```sh
$ mkosi -f genkey # Generate signing keys once.
$ mkosi -f sandbox meson compile -C build mkosi # (re-)build the OS image
-$ sudo mkosi boot # Boot the image with systemd-nspawn.
+$ run0 mkosi boot # Boot the image with systemd-nspawn.
$ mkosi vm # Boot the image with qemu.
```
by mkosi, run the following:
```sh
-dnf upgrade build/mkosi.builddir/<distribution>~<release>~<architecture>/*.rpm # Fedora/CentOS
-apt-get install build/mkosi.builddir/<distribution>~<release>~<architecture>/*.deb # Debian/Ubuntu
-pacman --upgrade --needed --noconfirm build/mkosi.builddir/<distribution>~<release>~<architecture>/*.pkg.tar # Arch Linux
-zypper --non-interactive install --allow-unsigned-rpm build/mkosi.builddir/<distribution>~<release>~<architecture>/*.rpm # OpenSUSE
+run0 dnf upgrade build/mkosi.builddir/<distribution>~<release>~<architecture>/*.rpm # Fedora/CentOS
+run0 apt-get install build/mkosi.builddir/<distribution>~<release>~<architecture>/*.deb # Debian/Ubuntu
+run0 pacman --upgrade --needed --noconfirm build/mkosi.builddir/<distribution>~<release>~<architecture>/*.pkg.tar # Arch Linux
+run0 zypper --non-interactive install --allow-unsigned-rpm build/mkosi.builddir/<distribution>~<release>~<architecture>/*.rpm # OpenSUSE
```
To downgrade back to the old version shipped by the distribution, run the
following:
```sh
-dnf downgrade "systemd*" # Fedora/CentOS
+run0 dnf downgrade "systemd*" # Fedora/CentOS
# TODO: Other distributions
```