> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://krystal-dev.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Support for memcached and redis

#### Memcached

Whilst we have the options available within [PHP Extension selector](/cpanel/changing-your-php-version-modules-setting-and-functions) for Memcached on our cloud, business and reseller platforms - we don't actually run Memcached servers. This is available for you to connect to an external Memcached server if you wish to.

You are welcome to run your own Memcached server - and if you do please log a support ticket to let us know the external IP address so we can allow access to it through our firewalls.

![](https://storage.crisp.chat/users/helpdesk/website/7bb798bfe0aca800/ffa1e5c2-be7e-411e-90eb-c52539_cy3r5l.jpeg)

#### Redis

Redis is only supported on our **Premium PCI-DSS compliant** hosting packages **(Sapphire, Diamond & Tanzanite).**

We have a separate guide that covers [enabling Redis on your Premium PCI-DSS compliant hosting account (Link opens in a new tab).](https://help.krystal.uk/cpanel-advanced-topics/how-do-i-enable-redis-on-my-pci-compliant-hosting-account)

* * *

* * *