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clarify control plane downgrade and/or rollback during HA upgrade #12327
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/wg lts |
/language en |
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/kind feature |
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/sig cluster-lifecycle |
etcd has one big gotcha WRT downgrades: sig-cluster-lifecycle in the face of kubeadm does officially claims downgrades as unsupported, but it mostly works if one tries it. yet kubeadm does perform static pod manifest rollback in case a AFAIK and after doing a quick check, other SIG CL tools claim downgrade as unsupported or tentative. |
lack of safe downgrades has got to be pretty discouraging for users that
would otherwise upgrade more regularly ...
…On Thu, Jun 4, 2020 at 9:14 AM Lubomir I. Ivanov ***@***.***> wrote:
etcd has one big gotcha WRT downgrades:
https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_4.md#downgrade
also AFAIK, 4->3 might not be supported. there was a google doc by the
etcd team discussing the future of etcd downgrades, but i cannot find it.
sig-cluster-lifecycle in the face of kubeadm does officially claims
downgrades as unsupported, but it mostly works if one tries it. yet kubeadm
does perform static pod manifest rollback in case a kubeadm upgrade
per-node command fails and this is already mentioned in the upgrade docs.
AFAIK and after doing a quick check, other SIG CL tools claim downgrade as
unsupported or tentative.
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/reopen |
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Follow up from #11060, tracked in #12329
What is tested/supported for control plane component downgrade, and for safe rollback during an HA control plane upgrade is not clear in user-facing documentation:
Relevant comments are copied here:
#11060 (comment)
#11060 (comment):
@kubernetes/sig-testing @kubernetes/sig-release @kubernetes/sig-cluster-lifecycle @kubernetes/sig-architecture-feature-requests
Page to Update:
https://kubernetes.io/docs/setup/version-skew-policy/ (or update to link to relevant docs)
The text was updated successfully, but these errors were encountered: