Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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### Creating a Health Checker

To create the health checker, use the `asadmin` `create-http-health-checke` r command. Specify the following parameters:

Table 4–2 Health Checker Parameters

Parameter | Description | Default
--- | --- | ---
url | Specifies the listener’s URL that the load balancer checks to determine its state of health. | “/”
interval | Specifies the interval in seconds at which health checks of instances occur. Specifying 0 disables the health checker. | 30 seconds
timeout | Specifies the timeout interval in seconds within which a response must be obtained for a listener to be considered healthy. | 10 seconds

If an application server instance is marked as unhealthy, the health checker polls the unhealthy instances to determine if the instance has become healthy. The health checker uses the specified URL to check all unhealthy application server instances to determine if they have returned to the healthy state.

If the health checker finds that an unhealthy instance has become healthy, that instance is added to the list of healthy instances.

For more information see the documentation for `create-http-health-checker` and `delete-http-health-checker`.

- Previous: Enabling Applications for Load Balancing
- Next: Additional Health Check Properties for Healthy Instances

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