I've had a quick look at this to see if it is easy, but I don't immediately see a way of doing it without incurring a relatively high maintenance cost of lots of individual YAML files in hieradata/hosts.

We would need to match all of the cluster host names mentioned in the various cirrus.yaml files. e.g. here.

The only other way I could think of doing it would be to split the current role::elasticsearch::cirrus into two discrete roles, one with the omega instance the other with the psi instance installed.

Oh, maybe we could use hieradata/regex.yaml but that is still a bit fiddly.

Many of us in Data Platform SRE and/or Search Platform have looked this over, and I think we're in agreement that @Vgutierrez 's original suggestion is the least bad way to move the migration forward.

"The only alternative I see right now is setting profile::lvs::realservers::pools values per instance in hiera, cause all of those share the same puppet role and puppet profiles"

regex.yaml (suggested by Ben and others) could work, but seems more error-prone than hostvars, so we will move forward with the host-specific hieradata approach.

Change #1130162 had a related patch set uploaded (by Bking; author: Bking):

[operations/puppet@production] elastic: add test hieradata to help with LVS migration

https://gerrit.wikimedia.org/r/1130162

Change #1138400 had a related patch set uploaded (by Bking; author: Bking):

[operations/puppet@production] elasticsearch: filter LVS config based on cluster membership

https://gerrit.wikimedia.org/r/1138400

Let's finish the OpenSearch migration first (T388610)

Change #1138400 merged by Bking:

[operations/puppet@production] elasticsearch: filter LVS config based on cluster membership

https://gerrit.wikimedia.org/r/1138400

Change #1159459 had a related patch set uploaded (by Bking; author: Bking):

[operations/puppet@production] elasticsearch: filter LVS config based on cluster membership

https://gerrit.wikimedia.org/r/1159459

Change #1159459 merged by Bking:

[operations/puppet@production] elasticsearch: filter LVS config based on cluster membership

https://gerrit.wikimedia.org/r/1159459

Mentioned in SAL (#wikimedia-operations) [2025-06-16T15:17:27Z] <inflatador> bking@cumin2002:~$ sudo cumin A:lvs-low-traffic 'run-puppet-agent' T387569

Change #1159517 had a related patch set uploaded (by Bking; author: Bking):

[operations/puppet@production] cirrussearch: move soon-to-be-decommed hosts to insetup role

https://gerrit.wikimedia.org/r/1159517

Change #1159517 merged by Ryan Kemper:

[operations/puppet@production] cirrussearch: move soon-to-be-decommed hosts to insetup role

https://gerrit.wikimedia.org/r/1159517

Change #1130162 abandoned by Bking:

[operations/puppet@production] elastic: add test hieradata to help with LVS migration

Reason:

no longer needed

https://gerrit.wikimedia.org/r/1130162