- Mastering OpenStack(Second Edition)
- Omar Khedher Chandan Dutta Chowdhury
- 95字
- 2021-07-02 23:52:50
The Keystone service
The Keystone service provides identity and service cataloging in OpenStack. All other services in OpenStack must register with Keystone with their API endpoints. Keystone thus keeps a catalog of various services running in your OpenStack cloud that can be queried using the Keystone REST APIs.
Keystone also maintains a policy engine which provides rule-based access and authorization of services.
The Keystone service itself is composed of multiple providers that work in conjunction with each other. Each of these providers implements a concept in the Keystone architecture:
- Identity
- Resource
- Authorization
- Token
- Catalog
- Policy

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