_cloud-controller.html.md.erb

1. Click **Cloud Controller**.

	<%= image_tag("config-cc.png") %>

1. Enter your **Cloud Controller DB Encryption Key** if all of the following are true:
  * You deployed Pivotal Application Service (PAS) previously.
  * You then stopped PAS or it crashed.
  * You are re-deploying PAS with a backup of your Cloud Controller database.
  <br><br>
  See [Backing Up Pivotal Cloud Foundry](./backup-restore/index.html) for more information.

1. CF API Rate Limiting prevents API consumers from overwhelming the platform API servers. Limits are imposed on a per-user or per-client basis and reset on an hourly interval. 
	<br><br>
	To disable CF API Rate Limiting, select **Disable** under **Enable CF API Rate Limiting**. To enable CF API Rate Limiting, perform the following steps:
	
	1. Under **Enable CF API Rate Limiting**, select **Enable**.
	1. For **General Limit**, enter the number of requests a user or client is allowed to make over an hour interval for all endpoints that do not have a custom limit. The default value is `2000`.
	1. For **Unauthenticated Limit**, enter the number of requests an unauthenticated client is allowed to make over an hour interval. The default value is `100`.

1. (Optional) Enter in seconds your **Database Connection Validation Timeout**. By
default, the setting is `3600` seconds or 60 minutes. You can enter `-1` to cause Cloud
Controller to make an additional query to the database whenever connections are checked out from
the pool. Choosing `-1` has performance implications.

1. (Optional) Enter in seconds your **Database Read Timeout**. By default, the setting is `3600`
seconds or 60 minutes.

1. (Optional) Select your default Linux stack. Apps pushed to Linux cells run on this
stack unless you specify otherwise with the `cf push -s STACKNAME` option. Existing apps
continue to use their current stack when you change the default stack. For more
information, see [Restaging Applications on a New
Stack](../devguide/deploy-apps/stacks.html#cli-commands). For a brief description of each
option, see the following:
	* **Platform default (currently cflinuxfs3)**: Use the default stack for the current PCF version and migrate on upgrade if there is a new default stack. 
	* **cflinuxfs3**: Use `cflinuxfs3` and do not change on upgrade. 
	* **cflinuxfs2**: Use `cflinuxfs2` and do not change on upgrade. 


1. Click **Save**.