...

init.sh

 #!/bin/bash
 ln -sr vm.py /usr/bin/vm
 cp vm.service /lib/systemd/system/
+cp vm-qemu@.service /lib/systemd/system/

vm-qemu@.service

+[Unit]
+Description=qemu vm %i
+After=network.target
+
+[Service]
+
+Environment=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin:
+Environment=VM_BACKEND=qemu
+WorkingDirectory=/mnt/virtual/%i.vm
+ExecStart=/bin/sh run-qemu
+
+Restart=no
+
+
+[Install]
+WantedBy=default.target

vm.service

@@ -4,9 +4,10 @@ After=network.target
 
 [Service]
 
-Environment=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin:/home/jiri/bin
+Environment=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin:/usr/bin:/bin
+Environment=VM_BACKEND=qemu
 WorkingDirectory=/mnt/virtual
-ExecStart=/mnt/virtual/prog/vm.py server 'run_periodically 10 -- prepare_forks --base base --count 1' 'run_periodically 30 -- clean'
+ExecStart=/mnt/virtual/prog/vm.py server 'run_periodically 10 -- prepare_forks --base base --count 1' 'run_periodically 30 -- clean' 'run_periodically 30 -- pause_prepared_forks --base base --runtime 40'
 
 Restart=always
 RestartSec=10