hi George here goes my take on migrating (not linuxbridge, but ovs) to OVN, that you may take some "inspiration" https://github.com/mariojmdavid/migrate-to-ovn best Mario On 11/7/25 14:41, lmihaiescu@gmail.com wrote:
Hi Ricardo,
We're in the same situation (Openstack-Ansible installed cloud) that's been in production for many years using Linuxbridge and a combination of VLAN and VXLAN networks running Openstack 2024.1 with the VMs using a mix of Ceph and local storage.
We planned to upgrade to 2025.1, but the removal of the Linuxbridge mechanism driver complicates things massively. The CERN blog series (https://techblog.web.cern.ch/techblog/post/linuxbridge-ovn-migration-part-3/) and https://www.jimmdenton.com/migrating-lxb-to-ovn/ are useful as a starting point, but they are either too site specific (e.g. CERN's mega cells) or too lab-like environments, so I was hoping to hear from somebody who actually did this in a more "standard" Openstack deployment.
We can shutdown the instances and take everything down for a weekend, but it doesn't seem to be a risk free way of doing the upgrade.
Thanks a lot for any insight you or anyone else can provide.
Thanks, George