Currently we do not have a prepackaged .deb file for redis. We are always looking on how to improve our repos and we will look into adding redis for future updates to PHP. Until then, the easiest way to get up and running with redis would be with PECL and PEAR.
We have a wiki on this here for Enterprise but should work the same for OLS:
https://www.litespeedtech.com/suppo...cl-extension#install_the_pear_package_manager
Just replace 55 and imagick with the version and pecl package you want to install. You might need to install the following as well for the module to be built: apt-get install build-essential autoconf