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Ubuntu Summit 26 Demo

A demonstration of running containerized workloads on Ubuntu bootc using Quadlet.

Overview

This demo consists of two container images:

  1. httpd container - A simple Apache httpd server based on Ubuntu 26.04 serving a static webpage
  2. bootc host image - An Ubuntu bootable container image that runs the httpd container as a systemd service using Quadlet

Project Structure

  • Containerfile - Builds the httpd application container
  • host/Containerfile - Builds the bootc host image
  • host/usr/share/containers/systemd/httpd.container - Quadlet unit file for the httpd service
  • index.html - Static webpage served by httpd
  • .github/workflows/build.yml - CI workflow that builds and pushes images to ghcr.io

Building

Build the httpd container:

podman build -t ubuntu-summit-26-demo-httpd:latest .

Build the host image:

podman build -t ubuntu-summit-26-demo-host:latest ./host

Running

Run the httpd container standalone:

podman run -p 8080:80 ubuntu-summit-26-demo-httpd:latest

Then visit http://localhost:8080

Snap Support

The host image replaces the ostree symlinks (/home, /root, /opt, /mnt, /srv) with real directories backed by systemd bind mount units so that snap-confine can work on composefs. A snap.mount unit also bind-mounts /var/lib/snapd/snap onto /snap.

Fixing home directory permissions after first boot

If the system was originally provisioned (e.g. via cloud-init) before switching to this image, the home directory may be owned by root. Fix it after the first boot:

sudo chown -R <user>:<user> /home/<user>

For example:

sudo chown -R ubuntu:ubuntu /home/ubuntu

This is only needed once. Fresh deployments with this image will have correct ownership from the start.