Open Stack

Hi,
I am a little confuse about keystone roles, there are several role like
admin, Member, KeystoneAdmin, KeystoneServiceAdmin, sysadmin, netadmin, I
want to know does those name have special means, or just a name and I can
name my role with any name I like, if they have special means, why should I
create them manually?

can some one explain to me or give me some links?

Thanks

-- 

===========================
William Herry

WilliamHerryChina at Gmail.com
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