Not able to list the compute_nodes mapped under single cell using nova-manage

[keerthivasan selvaraj]

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Description
===========
Currently I am not able to list the compute_nodes present under single cell using nova-manage. Only way to check the available compute_nodes under specific cell is from the host_mappings table.

Steps to reproduce
==================

* nova-manage cell_v2 list_hosts --cell_uuid <cell-uuid>
* No method found

Expected result
===============
nova-manage cell_v2 list_hosts --cell_uuid 1794f657-d8e9-41ad-bff7-01b284b55a9b

+----+----------+-----------+
| Id | Host | Cell Name |
+----+----------+-----------+
| 2 | compute2 | cell2 |
+----+----------+-----------+

Actual result
=============
No such method (list_hosts) found from nova-manage

Environment
===========

Using Devstack stable/pike, nova-manage (16.0.3 ).

[Matt Riedemann (mriedem)]

See #1 here:

https://docs.openstack.org/nova/latest/user/cells.html#faqs

This also came up in this review to remove the 'nova-manage host list' command:

https://review.openstack.org/#/c/521837/

So this is a valid bug in that we need a replacement for the 'nova-manage host list' workaround for this, we just haven't decided on what yet.

[Matt Riedemann (mriedem)]

I've marked this as High severity just because we need a replacement for the 'nova-manage host list' command workaround.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/524755

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/524755
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=c7b51a63b0c3b5ad80979060bbfe49287e6da847
Submitter: Zuul
Branch: master

commit c7b51a63b0c3b5ad80979060bbfe49287e6da847
Author: Hongbin Lu <email address hidden>
Date: Fri Dec 1 23:03:04 2017 +0000

    Add support for listing hosts in cellv2

    Add a ``nova-manage cell_v2 list_hosts`` command for listing hosts
    in one or all v2 cells.

    Change-Id: Ie8eaa8701aafac10e030568107b8e6255a60434d
    Closes-Bug: #1735687

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/531559

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/531559
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=df219f666c0b8b34911289accd1fe5739d8bf7d8
Submitter: Zuul
Branch: master

commit df219f666c0b8b34911289accd1fe5739d8bf7d8
Author: Hongbin Lu <email address hidden>
Date: Sat Jan 6 15:00:53 2018 +0000

    Update FAQs about listing hosts in cellv2

    Document the ``nova-manage cell_v2 list_hosts`` command for listing
    hosts in one or all v2 cells.

    Change-Id: I46fece55f1647fe7a41906054ad0d6213315187b
    Related-Bug: #1735687

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 17.0.0.0b3 development milestone.

[Matt Riedemann (mriedem)]

Removed pike and ocata from this bug report as potential backport targets since the change on master introduced a versioned object rpc bump which we generally don't backport, and there are options for listing hosts within a cell in pike and ocata, so it's less important there.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/563797

[OpenStack Infra (hudson-openstack)]

Change abandoned by Adam Harwell (<email address hidden>) on branch: stable/pike
Review: https://review.openstack.org/563797
Reason: OK, we'll look further into doing it that way. Thanks.