Easy, automated upgrades with the `kubeadm upgrade` command

[lukemarsden]

Feature Description

• One-line feature description (can be used as a release note): A new command, kubeadm upgrade, allows you to automatically upgrade a cluster created by kubeadm
• Primary contact (assignee): @lukemarsden, @luxas
• Responsible SIGs: SIG-cluster-lifecycle
• Design proposal link (community repo):
  • https://docs.google.com/document/d/1PRrC2tvB-p7sotIA5rnHy5WAOGdJJOIXPPv23hUFGrY/edit
  • [WIP] Add kubeadm upgrades proposal community#825
• Reviewer(s) - (for LGTM) recommend having 2+ reviewers (at least one from code-area OWNERS file) agreed to review. Reviewers from multiple companies preferred: @luxas @jbeda
• Approver (likely from SIG/area to which feature belongs):
• Feature target (which target equals to which milestone):
  • Alpha release target (1.7): https://kubernetes.io/docs/tasks/administer-cluster/kubeadm-upgrade-1-7/
  • Beta release target (1.8 & 1.9): [WIP] Add kubeadm upgrades proposal community#825
  • Stable release target: 1.12

[idvoretskyi]

@lukemarsden the feature freeze for 1.7 has already gone (on Monday, May 1).

[lukemarsden]

@idvoretskyi yes, sorry – I've been slammed after DockerCon. I've been chatting to @calebamiles who said it might be possible to make an exception for this, please 🙏

[calebamiles]

I think this work was already scheduled by the SIG, @idvoretskyi the issue was simply filed late which I don't think is a huge deal.

[luxas]

Yeah, this has been planned for a while, thanks @calebamiles!

[idvoretskyi]

@lukemarsden @luxas sounds good to me, thanks.

[lukemarsden]

Making a call on this – we're not going to make it for 1.7. Let's bump this to 1.8. Sorry.

cc @idvoretskyi

[timothysc]

@lukemarsden is there a WIP fork or issue on this somewhere? Just wondering what the current state is.