CoreOS Container Linux Logo

A container-focused OS that's designed for painless management in large clusters

Distribution via Config Drive

NOTE: coreos-cloudinit is no longer under active development and has been superseded by Ignition. For more information about the recommended tools for provisioning Container Linux, refer to the provisioning documentation.

CoreOS supports providing configuration data via config drive disk images. Currently only providing a single script or cloud config file is supported.

Contents and Format

The image should be a single FAT or ISO9660 file system with the label config-2 and the configuration data should be located at openstack/latest/user_data.

For example, to wrap up a config named user_data in a config drive image:

mkdir -p /tmp/new-drive/openstack/latest
cp user_data /tmp/new-drive/openstack/latest/user_data
mkisofs -R -V config-2 -o configdrive.iso /tmp/new-drive
rm -r /tmp/new-drive

If on OS X, replace the mkisofs invocation with:

hdiutil makehybrid -iso -joliet -default-volume-name config-2 -o configdrive.iso /tmp/new-drive

QEMU virtfs

One exception to the above, when using QEMU it is possible to skip creating an image and use a plain directory containing the same contents:

qemu-system-x86_64 \
    -fsdev local,id=conf,security_model=none,readonly,path=/tmp/new-drive \
    -device virtio-9p-pci,fsdev=conf,mount_tag=config-2 \
    [usual qemu options here...]