Flatcar Container Linux

Flatcar Container Linux is a CNCF incubating minimal, immutable Linux distribution designed for running containers. It provides automatic atomic updates through the Nebraska update server, ensuring nodes stay secure and consistent. Flatcar supports Kubernetes deployments on bare metal, cloud, and virtual environments with a focus on security and operational simplicity.

Flatcar Container Linux publishes 8 APIs on the APIs.io network, including Activity API, Apps API, Channels API, and 5 more. Tagged areas include Cloud-Native, Containers, Immutable Infrastructure, Incubating, and Linux.

Flatcar Container Linux’s developer surface includes authentication, documentation, release notes, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.9/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-08-24 · rubric v0.13.0

AccessFreemiumSelf serve⚡ Free to try

8 APIs

Cloud-Native ContainersImmutable InfrastructureIncubating Linux Operating System

Kin Score

Kin Score How this is scored →
scored 2026-08-24 · rubric v0.13.0

Composite quality — 31.9/100 · thin

Contract Quality 11.3 / 25

Developer Ergonomics 5.2 / 20

Access Clarity 3.2 / 20

Operational Transparency 4.8 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/flatcar-container-linux: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 8

Individual APIs this provider publishes, each with its own machine-readable definition.

Open Collections 10

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Rate Limits 1

Documented rate limits and quota policies.

Flatcar Container Linux Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

SourceCode

SourceCode

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

ReleaseNotes

Community

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

NebraskaSource

NebraskaSource

Source (apis.yml)

aid: flatcar-container-linux
name: Flatcar Container Linux
description: Flatcar Container Linux is a CNCF incubating minimal, immutable Linux distribution designed for running containers.
  It provides automatic atomic updates through the Nebraska update server, ensuring nodes stay secure and consistent. Flatcar
  supports Kubernetes deployments on bare metal, cloud, and virtual environments with a focus on security and operational
  simplicity.
url: https://raw.githubusercontent.com/api-evangelist/flatcar-container-linux/refs/heads/main/apis.yml
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flatcar-container-linux.png
tags:
- Cloud-Native
- Containers
- Immutable Infrastructure
- Incubating
- Linux
- Operating System
tags_raw:
- Cloud Native
- Containers
- Immutable Infrastructure
- Incubating
- Linux
- Operating System
created: '2026-03-16'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
access: Open Source
position: Producer
apis:
- aid: flatcar-container-linux:flatcar-container-linux-activity-api
  name: Flatcar Container Linux Activity API
  description: The Activity API from Flatcar Container Linux — 1 operation(s) for activity.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Activity
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-activity-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-apps-api
  name: Flatcar Container Linux Apps API
  description: The Apps API from Flatcar Container Linux — 17 operation(s) for apps.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Application
  tags_raw:
  - Apps
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-apps-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-channels-api
  name: Flatcar Container Linux Channels API
  description: The Channels API from Flatcar Container Linux — 2 operation(s) for channels.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Channels
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-channels-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-config-api
  name: Flatcar Container Linux Config API
  description: The Config API from Flatcar Container Linux — 1 operation(s) for config.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Config
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-config-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-health-api
  name: Flatcar Container Linux Health API
  description: The Health API from Flatcar Container Linux — 1 operation(s) for health.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-health-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-instances-api
  name: Flatcar Container Linux Instances API
  description: The Instances API from Flatcar Container Linux — 1 operation(s) for instances.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Instances
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-instances-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-login-api
  name: Flatcar Container Linux Login API
  description: The Login API from Flatcar Container Linux — 3 operation(s) for login.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Login
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-login-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-update-api
  name: Flatcar Container Linux Update API
  description: The Update API from Flatcar Container Linux — 1 operation(s) for update.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags: []
  tags_raw:
  - Update
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-update-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
common:
- type: IssueTracker
  url: https://github.com/flatcar/nebraska/issues
- type: Releases
  url: https://github.com/flatcar/nebraska/releases
- type: SecurityPolicy
  url: https://github.com/flatcar/nebraska/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/flatcar/nebraska/blob/main/code-of-conduct.md
- type: ContributionGuide
  url: https://github.com/flatcar/nebraska/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/flatcar/nebraska/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/flatcar-container-linux-agentic-access.yml
- type: DomainSecurity
  url: security/flatcar-container-linux-domain-security.yml
- type: Authentication
  url: authentication/flatcar-container-linux-authentication.yml
- type: Website
  url: https://www.flatcar.org
- type: Documentation
  url: https://www.flatcar.org/docs/latest/
- type: GitHubOrganization
  url: https://github.com/flatcar
- type: SourceCode
  url: https://github.com/flatcar/flatcar
- type: NebraskaSource
  url: https://github.com/flatcar/nebraska
- type: ReleaseNotes
  url: https://www.flatcar.org/releases/
- type: Community
  url: https://www.flatcar.org/community/
- url: https://www.flatcar.org/blog/index.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/flatcar-container-linux"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/flatcar-container-linux/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/flatcar-container-linux/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.