tripleo-heat-templates/releasenotes/notes/nova_compute_el8_legacy-273...

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---
upgrade:
- |
For Nova computes that need to keep running EL8, you can replace
``OS::TripleO::Services::NovaLibvirt`` service with
``OS::TripleO::Services::NovaLibvirtLegacy`` in its role files to run the
monolithic libvirt. Unlike the modular deamons consumable with EL9
computes, that legacy service should only be used for Train to Wallaby
skip-level (fast-forward) upgrades, and should not be used in new
deployments.