# flatcar/Flatcar

Flatcar project repository for issue tracking, project documentation, etc.

Repository: https://github.com/flatcar/Flatcar
Canonical: https://ross.abutalabs.com/products/flatcar
Homepage: https://www.flatcar.org
License: Apache-2.0
License Family: permissive
Topics: flatcar, kinvolk, hacktoberfest
Last push: 2026-08-21T11:11:54+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 3103, "days_push": 12, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1260, forks 150 (observed 2026-08-28T04:04:09.967769+00:00)

## What it is
Flatcar Container Linux is a minimal, immutable, container-optimized Linux distribution and the community-driven successor to CoreOS Container Linux. It ships a read-only filesystem, no package manager, and atomic automatic updates with rollback, designed to run container workloads across clouds, virtualization, and bare metal.

## Use cases
- run a minimal immutable OS for container workloads
- replace CoreOS Container Linux after its end of life
- deploy Kubernetes nodes with automated atomic OS updates
- provision cloud VMs with Ignition and Butane configs
- reduce attack surface with a read-only, package-manager-free OS
- manage OS updates across large fleets with release channels

## When to choose
- you run containerized workloads and want a minimal, immutable host OS
- you need automatic, atomic updates with automatic rollback
- you want a maintained successor to CoreOS Container Linux
- you deploy across multiple clouds, virtualization platforms, or bare metal

## When to avoid
- you need a general-purpose Linux distro with a package manager
- you install many non-containerized applications directly on the host
- you require a desktop or interactive workstation environment

## Facets
- artifact type: application
- maturity: active
- function: container-runtime, deployment, security, self-hosted, cloud
- domain: cloud-computing, operating-systems, self-hosted
- platform: cloud, self-hosted
- tags: immutable-os, container-linux, coreos-successor, atomic-updates, ignition, butane, minimal-os, container-optimized, containers, devops, linux, docker, kubernetes

## Member repositories
- flatcar/Flatcar (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:09.967769+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T05:04:23.361743+00:00, confidence not recorded.
  - readme: https://github.com/flatcar/Flatcar (fetched 2026-08-28T04:04:09.967769+00:00, sha 624b9e74ab24)
  - homepage: https://www.flatcar.org (fetched 2026-08-29T12:17:16.773909+00:00, sha a20a21f5e6a9)
  - site_page: https://www.flatcar.org/docs (fetched 2026-08-29T12:17:16.787544+00:00, sha b3ce796f1845)
  - site_page: https://www.flatcar.org/docs/latest (fetched 2026-08-29T12:17:16.791203+00:00, sha aa80c4a36931)
  - site_page: https://www.flatcar.org/blog/2026/07/a-fresh-coat-of-paint-for-the-flatcar-docs (fetched 2026-08-29T12:17:16.793362+00:00, sha e3b8cccaf3b2)
  - site_page: https://www.flatcar.org/releases (fetched 2026-08-29T12:17:16.783541+00:00, sha a478a1652882)
  - site_page: https://www.flatcar.org/faq (fetched 2026-08-29T12:17:16.789317+00:00, sha 17f34a1aaf7a)
- Data as of 2026-08-30T08:39:29.467469+00:00.