Let's say you want a kernel argument like memmap='1G$12G' to preallocate 1GiB of RAM starting from the 12GiB mark for later use e.g. for a DMA device. If you are on a rpm-ostree based system like Fedora Silverblue (Fedora Atomic Desktop) you might try this:
rpm-ostree kargs --append="memmap='1G$12G'"Then you notice:
One sec I have to escape the $ sign since else it would treat the 1 as variable.
Creating and starting a VM from inside a container is really nice if for example you want to automatically test if you OS installs correctly inside a CI.
This example container image uses systemd inside podman to make this possible. It's based on the following tutorial: https://developers.redhat.com/blog/2019/04/24/how-to-run-systemd-in-a-container
Sadly this only works for podman and not for docker since podman auto-mounts all required paths if you set the container CMD to /sbin/init.
For this create the following two files:
.
├── Dockerfile