Previous article: OpenStack Components
Horizon – Dashboard
Horizon provides a modular web-based user interface for all the OpenStack services. With this web GUI, you can perform most operations on your cloud like launching an instance, assigning IP addresses and setting access controls.
Keystone – Identity
Keystone is a framework for authentication and authorization for all the OpenStack services. Keystone handles API requests and provides configurable catalog, policy, token and identity services.
Keystone also implements the ability to add users to groups (also known as tenants or projects) and to manage permissions between users and groups. Permissions include the ability to launch and terminate instances.
Keystone can be integrated with LDAP and other external authentication providers.