The document outlines the request flow for OpenStack, specifically focusing on the engineering services built around the OpenStack cloud software. It discusses the Keystone service for user authentication and the process of finding appropriate hosts through filtering and weighing. Additionally, it mentions polling for request instance status as part of the overall workflow.

1. OpenStack
Request
Flow
B U I LT F O R
Engineering
Services for openstack TM
OpenStackTM
CLOUD SOFTWARE

2. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

3. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

4. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

5. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

6. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

7. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

8. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

9. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

10. B U I LT F O R
Find
an
appropriate
host
via
filtering
and
weigh5ng
openstack TM
Update
instance
entry
with
host
ID
CLOUD SOFTWARE
www.mirantis.com Keystone

11. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

12. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

13. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

14. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

15. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

16. B U I LT F O R
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

17. B U I LT F O R
Poll
for
request
instance
status
openstack TM
CLOUD SOFTWARE
www.mirantis.com Keystone

18. Engineering Services for OpenStack