OEM configuration

There are several way to customize Elemental and a elemental-toolkit derivative:

• declaratively in runtime with cloud-config file (by overriding, or extending)
• stateful, embedding any configuration in the container image to be booted.

For runtime persistence configuration, the only supported way is with cloud-config files, see the relevant docs.

A derivative automatically loads and executes cloud-config files during the various system stages also inside /system/oem which is read-only and reserved to the system.

Derivatives that wish to override default configurations can do that by placing extra cloud-init file, or overriding completely /system/oem in the target image.

This is to setup for example, the default root password or the preferred upgrade channel.

The following are the Elemental default oem files, which are shipped within the cloud-config-defaults and cloud-config-essentials features:

/system/oem/00_rootfs.yaml - defines the rootfs mountpoint layout setting
/system/oem/01_defaults.yaml - systemd defaults (keyboard layout, timezone)
/system/oem/02_upgrades.yaml - Settings for Elemental vanilla channel upgrades
/system/oem/03_branding.yaml - Branding setting, Derivative name, /etc/issue content
/system/oem/04_accounting.yaml - Default user/pass
/system/oem/05_network.yaml - Default network setup
/system/oem/06_recovery.yaml - Executes additional commands when booting in recovery mode

You can either override the above files, or alternatively not consume the above features while building a derivative.