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Supported wherever you run your containers

What is a Container Linux?

The introduction of container-based infrastructure was a paradigm shift. A Container-optimized Linux distribution is the best foundation for cloud native infrastructure.

A minimal OS image only includes the tools needed to run containers. No package manager, no configuration drift.


Delivering the OS on an immutable filesystem eliminates a whole category of security vulnerabilities.


Automated atomic updates mean you get the latest security updates and open source technologies.

The Container Infrastructure OS

Flatcar Container Linux is designed from the ground up for running container workloads. It fully embraces the container paradigm, including only what is required to run containers.

Immutable infrastructure

Your immutable infrastructure deserves an immutable Linux OS. With Flatcar Container Linux, you manage your infrastructure, not your configuration.

Designed to scale

Flatcar Container Linux includes tools to manage large-scale, global infrastructure. You can manage update polices, versions and group instances with ease.

Reduced complexity

With containers, dependencies are packaged and delivered in container images. This makes package managers unnecessary and simplifies the OS.

Secure by Design

Flatcar Container Linux's built-in security features, minimal design and automated updates provide a strong foundation for your infrastructure's security strategy.

Security patch automation

Running the latest security patches is crucial to removing potential vulnerabilities. Flatcar Container Linux’s automated updates does this for you.

Immutable filesystem

By making the system partition read-only, Flatcar Container Linux eliminates a whole class of high-impact security vulnerabilities.

Minimal attack surface

Flatcar Container Linux includes only what is required to run containers. By minimizing the size and complexity of the OS, the attack surface is also reduced.

Automated Updates

With Flatcar Container Linux, you'll always be running the most stable, secure and up-to-date Flatcar version by taking advantage of the automated, atomic update feature.

Self-driving updates

Flatcar Container Linux uses the same reliable update mechanism as Google’s ChromeOS to provide safe, secure and automated system updates.

Always up-to-date

With Flatcar Container Linux’s automated updates, you’ll benefit from always running the most stable, secure and feature-rich version of the OS.

Managed updates

The Kinvolk Update Service allows for defining instance groups, assigning update channels and controlling the frequency, time of day and rate of updates.

Migrating from CoreOS Container Linux

Drop-in replacement for CoreOS

Flatcar Container Linux is directly derived from CoreOS, enabling seamless in-place migration.

Learn more »

Migrating from CoreOS Container Linux

Upgrading to Flatcar Container Linux is the same as a CoreOS update.

CoreOS to Flatcar migration demo

Enterprise Support and more

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Standard (business hours) and Premium (24x7) support.

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Access to Kinvolk's customer portal for KB and ticket management.

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Assigned customer success engineer, backed up by a global engineering team.

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What folks are saying about us!

CoreOS strives for the highest technical standards in our open source projects, and the developers at Kinvolk have consistently met and surpassed these standards. The expansive technical depth of the Kinvolk team has helped ensure that rkt is optimally integrated with the core Linux technologies rkt relies on, such as systemd and the kernel itself.

Jon Boulle · CoreOS

If you're looking for a top-tier team of seasoned open source contributors in the container space (from Linux kernel to Docker to Kubernetes and everything in between), hire Kinvolk. Each time I visited their office in Berlin, I left smarter than I walked in.

Jérôme Petazzoni, Former SRE Manager @ Docker, leading Kubernetes trainer

We are glad we chose to work with Kinvolk. They delivered what they promised, to a tight schedule. Kinvolk’s Lokomotive sets us up with a flexible multi-cloud architecture for the future, enabling us to cost-effectively deliver superior solutions to our customers.

Bruno Wozniak · PubNative

Kinvolk Update Service

Kinvolk Update Service allows for easily and safely monitoring and managing Flatcar Container Linux updates across your infrastructure.


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