Create MachineConfigs to Configure RHCOS
Butane
"Butane (formerly the Fedora CoreOS Config Transpiler) is a tool that consumes a Butane Config and produces an Ignition Config, which is a JSON document that can be given to a Fedora CoreOS machine when it first boots." [1]
Butane is available in a container image, we can pull the latest version locally like so:
# Pull the latest release podman pull quay.io/coreos/butane:release # Run butane using standard in and standard out podman run -i --rm quay.io/coreos/butane:release --pretty --strict < your_config.bu > transpiled_config.ign # Run butane using files. podman run --rm -v /path/to/your_config.bu:/config.bu:z quay.io/coreos/butane:release --pretty --strict /config.bu > transpiled_config.ign
We can create a CLI alias to make running the Butane container much easier like so:
alias butane='podman run --rm --tty --interactive \ --security-opt label=disable \ --volume ${PWD}:/pwd --workdir /pwd \ quay.io/coreos/butane:release'
For more detailed information on how to structure your Butane file see [1]. Once created you can convert the butane config to an igntion file like so:
butane master_chrony_machineconfig.bu -o master_chrony_machineconfig.yaml butane worker_chrony_machineconfig.bu -o worker_chrony_machineconfig.yaml
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