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* Problem: Fedora CoreOS images are manually uploaded to GCP. When a cluster is created with a stale image, Zincati immediately checks for the latest stable image, fetches, and reboots. In practice, this can unfortunately occur exactly during the initial cluster bootstrap phase. * Recommended: Upload the latest Fedora CoreOS image regularly * Mitigation: Allow a failed bootstrap.service run (which won't touch the done ConditionalPathExists) to be re-run by running `terraforma apply` again. Add a known issue to CHANGES * Update docs to show the current Fedora CoreOS stable version to reduce likelihood users see this issue Longer term ideas: * Ideal: Fedora CoreOS publishes a stable channel. Instances will always boot with the latest image in a channel. The problem disappears since it works the same way AWS does * Timer: Consider some timer-based approach to have zincati delay any system reboots for the first ~30 min of a machine's life. Possibly just configured on the controller node https://github.com/coreos/zincati/pull/251 * External coordination: For Container Linux, locksmith filled a similar role and was disabled to allow CLUO to coordinate reboots. By running atop Kubernetes, it was not possible for the reboot to occur before cluster bootstrap * Rely on https://github.com/coreos/zincati/issues/115 to delay the reboot since bootstrap involves an SSH session * Use path-based activation of zincati on controllers and set that path at the end of the bootstrap process Rel: https://github.com/coreos/fedora-coreos-tracker/issues/239 |
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