[systemd-devel] Help with running a script at shutdown and make it run first before other services

[Andrei Borzenkov]

07.12.2024 01:16, David Elie-Dit-Cosaque wrote:
> Hi All,
> 
> I am trying to create a systemd service that would execute a script at
> shutdown before any other services start receiving shutdown notifications.

You could try

mkdir -p /etc/systemd/system/-.service.d
cat > /etc/systemd/system/-.service.d/after-my-service.conf << EOF
[Unit[
After=my.service
EOF

> I came up with this:
> 
> [Service]
> Type=oneshot
> RemainAfterExit=true
> ExecStart=/usr/bin/true
> ExecStop=/usr/local/bin/myscript.sh
> [Install]
> WantedBy=multi-user.target
> 
> The script does run after shutdown is initiated but since it relies on
> other services which are also shutting down, it fails. Is there a way to
> order the shutdown so that  myscript.sh is completed first before
> continuing with the shutdown?
> 
> Thanks!
> David.
>