coreos-ct ☆

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Description:
Convert a Container Linux Config into Ignition

Type: Formula | Latest Version: 0.9.4@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Devops

Tags: coreos flatcar ignition provisioning devops container-linux

Install: brew install coreos-ct

About:
CoreOS Container Linux Config (CT) is a tool that converts Container Linux Configs into Ignition Configs. It allows users to write human-readable YAML configurations that are then transpiled into the JSON format required by Ignition for provisioning CoreOS/Flatcar machines. This provides a more stable and declarative approach to system configuration during the initial boot process.

Key Features:

Transpiles YAML Container Linux Configs to JSON Ignition Configs
Validates configuration syntax before conversion
Provides a declarative approach to machine provisioning
Integrates with the CoreOS/Flatcar boot process

Use Cases:

Automating server provisioning for CoreOS/Flatcar clusters
Generating Ignition configs from version-controlled YAML files
Migrating legacy CoreOS configurations to newer Ignition standards

Alternatives:

Butane – Butane is the successor to coreos-ct, specifically designed for newer Flatcar Linux versions and Ignition spec 3.x.

License: Apache-2.0

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, arm64_big_sur, sonoma, ventura, monterey, big_sur, catalina, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 14, 2025 1:29am		0	VERSION_BUMP	b243aad6
Sep 30, 2023 5:56pm		0	VERSION_BUMP	b3b40b0b