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# Configure health monitoring

Before you begin

The server instance for which you configure self-health monitoring does not need to be running.

A server can monitor key aspects of its subsystems and report when a subsystem is not functioning properly. If the server is running under a Node Manager, the Node Manager can automatically restart a server with an unhealthy subsystem.

To enable health monitoring:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. Start the Administration Server.

   See Start and stop servers.

3. In the left pane of the Administration Console, expand the Servers folder and select a server.
4. On the Summary of Servers page, select the server instance for which you will request health monitoring.
5. On the Configuration > Health Monitoring tab, update as necessary:
   1. Auto Restart -- Specifies whether the Node Manager can automatically restart this server if it crashes or otherwise or goes down unexpectedly.
   2. Auto Kill If Failed -- Specifies whether the Node Manager should automatically kill this server if its health state is failed.
   3. Max Restarts Within Interval -- The number of times that the Node Manager can restart this server within the interval specified in Restart Delay Seconds.
   4. Health Check Interval -- The amount of time, in seconds, that defines the frequency that this server instance performs self-health monitoring.
   5. Restart Delay Seconds -- The amount of time, in seconds, the Node Manager should wait before restarting this server.

   For information about each attribute, refer to Configuration Options.

6. Click Save.
7. If the server is running, shut it down.
8. Use the Node Manager to start the server.

   Node Manager can perform automatic monitoring and shutdown only for servers that it starts.

9. To activate these changes, in the Change Center of the Administration Console, click Activate Changes.
   Not all changes take effect immediately—some require a restart (see Use the Change Center).