Configuring Parameters

Modifying Parameter Configurations

1. Log in to the CSS management console.
2. Choose Clusters in the navigation pane. On the Clusters page, click the name of the target cluster. The cluster information page is displayed.
3. Click Parameter Configurations and click Edit to modify module parameters as required.

   Table 1 Module parameters

   Module Name	Parameter	Description
   Cross-domain Access	http.cors.allow-credentials	Whether to return the Access-Control-Allow-Credentials of the header during cross-domain access Value: true or false Default value: false
   	http.cors.allow-origin	Origin IP address allowed for cross-domain access, for example, 122.122.122.122:9200
   	http.cors.max-age	Cache duration of the browser. The cache is automatically cleared after the time range you specify. Unit: s Default value: 1,728,000
   	http.cors.allow-headers	Headers allowed for cross-domain access, including X-Requested-With, Content-Type, and Content-Length. Use commas (,) and spaces to separate headers.
   	http.cors.enabled	Whether to allow cross-domain access Value: true or false Default value: false
   	http.cors.allow-methods	Methods allowed for cross-domain access, including OPTIONS, HEAD, GET, POST, PUT, and DELETE. Use commas (,) and spaces to separate methods.
   Reindexing	reindex.remote.whitelist	Configured for migrating data from the current cluster to the target cluster through the reindex API. The example value is 122.122.122.122:9200.
   Custom Cache	indices.queries.cache.size	Cache size in the query phase Value range: 1 to 100 Unit: % Default value: 10%
   Queue Size in a Thread Pool	thread_pool.bulk.queue_size	Queue size in the bulk thread pool. The value is an integer. Default value: 200
   	thread_pool.write.queue_size	Queue size in the write thread pool. The value is an integer. Default value: 200
   	thread_pool.force_merge.size	Queue size in the force merge thread pool. The value is an integer. Default value: 1
   Customize	You can add parameters based on your needs.	Customized parameters NOTE: Enter multiple values in the format as [value1, value2, value3...]. Separate values by commas (,) and spaces. Colons (:) are not allowed.

4. After the modification is complete, click Submit.In the displayed Submit Configuration dialog box, select the box indicating "I understand that the modification will take effect after the cluster is restarted." and click Yes.

   If the Status is Succeeded in the parameter modification list, the modification has been saved. Up to 20 modification records can be displayed.

5. Return to the cluster list and choose More > Restart in the Operation column to restart the cluster and make the modification take effect.
   • You need to restart the cluster after modification, or Configuration unupdated will be displayed in the Task Status column on the Clusters page.
   • If you restart the cluster after the modification, and Task Status displays Configuration error, the parameter configuration file fails to be modified.