New in libguestfs ≥ 1.23.11 is support for reading the systemd journal from a guest.
The support is rudimentary at the moment. It would be nice to have a guestfish
journal command for easy browsing of the journal (somewhat like journalctl), but we’re not there yet.
You can use journalctl from guestfish (this is true even without the journal APIs that I just added), but it involves downloading the whole journal first so it’s rather slow:
><fs> copy-out /var/log/journal /tmp ><fs> ! journalctl -D /tmp/journal