BSD
Allan Jude
ZFS Powered Magic Upgrades
Using boot environments for atomic in-place upgrades
Saturday 16:00-16:40
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K.3.401
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