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Bug 1961663

Summary:	Add missing section about restarting Cinder volume and backup docker on DCN
Product:	Red Hat OpenStack	Reporter:	Tzach Shefi <tshefi>
Component:	documentation	Assignee:	Alex McLeod <amcleod>
Status:	CLOSED CURRENTRELEASE	QA Contact:	RHOS Documentation Team <rhos-docs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	16.1 (Train)	CC:	amcleod, johfulto, ltoscano, rheslop
Target Milestone:	z6
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	2018924 (view as bug list)		Environment:
Last Closed:	2021-06-09 12:59:29 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:	1882054
Bug Blocks:	2018924

Description Tzach Shefi 2021-05-18 12:49:41 UTC

Description of problem:

On this guide:
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.1/html/distributed_compute_node_and_storage_deployment/assembly_deploying-storage-at-the-edge#updating-the-central-location_deploy-with-storage

Updating the central location, would cause the glance-api service to be restarted because it affect the glance configuration (/etc/glance/glance-api.conf). 

But Step 4.5 does *not* modify cinder's configuration, so as far as TripleO is concerned the cinder-volume and cinder-backup services don't need to be restarted. As such operation which need DCN site's RC file will fail.

For example if you wish to backup a volume from a DCN site to central site, failing to update c-backup via a docker restart will result in failed volume backup with an error such as this one:

2021-05-16 07:26:35.040 43 ERROR oslo_messaging.rpc.server FileNotFoundError: [Errno 2] No such file or directory: '/etc/ceph/dcn1.client.openstack.keyring'

Once Cinder backup docker is restarted backup works fine. 
Same is true for volume migration from DCN site to central site, this time however the Cinder volume docker needs to be restarted. 


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Comment 1 Tzach Shefi 2021-05-18 12:53:12 UTC

This is true for 16.1z6 we're just about to release, its true for all 16.1,
plus I suspect 16.2 versions too.

Comment 8 Alex McLeod 2021-06-02 12:27:43 UTC

Merged to osp161-train and main. Published to 16.1:
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.1/html-single/distributed_compute_node_and_storage_deployment/index#proc_backup-and-restore-across-edge-sites_deploy-with-storage

Roger - shall I leave this BZ open to track your MR?

Comment 9 Roger Heslop 2021-06-02 12:45:24 UTC

Alex, yes — once I get it reviewed and merged and I'll go ahead and close. You can assign it to me if that's easier.

Comment 13 Tzach Shefi 2021-06-09 07:22:49 UTC

Roger, Yes we're covered now.  
Thanks

Comment 14 Roger Heslop 2021-06-09 12:57:50 UTC

All content is merged and published