> For the complete documentation index, see [llms.txt](https://docs.link11.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.link11.com/product-guides/secure-cdn/interface/instances.md).

# Instances

<figure><img src="/files/QGY8nWJSWY0VB9Rb8HPo" alt=""><figcaption></figcaption></figure>

## **Overview**

This page allows administration of the customer's CDN system. The various levels of the system are as follows, from general to granular:

<table><thead><tr><th width="93.24609375">Level</th><th width="145.55078125">Description</th><th width="320.23046875">Contains</th><th>Available settings</th></tr></thead><tbody><tr><td><strong>CDN</strong></td><td>Entire content delivery network</td><td>Instance(s)</td><td>(Available on other pages in WebGUI, e.g. Load Balancing)</td></tr><tr><td><strong>Instance</strong></td><td>A configuration set for a domain</td><td>Location(s)</td><td>Domain-related, TLS, IP ACLs, API</td></tr><tr><td><strong>Location</strong></td><td>Cache and other settings for destination URLs</td><td>Path/file definitions, in order of precedence:<br>— Specific<br>— Regex<br>— Root (the default settings when no other definition applies)<br></td><td>Request-related (ports, query processing, etc.), origin-related (timeouts, load balancing, etc.), cache configuration</td></tr></tbody></table>

## **CDN Instance List**

The main window displays shows the instances for which CDN was purchased. Expanding an entry displays all [locations](#locations) for that instance.

Each entry in the table contains the following:

* **Name**\
  The name given to the instance.
* **Domain**\
  The customer domain.
* **Backend CNAME**\
  The backend canonical name of the domain.
* **Status**\
  The status of the CDN service instance. This will always be “Active”, as “Inactive” instances are not displayed to customers.
* **Actions**
  * **Edit**: For editing an instance.
  * **Add Location**: For [adding](#id-securecdn-instances-location.1) a new location.&#x20;
  * **Change Priority**: Reorder the application priority of Regex Locations.
  * **Purge**: For [purging the cache](#purging-the-cache).

***

## **Add or Edit an Instance**

[This page](/product-guides/secure-cdn/interface/instances/editing-a-cdn-instance.md) provides configuration options for CDN instances.

***

## **Locations**

Locations define how CDN settings are applied to specific parts of your website. This includes custom behavior for cache control, origin routing, and more.

By default, all traffic is directed to the `/` or “root” location for a domain, which also acts as a fallback when no other location matches. Locations are used to specify which parts of a site (e.g., directories or subdomains) should be handled differently.

When an entry in the [CDN Instances table](#cdn-instance-list) is expanded, all the locations configured for it are shown. The information displayed is as follows:

* **Location**: The defined path or pattern.
* **Location Type**: The type of match used (Exact, Recursive, or Regex).
* **HTTP Origin**:**Port:** IP address and port for HTTP requests.
* **HTTPS Origin:Port:** IP address and port for HTTPS requests.

For each location, the following options are available:

* **Edit**: For [modifying the location settings](#id-securecdn-instances-location.1).
* **Delete**: Remove the location.&#x20;

{% hint style="info" %}
The Root location cannot be deleted.
{% endhint %}

***

### Add or Edit a Location <a href="#id-securecdn-instances-location.1" id="id-securecdn-instances-location.1"></a>

<figure><img src="/files/BDUII2SUbzSphuJdI4tq" alt=""><figcaption></figcaption></figure>

When adding or editing a location, there are three types of settings.

Each group of settings is displayed in a separate tab:

* [General Settings](/product-guides/secure-cdn/interface/instances/cdn-location-general-settings.md)
* [Caching Settings](/product-guides/secure-cdn/interface/instances/cdn-location-caching-settings.md)
* [Cache Key Settings](/product-guides/secure-cdn/interface/instances/cdn-location-cache-key.md)

***

## Purging the Cache&#x20;

This allows admins to remove all files for the specified URL(s) which are currently cached on the CDN nodes. This will force the CDN to retrieve updated versions of the pages or files it is responsible for serving.

When a "Purge" button is selected, the dialog below appears. The top pulldown control offers three options for specifying URLs:

* **Exact URL**
* **URL starts with**
* **Pattern matching (Perl compatible regex)**

When each option is selected, an example entry shows the syntax.

<figure><img src="/files/gs1CySIBTlrc2i2ZTGD8" alt=""><figcaption></figcaption></figure>