Kernel Module Builder

Provides an example of a multi-container application with a service that builds an out-of-tree kernel module, loads it and runs it alongside an example service.

• The load service builds the kernel module source located in module/src using module headers provided for balena devices using a multi-stage build and then loads the kernel module.

• The check service runs a simple entry script that checks for the output of the example module and depends on the load service above.

Usage

This project is prepared to build in the balenaCloud builders. To use it as is install the balenaCLI and build with:

balena push <fleet>

The device type will be automatically retrieved from the specified fleet.

Customization

• Replace the OS_VERSION argument in the load service in the docker-compose.yml file to match the balenaOS version of the target device.

• Replace the contents of the module/src directory with the module source to build.

• Replace the check service by your own service.

• Optionally, kernel header files can be provided under module/kernel-module-headers.tar.gz. This is only required for private device types that do not have the header files publicly available.