[Gigablah]

Just to add on: I've had fleet misreport unit status and btrfs reporting lack of disk space for no apparent reason. Also the inability to restart individual failed units which are part of a global unit.

Also there was that one time they changed how cloud-config was parsed, so if "#cloud-config" wasn't on the very first line without preceeding spaces, initialisation would fail. That was when I switched the reboot strategy to manual.

[ecnahc515]

Btrfs is no longer the default for CoreOS for this reason. Overlayfs doesn't have this issue.

[saryant]

Oh man, yes. I'd blocked all my scaring memories of btrfs biting me in the ass.