Minor upgrade Overcloud nodes one by one

Issue

• We are planning to perform next week a RHOSP 13 minor upgrade from RHOSP 13.0.5 to latest.

• We are planning to perform the below upgrade in regards to our OVS-DPDK COmputes :

1. Evacuate VM’s from a specific Compute
2. Run update targeted on that compute
3. Reboot
4. Health Checks
5. Migrate VM’s back to that compute.
6. Restart procedure for next compute.

• The above procedure is documented in upstrem openstack documentation:

openstack overcloud update run
The update run command utilizes the previously generated Heat stack outputs. It downloads the playbook yamls and their included task list yaml via the config-download mechanisms, and executes the update steps playbook.
The command accepts --nodes or --roles argument to limit which nodes will be targeted during a particular update run execution. Even if the limit matches multiple nodes (e.g. all nodes within one role), the play is executed with serial: 1, meaning that all actions are finished on one node before starting the update on another.
usage: openstack overcloud update run [-h] --nodes NODES [--playbook PLAYBOOK]
                                      [--ssh-user SSH_USER]
                                      [--static-inventory STATIC_INVENTORY]
                                      [--stack STACK]

• But not on Red Hat openstack documentation , where we have only the posibility of indicating the overcloud role (and not an overcloud specific node).

• Could you please mention if the targeted node update is supported and maybe you could update the RHOSP documentation to reflect that .