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bgrant0607's profile
Brian Grant
Brian Grant
Brian Grant
@bgrant0607

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Brian Grant

@bgrant0607

Google Cloud. Kubernetes Steering Committee emeritus, K8s SIG Architecture co-Chair emeritus, CNCF TOC member emeritus

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github.com/bgrant0607
Joined June 2014

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    1. Brian Grant‏ @bgrant0607 31 May 2019
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      I think I first mentioned this in Kubernetes in my big scheduling braindump comment: https://github.com/kubernetes/kubernetes/issues/4301#issuecomment-74355529 …. It came up again when I proposed maxUnavailable to moderate concurrent disruptions caused by updates during the design of Deployment:https://github.com/kubernetes/kubernetes/pull/12236#discussion_r36501373 …

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    2. Brian Grant‏ @bgrant0607 31 May 2019
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      That discussion was forked into https://github.com/kubernetes/kubernetes/issues/12611 …. Around that time, Matt Liggett (https://github.com/kubernetes/kubernetes/pulls?q=is%3Apr+author%3Amml+is%3Aclosed …) joined the GKE team from Borg SRE (woo hoo!). One of the first things Matt worked on was improving node drains:https://github.com/kubernetes/kubernetes/issues/6080 …

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    3. Brian Grant‏ @bgrant0607 31 May 2019
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      Together with @davidopp and @erictune4, we folded disruption budgets into the rescheduling design proposal: https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/rescheduling.md#disruption-budget …. (Rescheduling deserves its own thread -- I'll do that one next.) Implementation began in https://github.com/kubernetes/kubernetes/pull/24697 … andhttps://github.com/kubernetes/kubernetes/pull/25551 …

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    4. Brian Grant‏ @bgrant0607 31 May 2019
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      PodDisruptionBudget is now documented: https://kubernetes.io/docs/concepts/workloads/pods/disruptions/ … and https://kubernetes.io/docs/tasks/run-application/configure-pdb/ …. Try it out and give us feedback on how well it works for you. We're looking to advance it from beta to GA:https://github.com/kubernetes/enhancements/issues/85 …

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    8. Brian Grant‏ @bgrant0607 31 May 2019
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      Replying to @dave_universetf

      Presumably if N+2, that's intended for one planned and one unplanned disruption. PodDisruptionBudget can only moderate planned disruptions. Making maxUnavailable=1 should ensure one planned disruption at a time.

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      Brian Grant‏ @bgrant0607 31 May 2019
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      Replying to @dave_universetf

      Right. We have that issue in Colossus. I assume your storage system is on bare metal, that you don't have network-attached storage, and that you want to allow more than one node to be upgraded at a time?

      5:12 PM - 31 May 2019
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