Bug 1677431

Summary:	[RFE] Requesting playbooks to scale up and scale down Ceph Manager, RGW, and RBD-Mirror services
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	John Fulton <johfulto>
Component:	Ceph-Ansible	Assignee:	Dimitri Savineau <dsavinea>
Status:	CLOSED ERRATA	QA Contact:	Ameena Suhani S H <amsyedha>
Severity:	medium	Docs Contact:	Erin Donnelly <edonnell>
Priority:	low
Version:	4.0	CC:	amsyedha, aschoen, ceph-eng-bugs, ceph-qe-bugs, dsavinea, edonnell, gabrioux, gfidente, gmeno, jstransk, nthomas, pasik, ridave, shan, tserlin, vashastr
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	4.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-ansible-4.0.7-1.el8cp, ceph-ansible-4.0.7-1.el7cp	Doc Type:	Enhancement
Doc Text:	.Ansible playbooks for scaling of all Ceph services Previously, `ceph-ansible` playbooks offered limited scale up and scale down features only to core Ceph products, such as Monitors and OSDs. With this update, additional Ansible playbooks allow for scaling of all Ceph services.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-01-31 12:45:38 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:	1787516, 1787567
Bug Blocks:	1624388, 1730176

Description John Fulton 2019-02-14 21:55:02 UTC

If a customer wishes to upgrade from RHEL7 to RHEL8 but RHEL8 doesn't offer an option to do an in-place upgrade and the server would need to be re-provisioned with RHEL8, then how will this be handled if each of those RHEL7 servers are parts of a Ceph cluster?

In that scenario, it seems better to tell Ceph that the service has been removed and add it back as if it's a new service than to simply turn the node off because Ceph will keep looking for the missing service.

ceph-ansible has infrastructure playbooks to remove parts of a cluster and add those parts back which are useful when nodes are reprovisioned. We don't have playbooks like this for all Ceph daemons however. This is an RFE to track a request for those missing daemons, particularly, the ones that Red Hat OpenStack Platform deploys.

I. scale up:

- ceph-osd: https://github.com/ceph/ceph-ansible/blob/master/infrastructure-playbooks/add-osd.yml
- ceph-mon: https://github.com/ceph/ceph-ansible/pull/3547
- ceph-mds: https://github.com/ceph/ceph-ansible/pull/3599
- ceph-rgw: missing
- ceph-rbd-mirror: missing
- ceph-mgr: missing

II. scale down:

- ceph-osd: https://github.com/ceph/ceph-ansible/blob/master/infrastructure-playbooks/shrink-osd.yml
- ceph-mon: https://github.com/ceph/ceph-ansible/blob/master/infrastructure-playbooks/shrink-mon.yml
- ceph-mds: missing
- ceph-rgw: missing
- ceph-rbd-mirror: missing
- ceph-mgr: missing

Comment 5 Rishabh Dave 2019-05-06 12:58:28 UTC

scale up MGR PR - https://github.com/ceph/ceph-ansible/pull/3931
scale up RBD mirror PR - https://github.com/ceph/ceph-ansible/pull/3807
scale up RGW PR - https://github.com/ceph/ceph-ansible/pull/3889

Comment 6 Rishabh Dave 2019-05-08 13:09:04 UTC

The above PRs are merged in master and stable-4.0 so this BZ is partially fulfilled.

Comment 8 Rishabh Dave 2019-06-03 06:00:27 UTC

Playbooks for scaling down MGR, RBD-mirror and RGW needs to be written.

Comment 10 Giridhar Ramaraju 2019-08-05 13:11:16 UTC

Updating the QA Contact to a Hemant. Hemant will be rerouting them to the appropriate QE Associate. 

Regards,
Giri

Comment 11 Giridhar Ramaraju 2019-08-05 13:12:16 UTC

Updating the QA Contact to a Hemant. Hemant will be rerouting them to the appropriate QE Associate. 

Regards,
Giri

Comment 34 errata-xmlrpc 2020-01-31 12:45:38 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:0312