Bug 2088621

Summary: Scaling out after scaling in results in compute host with mismatch between index and host name
Product: Red Hat OpenStack Reporter: Artom Lifshitz <alifshit>
Component: openstack-tripleo-heat-templatesAssignee: OSP Team <rhos-maint>
Status: CLOSED NOTABUG QA Contact: Joe H. Rahme <jhakimra>
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Version: 16.2 (Train)CC: igallagh, jparker, mburns, ramishra
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Last Closed: 2022-05-25 03:38:48 UTC Type: Bug
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Description Artom Lifshitz 2022-05-19 21:03:31 UTC 
Description of problem:

This came up as part of the review for documentation MR [1]. When following the process outlined in section 16.3.2. Replacing a removed Compute node [2], the result is that the re-added compute host gets the correct index, but incorrect hostname. So for example, starting with compute-0, compute-1, and compute-2, scaling in compute-1, then readding compute-1, the node will be named compute-1 from the undercloud's POV, but the hostname (and therefore the nova-compute service) will be called compute-3.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:

1. As an example, start with 3 compute hosts, compute-0, compute-1, and compute-2.
2. Scale in to remove compute-1.
3. Scale out to replace the compute host.

Actual results:

New compute is called compute-1 from undercloud's POV, but the hostname is compute-3.


Expected results:

Both the node and the host should be compute-1.

[1] https://gitlab.cee.redhat.com/rhci-documentation/docs-Red_Hat_Enterprise_Linux_OpenStack_Platform/-/merge_requests/9130
[2] https://jenkins.dxp.redhat.com/job/CCS/job/ccs-mr-preview/25205/artifact/titles/director-installation-and-usage/preview/index.html#proc_removing-or-replacing-a-compute-node_scaling-overcloud-nodes
Comment 1 Artom Lifshitz 2022-05-19 21:04:54 UTC 
The full list of steps can be seen here: http://pastebin.test.redhat.com/1052055
Comment 3 Artom Lifshitz 2022-05-24 14:14:45 UTC 
@Irina @jparker I guess we need to amend [1] to include Rabi's suggestion, and retest? Or perhaps start by testing, then once it's confirmed amending the procedure?

[1] https://gitlab.cee.redhat.com/rhci-documentation/docs-Red_Hat_Enterprise_Linux_OpenStack_Platform/-/merge_requests/9130