CoreOS Builder

CoreOS Builder (coreos-builder) is a container to ease reprovisioning some bare metal Fedora CoreOS (FCOS) instances.

The single purpose of this container is to execute the coreos-builder script which

• downloads the latest raw image of Fedora CoreOS, and
• compiles a generic x86_64 binary of coreos-installer (Rust target: x86_64-unknown-linux-gnu).

Both the coreos-installer binary as well as the downloaded FCOS raw images are being stored in /var/local/coreos-builder. Additionally a fedora-coreos-latest.x86_64.raw.xz symlink that points to the latest image is created. /var/local/coreos-builder is expected to be a volume. You can (and probably should) delete this container right after execution.

The goal of this project is to ease reprovisioning a FCOS instance on bare metal platforms on which the recommended ISO-/PXE-based reprovisioning process isn't possible. This can be true for some cloud platforms, too.

To do so you first run this container to download FCOS' latest raw image and compile coreos-installer. You then reboot into an arbitrary live system, mount the partition which stores /var/local/coreos-builder and run coreos-installer install with the --image-file option.

coreos-installer is built from the latest crates.io sources. Running this container will always give you the latest version of coreos-installer. Due to the nature of this container, it doesn't need frequent rebuilds. Thus it is rebuild only once a month, precisely on the 12th day at 21:50 UTC.