Search to search for specific instances by specifying filter criteria, such as Host Name, Management IP Address, Business IP Address, or Instance Groups.

Role Instance List

The role instance list contains the instances of all roles in the cluster. The list displays the running status, configuration status, hosts, and related IP addresses of each instance.

**Table 2** Instance running status
Status	Description
Normal	Indicates that the instance is running properly.
Faulty	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.

You can click an instance name to go to the instance details page and view basic information about the instance and the monitoring indicator report of the instance.

Parent topic: Instance Management

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