Fedora CoreOS is an automatically updating, minimal, monolithic, container-focused operating system, designed for clusters but also operable standalone, optimized for Kubernetes but also great without it. It aims to combine the best of both CoreOS Container Linux and Fedora Atomic Host, integrating technology like Ignition from Container Linux with rpm-ostree and SELinux hardening from Project Atomic. Its goal is to provide the best container host to run containerized workloads securely and at scale.
Fedora CoreOS is an open source project associated with the Fedora Project. We are aiming for high compatibility with existing Container Linux configuration and user experience, and we expect to provide documentation and tooling to help migrate from Container Linux to Fedora CoreOS.
Fedora CoreOS (FCOS) has no install-time configuration. Every FCOS system begins with a generic disk image. For each deployment mechanism (cloud VM, local VM, bare metal), configuration can be supplied at first boot. FCOS reads and applies the configuration file with Ignition. For cloud deployments, Ignition gathers the configuration via the cloud’s user-data mechanism. In the case of bare metal, Ignition injects the configuration at install time.
