Fedora CoreOS is Red Hat’s official successor to CoreOS Container Linux. However, it is not a direct descendant of CoreOS: it is rather a merging of the former Red Hat Atomic Host with CoreOS Container Linux.
Migration from CoreOS Container Linux
The official documentation on migrating from CoreOS Container Linux to Fedora CoreOS highlights some key differences between the two operating systems:
Production Readiness and Support
Fedora CoreOS has been generally available since January 2020. As the upstream project that Red Hat takes and subsequently hardens before releasing as enterprise products, Fedora CoreOS is inherently not targeting enterprise stability. Red Hat states that Fedora CoreOS “may occasionally include regressions or breaking changes for some use cases or workloads”.
Fedora CoreOS is a community project and no commercial support, or committed service level agreement, is available.