Brussels / 2 & 3 February 2019

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ZFS Powered Magic Upgrades

Using boot environments for atomic in-place upgrades


Describe a system of using ZFS Boot Environments to quickly, safely, and atomically upgrade 100s of remote machines.

Overview: + How the file system hierarchy is modified to allow the systems to be upgraded in-place + How we use ZFS to create and deploy the boot environments + Simplifying the creation of the BEs using poudriere image + Extending poudriere image to support ZFS + Using zfsbootcfg to boot a new BE once + How we determine if the BE “works” and should be promoted to the default

Motivation: + We often have only SSH access to the machines, so we needed something that could self-recover just by power cycling the machine + No longer need to use freebsd-update, mergemaster, or etcupdate

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Photo of Allan Jude Allan Jude

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