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At its core, as the diagram below shows, CloudStack provides the capability to map virtual resources to various physical resources.  Note that it is only the "capability" and not the actual "mapping".  This is  key to the design principles of CloudStack.  The system administrator provides, controls, and monitors the actual mapping.  CloudStack is only the tool.  Use it for good or for evil. It's all up to that guy in the middle there. Image Added

Every cloud operator have hardware they're comfortable with from their experiences in running data center operations.  Some, like XenServer, NetScaler, and, ahem, everything else Citrix makes, are universally loved but, more often than not, the preferences vary.  Handling various hardware have its difficulties:

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Plugin API is where you can affect the most changes.  The following is a picture of the CloudStack software architecture.  Plugin APIs are defined by the Adapters which exposes the functionality required by CloudStack to implement cloud operations.  The details of how to affect this change is more complicated and is explained in 201. Image Added

Getting to the Code!

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