gistfile1.txt

zeal@drcid ~ $ cat /etc/systemd/system/archon.service 
[Unit]
Description=Container archon
ConditionPathExists=/var/lib/sandbox/archon

[Service]
ExecStart=/usr/bin/systemd-nspawn --boot \
                                  --quiet \
                                  --keep-unit \
                                  --directory=/var/lib/sandbox/archon \
                                  --machine archon \
                                  --network-bridge=br0
KillMode=mixed
Type=notify
RestartForceExitStatus=133
SuccessExitStatus=133

[Install]
WantedBy=multi-user.target