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Red Hat turns a hardened Flask stack into a bootable RHEL 10 image

A new learning path walks developers from a local Python stack to a verified image-mode virtual machine using hardened containers, Quadlets and bootc.

Flask stack transformed into a bootable RHEL 10 image.
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By The News Desk· Sep 1, 2026the quick take — two AI hosts, this story only

Red Hat Developer has published a hands-on learning path that packages a Python web application and its operating environment into a bootable Red Hat Enterprise Linux 10 image. The path combines Flask, NGINX and PostgreSQL with Red Hat Hardened Images, Podman Quadlets and image mode for RHEL.

The material was published on August 31 and is organized as seven resources with an estimated completion time of one hour and 20 minutes. It starts with a locally running Flask application, moves the stack into containers managed as system services, and then turns the application and operating system into a single verified image that can boot as a virtual machine.

What the path teaches

The sequence is deliberately end to end. Developers first create and run the application locally, then use Podman Quadlets to manage the Flask stack as system services. Later sections package both the application and operating system into an image, create a bootable VM and cover how to manage and update the resulting environment.

Red Hat positions its Hardened Images as smaller, distroless application images containing only the software needed by the workload. The learning path’s practical argument is that reducing unused components can also reduce the vulnerability noise inherited by application teams.

Image mode supplies the operating-system half of the workflow. Instead of treating the application containers and host as separate delivery units, the exercise embeds the containerized stack into a bootable RHEL image. The same artifact can then run as a local VM and serve as the basis for deployment elsewhere.

Why platform teams should look at it

The interesting part is not Flask itself. The path demonstrates a delivery boundary in which application dependencies, service definitions and an approved operating system travel together as one image. That gives developers a reproducible artifact while keeping the runtime anchored to RHEL.

For platform engineers, the exercise is also a compact way to evaluate where Quadlets and bootc fit in a paved-road workflow. Quadlets express container services through systemd-compatible units, while image mode turns the configured operating environment into a versioned bootable artifact.

The path requires a RHEL subscription and a RHEL, CentOS Stream or Fedora workstation with subscription-manager. It is marked intermediate and does not present itself as a complete production reference architecture. Teams evaluating the pattern should treat it as a guided build: useful for understanding the mechanics before adding their own CI, policy checks, secrets handling and deployment controls.

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