This is modification of the original memcached cartridge provides Memcached on OpenShift, to install create your app and run:
rhc add-cartridge "https://raw.githubusercontent.com/YuriyPobezhymov/openshift-cartridge-memcached/master/metadata/manifest.yml" -a [APP]
It has some small changes to work with Red Hat OpenShift Online. The cartridge purpose to be used with PHP client memcache, that is installed when PHP application (I use PHP 5.4 cartridge for that) created with Red Hat OpenShift Online. Memcached system version is the most recent.
The memcached cartridge provides following environment variables:
OPENSHIFT_MEMCACHED_HOST The Memcached IP address
OPENSHIFT_MEMCACHED_PORT The Memcached port
OPENSHIFT_MEMCACHED_USERNAME Username (if auth enabled)
OPENSHIFT_MEMCACHED_PASSWORD Password (if auth enabled)
SASL support disabled.
To setup how much memory memcached is allowed to use by settings user env var MEMCACHED_CACHESIZE:
rhc set-env MEMCACHED_CACHESIZE=128 --app $OPENSHIFT_APP_NAME"
rhc app-restart --app $OPENSHIFT_APP_NAME"