To become familiar with OpenShift, you need to understand the terminology associated with it. Let’s look at a few important terms associated with OpenShift.
Gears: The server containers along with their associated resources are called gears. They enable you to run your applications. There are three types of gears, as listed below: • Small gears, which have 512MB of RAM • Medium gears have 1GB of RAM • Large gears have 2GB of RAM The disk space provided with all these gears is 1GB in the default mode.
Cartridges: To make the gears usable for specific purposes, OpenShift requires you to add the components. These pluggable entities are known as cartridges. Each gear can have a number of cartridges. At the same time, a single cartridge can run on more than one gear. Cartridges are of two types as shown in Figure 3.