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Flatcar Container Linux

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description Flatcar Container Linux Overview

Flatcar Container Linux provides a secure and reliable operating system optimized for running containerized applications. Built upon immutable Linux principles, it simplifies server management through automated updates and robust security features. It is ideal for organizations deploying Kubernetes or other container orchestration platforms needing a stable, hardened base for their servers.

help Flatcar Container Linux FAQ

Why is Flatcar Container Linux described as immutable?

Its system partition is treated as a replaceable operating-system image rather than a collection of packages to modify by hand. Updates install a complete tested image and use a reboot to move the node onto that version.

Is Flatcar Container Linux a continuation of CoreOS Container Linux?

Yes, Flatcar began as a fork intended to preserve the minimal, automatically updated Container Linux model after CoreOS changed ownership and direction. Microsoft acquired the Flatcar project in 2024, while keeping it open source.

Can administrators install software with apt or dnf on Flatcar?

Flatcar is not designed around a conventional host package manager such as apt or dnf. Services should normally run in containers, while custom operating-system requirements are handled through provisioning, extensions, or custom images.

How are Flatcar nodes configured on first boot?

Flatcar commonly uses Ignition to apply machine configuration during initial provisioning. A deployment can use it to create files, configure systemd units, add users, and establish the node's network or cluster bootstrap settings.

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