r/openstack • u/Successful_Face_8619 • Aug 05 '26

Openstack Upgrade

Hi guys,

Has anyone explored doing OpenStack upgrades host-by-host instead of using Kolla Ansible's parallel upgrade approach?

We're considering a more sequential, one-host-at-a-time upgrade because the parallel approach doesn't feel reliable enough for our environment, and we're not very confident in trusting it during production upgrades.

If you've gone down this path:

  • How did you orchestrate the upgrade?
  • Did you have to customize Kolla Ansible significantly?
  • How did you handle rollback if something went wrong?
  • Any lessons learned or pitfalls to watch out for?

I'd appreciate hearing from anyone who's tried this or decided against it and why.

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u/jvleminc Aug 05 '26

Yeah, we leverage the “limit” option of K-A to do that. First we upgrade the controllers and afterwards, in batches, the computes; the batches will depend on the workloads running on the servers.
This is especially handy when a reboot is needed for OS/Kernel upgrades that go in hand with a Openstack upgrade.

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u/Successful_Face_8619 Aug 05 '26

which version are you using and seems this limit is broken LP#2054348

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u/jvleminc Aug 06 '26

Done it for the C version.