Open Stack

Hello ,every one:
Here is a question that confusing me for days.

I saw there is an authentication mechanism in keystone,that is responsible
for creating users ,projects,roles ,role-user relationship management
etc....and also,I found there is such a

mechanism in nova,which also can create users,projects,roles...things that
keystone do.

so ,what's the relationship between the two?..Can anyone please help me out
of here :) Thank you.
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