OpenStack provides various services to manage cloud infrastructure resources, including user management. Let’s analyze each option:
A. Cinder
Incorrect: Cinderis the OpenStack block storage service that provides persistent storage volumes for virtual machines. It is unrelated to managing users.
B. Keystone
Correct: Keystoneis the OpenStack identity service responsible for authentication, authorization, and user management. Theopenstack user listcommand interacts with Keystone to retrieve a list of users in the OpenStack environment.
C. Nova
Incorrect: Novais the OpenStack compute service that manages virtual machine instances. It does not handle user management.
D. Neutron
Incorrect: Neutronis the OpenStack networking service that manages virtual networks, routers, and IP addresses. It is unrelated to user management.
Why Keystone?
Identity Management:Keystone serves as the central identity provider for OpenStack, managing users, roles, and projects.
API Integration:Commands likeopenstack user listrely on Keystone's APIs to query and display user information.
JNCIA Cloud References:
The JNCIA-Cloud certification covers OpenStack services, including Keystone, as part of its cloud infrastructure curriculum. Understanding Keystone’s role in user management is essential for operating OpenStack environments.
For example, Juniper Contrail integrates with OpenStack Keystone to enforce authentication and authorization for network resources.
[Reference:, OpenStack Keystone Documentation, Juniper JNCIA-Cloud Study Guide: OpenStack Services, ]
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