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Container Linux Config Transpiler

The Config Transpiler ("ct" for short) is the utility responsible for transforming a human-friendly Container Linux Config into a JSON file. This resulting file can be provided to a Container Linux machine when it first boots to provision the machine.

NOTE: This tool is for Container Linux, not Fedora CoreOS. See FCCT for the Fedora CoreOS equivalent.

Documentation

If you're looking to begin writing configs for your Container Linux machines, check out the getting started documentation.

The configuration documentation is a comprehensive resource specifying what options can be in a Container Linux Config.

For a more in-depth view of ct and why it exists, take a look at the Overview document.

Please use the bug tracker to report bugs.

Examples

There are plenty of small, self-contained examples in the documentation.

Installation

macOS homebrew

brew install coreos-ct

Prebuilt binaries

The easiest way to get started using ct is to download one of the binaries from the releases page on GitHub.

One can use the following script to download and verify the signature of Config Transpiler:

# Specify Config Transpiler version
CT_VER=v0.6.1

# Specify Architecture
# ARCH=aarch64 # ARM's 64-bit architecture
ARCH=x86_64

# Specify OS
# OS=apple-darwin # MacOS
# OS=pc-windows-gnu.exe # Windows
OS=unknown-linux-gnu # Linux

# Specify download URL
DOWNLOAD_URL=https://github.com/coreos/container-linux-config-transpiler/releases/download

# Remove previous downloads
rm -f /tmp/ct-${CT_VER}-${ARCH}-${OS} /tmp/ct-${CT_VER}-${ARCH}-${OS}.asc /tmp/coreos-app-signing-pubkey.gpg

# Download Config Transpiler binary
curl -L ${DOWNLOAD_URL}/${CT_VER}/ct-${CT_VER}-${ARCH}-${OS} -o /tmp/ct-${CT_VER}-${ARCH}-${OS}
chmod u+x /tmp/ct-${CT_VER}-${ARCH}-${OS}

# Download and import CoreOS application signing GPG key
curl https://coreos.com/dist/pubkeys/app-signing-pubkey.gpg -o /tmp/coreos-app-signing-pubkey.gpg
gpg2 --import --keyid-format LONG /tmp/coreos-app-signing-pubkey.gpg

# Download and import CoreOS application signing GPG key if it has not already been imported
curl -L ${DOWNLOAD_URL}/${CT_VER}/ct-${CT_VER}-${ARCH}-${OS}.asc -o /tmp/ct-${CT_VER}-${ARCH}-${OS}.asc
gpg2 --verify /tmp/ct-${CT_VER}-${ARCH}-${OS}.asc /tmp/ct-${CT_VER}-${ARCH}-${OS}

Building from source

To build from source you'll need to have the go compiler installed on your system.

git clone --branch v0.8.0 https://github.com/coreos/container-linux-config-transpiler
cd container-linux-config-transpiler
make

The ct binary will be placed in ./bin/.

Note: Review releases for new branch versions.

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