core-admin/linux/systemd/qubes-netvm.service

[Unit]
Description=Qubes NetVM startup
After=qubes-core.service qubes-qmemman.service

[Service]
Type=oneshot
Group=qubes
Environment=DISPLAY=:0
RemainAfterExit=yes
KillMode=none
ExecStart=/bin/sh -c 'NETVM=`qubes-prefs --get default-netvm`; [ -n "$NETVM" ] && qvm-start -q --no-guid $NETVM'

[Install]
WantedBy=multi-user.target
# Cover legacy init.d script
Alias=qubes_netvm.service