Bug 1861854

Summary: [RFE] Provide method to update central DCN stack with minimal service interruption
Product: Red Hat OpenStack Reporter: John Fulton <johfulto>
Component: tripleo-ansibleAssignee: John Fulton <johfulto>
Status: CLOSED DEFERRED QA Contact: Mike Abrams <mabrams>
Severity: high Docs Contact:
Priority: high    
Version: 16.2 (Train)CC: gcharot, gfidente, spower, yrabl
Target Milestone: z2Keywords: FutureFeature, Triaged
Target Release: 16.2 (Train on RHEL 8.4)   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-09-08 14:38:04 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1859692    
Bug Blocks: 1802774    

Description John Fulton 2020-07-29 17:59:04 UTC 
When using DCN with storage, after additional Ceph clusters are added at edge sites the central heat stack must be updated [1] so that the cephx keys of the new ceph clusters are available to the ceph clients and so that the central glance configuration had entries for the new glance backends (which are the new ceph clusters). 

All of this is possible today, but the update of the central stack could be less disruptive. E.g. in theory we should be able to rehub, not restart, the glance contianers and no other services need to be restarted.

This RFE tracks giving TripleO the ability to do the above.


[1] https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/features/distributed_multibackend_storage.html#update-central-site-to-use-additional-ceph-clusters-as-glance-stores
Comment 2 John Fulton 2020-08-12 20:28:24 UTC 
On resolution undo result of docbug 1868487
Comment 5 John Fulton 2021-09-08 14:38:04 UTC 
This work would be non-trivial and is not a high enough priority to pursue at this time (as per a conversation with PM and Engineering).