Give me the low-down.
Flatcar Container Linux is a “friendly fork” of CoreOS Container Linux and so shares the same architecture, update and configuration model. Maintained by Kinvolk, a company that worked closely with CoreOS in the early days, it continues the original CoreOS vision with a distro that’s so close that in-place updates are virtually seamless.
What's in the box?
Migration from CoreOS Container Linux
How do you get from here to there?
Flatcar Container Linux offers a drop-in migration and in-place upgrade from CoreOS Container Linux. There is information for applying this manually in the case of a tailored deployment. The most concise approach to transition is just:
curl -sSL https://docs.flatcar-linux.org/update-to-flatcar.sh | bash
Production Readiness and Support
Should you trust it, and who can you turn to for help?
Flatcar Container Linux has been around for a couple of years, so is field hardened with testimonials from a number of large enterprise users. There are mailing lists for community support and Kinvolk offers commercial support with an enterprise service level agreement (SLA).