This Blog introduces some of very basic concept in OpenStack.
Tenant: Tenant was
previously called Project in Nova. It is
the unit when user requires the resource from OpenStack. Or in another word, it
is more resource related. For tenant, we can specify the ‘quota’ such as the Number
of volumes,size of all volumes,Number of instances each tenant can own.
User: a user is an ID
with dedicate username, password, email info etc. it is the authentication object
for a service in openstack.
A user must belong to a tenant or multiple tenants. If no
tenant is assigned, OpenStack will use a tenant with the same ID as the user.
Role: role is the
combination of privileges. It is not compulsorily required in OpenStack but
very useful in management. Administrator can create role and assign it to user.
Service: A service provides one or more endpoints through
which users can access resources and perform operations. The service is
provided via REST API. Service can be thought as ‘type’ of endpoint.
End Point: A network-accessible address, usually described
by a URL, where a service may be accessed. It is the specific service
can be used by OpenStack User.
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