Answer by Zoredache for systemd: how can I run a script on start of a service, without editing the service definition

If you use systemd edit servicename.service you can apply local overrirdes to things in the unit. For your request you might want to adjust these values.

[Service]ExecStartPre=beforestuffExecStopPost=afterstuff

If you override using the edit command the changes will probably get saved to /etc/systemd/system/servicename.service.d/override.conf.

Links:

• https://www.freedesktop.org/software/systemd/man/systemd.service.html
• https://askubuntu.com/questions/659267/how-do-i-override-or-configure-systemd-services