I needed to test something and was only interested in the logs since the last start/restart of a service. For this, you can use the systemd invocation id from a systemd service.
You can check the current systemd invocation id like so:
systemctl show -p InvocationID --value kubelet.service
Then just use the
_SYSTEMD_INVOCATION_ID option in
journalctl to only see logs from the last service start:
journalctl -u kubelet.service _SYSTEMD_INVOCATION_ID="$(systemctl show -p InvocationID --value kubelet.service)"