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Trying out Project CentOS boot development builds

Booting directly from KVM guest image

There's a provisional KVM guest image uploaded here:

https://fedorapeople.org/~walters/cloud-init-base-eln-20231029.qcow2.zst

You can run it using e.g. virt-install and in general all the same techniques that work the Fedora Cloud Base or the RHEL KVM guest image.

Once you've booted this, use e.g. bootc update to fetch updates.

Rebasing from Fedora CoreOS

Fedora CoreOS supports many different platforms, and can be used as a starting point to "rebase" to a custom derived image from CentOS boot.

systemctl mask --now zincati && rm -vf /run/ostree/staged-deployment-locked
echo "# dummy change" >> "/etc/sudoers.d/coreos-sudo-group"
rpm-ostree rebase ostree-unverified-registry:quay.io/centos-boot/fedora-tier-1:eln
systemctl reboot

See also this pull request for more information.

TODO: Use osbuild

Document the ongoing work to materialize a disk image from a container.

Using `bootc install-to-filesystem --replace=alongside` with a cloud image

A toplevel goal of this project is that the "source of truth" for Linux operating system management is a container image registry - as opposed to e.g. a set of qcow2 OpenStack images or AMIs, etc.

The latest development builds of bootc have support for bootc install-to-filesystem --replace=alongside. More about this core mechanic in the bootc install docs.

Here's an example set of steps to execute; this could be done via e.g. cloud-init configuration.

dnf -y install podman skopeo
podman run --rm --privileged --pid=host -v /:/target --security-opt label=type:unconfined_t quay.io/centos-boot/fedora-tier-1:eln bootc install-to-filesystem --target-no-signature-verification --karg=console=ttyS0,115200n8 --replace=alongside /target
reboot

Generating a derived container image

These examples just use a "stock" container image, and in the first case rely on user state being preserved by the rpm-ostree rebase.

What's much more interesting is to generate a custom derived container image, and target that instead. For more information, see

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