Update service in a better way

[nicolas-brousse]

Check if a restart could be done instead a stop/start for updated services.

• Does configuration like Environment will be applied?
• Does restart stop by sending a signal to the process ID? In this case no matters if command is not the same.

[nicolas-brousse]

Looks like systemctl restart do a stop an kill -TERM if no ExecStop instruction is set onto the systemd service.
But if we restart we have to systemctl daemon-reload between systemd service replacement and system restart