Suspend and Resume Nodes

This article explains how to suspend and resume nodes in a cluster.

The suspended node state indicates that the node has been intentionally taken offline, for example for maintenance.

Prerequisites

There are no prerequisites for this procedure.

Procedure

The following examples use ConfD through the command-line tool confd_client, which is available on all database nodes. For more information, see ConfD.

Connect to COS

Connect to the cluster operating system (COS) using c4 connect -i PLAY_ID -s cos.

Example:
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./c4 connect -i c3275f84 -s cos

For more information about how to use c4 connect, see How to use c4.

Suspend a node

To suspend a node, use the ConfD command node_suspend with the node ID. For example, to suspend node 12 in the current deployment:

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confd_client node_suspend nid: 12

Resume a node

Starting up a node will automatically unsuspend it. You can also manually unsuspend a node using the ConfD job node_resume. For example:

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confd_client node_resume nid: 12