OpenShift cartridges provide the necessary command and control for the functionality of software that is running users' applications.
OpenShift cartridges provide the necessary command and control for the functionality of software that is running users' applications. OpenShift currently has many language cartridges (JBoss EAP, JBoss EWS, PHP, Ruby, Rails, etc.) as well as many DB cartridges (Postgres, Mysql, Mongo, etc.).