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Configuration specifications

CoreOS Configs must conform to a specific variant and version of the fcct schema, specified with the variant and version fields in the configuration.

See the Upgrading Configs page for instructions to update a configuration to the latest specification.

Stable specification versions

We recommend that you always use the latest stable specification for your operating system to benefit from new features and bug fixes. The following stable specification versions are currently supported in fcct:

Experimental specification versions

Do not use experimental specifications for anything beyond development and testing as they are subject to change without warning or announcement. The following experimental specification versions are currently available in fcct:

FCC specifications and Ignition specifications

Each version of the FCC specification corresponds to a version of the Ignition specification:

FCC variantFCC versionIgnition spec
fcos1.0.03.0.0
fcos1.1.03.1.0
fcos1.2.03.2.0
fcos1.3.03.2.0
fcos1.4.0-experimental3.3.0-experimental
rhcos0.1.03.2.0
rhcos0.2.0-experimental3.3.0-experimental