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Archived 3/8/2024

All examples for bootc OCI bootable containers and image-based OS moved here

Bootable container images with autoupdate systemd service

This repository shows an example to customize a base bootc image with desired features. This repository also contains quadlet files (for running systemd managed podman containers) to embed an AI chat application, Use the examples from this repository to create your own customized bootc-enabled operating system image.

Get started with a bootc-enabled virtual machine

To launch a bootc-enabled virtual machine with KVM/QEMU, see virt-install document

Customize the bootc image

To build a custom bootc image derived from quay.io/centos-bootc/centos-bootc:stream9, customize the Containerfile as desired, then run

podman build -t quay.io/your-repo/your-os:tag .
podman push quay.io/your-repo/your-os:tag
ssh -i ~/.ssh/your-key centos@vm-ipaddress

sudo bootc switch quay.io/your-repo/your-os:tag
sudo reboot

Convert from AWS CentOS, RHEL (non-ostree based) system to a bootc enabled system.

From a centOS 9 or RHEL 9 ec2 instance: See bootc install docs for more info.

ssh ec2-user@vm-ipaddress
sudo su
podman run --rm --privileged -v /:/target \
             --pid=host --security-opt label=type:unconfined_t \
             quay.io/centos-bootc/centos-bootc-cloud:stream9 \
             bootc install to-filesystem --replace=alongside /target
systemctl reboot

Note: When you ssh in again, the cloud user has changed from ec2-user to cloud-user in AWS instance. The system is now bootc enabled and tracking the given OCI image for updates

Base bootc images

The base images available currently are listed below.

# for customizing CentOS or RHEL OS image
FROM quay.io/centos-bootc/centos-bootc:stream9

# for customizing cloud images (AMIs) that are CentOS or RHEL based
FROM quay.io/centos-bootc/centos-bootc-cloud:stream9

# for customizing fedora OS image
FROM quay.io/centos-bootc/fedora-bootc:eln

Auto-update with bootable OCI image

The base bootc images are configured with podman-autoupdate. With podman-autoupdate the system is updated by pushing a new bootc OCI image to a registry - on a timer, when the image digest changes, the host will automatically fetch it and reboot with bootc upgrade --apply.

To switch the bootc image that your system is tracking, run

bootc switch quay.io/your/newimage:custom

Upon a reboot, the system will now be running with your custom OS. At the time of this writing, it is not possible to switch from a CentOS based bootc image to a Fedora based image, or vice versa.

How do I run the python chatbot AI example?

Embedded in the bootable image built from bootc-build/Containerfile are quadlet files for running an AI powered chatbot. The files /etc/containers/systemd/chatbot.kube, /etc/containers/systemd/chatbot.yaml, and /etc/systemd/chatbot.image result in a systemd service, chatbot that includes an LLM, a model-service, and an example application. This service manages a podman pod.

Interact with the application by navigating to the browser at http://machine-ip:8080 or http://machine-ip:8051 depending on which chatbot is embedded.