Help Center > > User Guide> Managing Active Clusters> Managing a Component> Isolating a Host

Isolating a Host

Updated at: Apr 28, 2020 GMT+08:00

Scenario

If a host is found to be abnormal or faulty, affecting cluster performance or preventing services from being provided, users can temporarily exclude that host from the available nodes in the cluster. In this way, the client can access other available nodes. In scenarios where patches are to be installed in a cluster, users can also exclude a specified node from patch installation.

Users can isolate a host manually on MRS based on the actual service requirements or O&M plan. Only non-management nodes can be isolated.

Impact on the System

  • After a host is isolated, all role instances on the host will be stopped. You cannot start, stop, or configure the host or any instances on the host.
  • After a host is isolated, statistics of the monitoring status and indicator data of the host hardware and instances cannot be collected or displayed.

Prerequisites

IAM user synchronization has been completed. (On the Dashboard tab page of the cluster details page, click on the right side of IAM User Sync to synchronize IAM users.)

Figure 1 IAM User Sync

Procedure

  1. On the MRS cluster details page, click Nodes.

    For MRS 1.8.10 or earlier, follow instructions in Isolating a Host.

  2. Select the checkbox of the host to be isolated.
  3. Choose Node Operation > Isolate Host.
  4. In Isolate Host, click OK.

    When Operation succeeded is displayed, click Finish. The host is isolated successfully, and the value of Operating Status becomes Isolated.

    The isolation of a host can be canceled and the host can be added to the cluster again. For details, see Canceling Isolation of a Host.

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