Clouds define a set of public or private resources that can be used for storing files or executing n3phele commands. Access to clouds is predicated by user accounts that define the user's access identifer and secret used to authenticate with the cloud. 
The clouds supported by n3phele are listed in figure 1.
The URIs are used in the command execution profile definitions to indicate the cloud associated with that execution profile.  
Figure 1. Supported clouds
 name URI & Parameter set
EC2 Amazon
Elastic Compute Service 

supported parameter set
Amazon Elastic Compute Service with instance reuse (experimental)

supported parameter set 

Argonne National Labs OpenStack cloud (experimental)

supported parameter set