# Linux Kernel Module Cheat

##### 38.15.4.1. `out_rootfs_overlay_dir`

This path can be found with:

    ./getvar out_rootfs_overlay_dir

This output directory contains all the files that LKMC will put inside the final image, including for example:

- Userland content that needs to be compiled

- rootfs_overlay content that gets put inside the image as is

LKMC first collects all the files that it will dump into the guest there, and then in the very last step dumps everything into the final image.

In Buildroot, this is done by pointing `BR2_ROOTFS_OVERLAY` to that directory, which is documented at: https://buildroot.org/downloads/manual/manual.html#rootfs-custom

This does not include native image modification mechanisms such as Buildroot packages, which we let Buildroot itself manage.

- <code>disk_image_2</code>