Home / ubuntu / Questions / 913010
Accepted
Philipp Claßen
Asked: 2017-05-09 03:03:23 +0800 CST

Running a script at the begin of the shutdown protocol (not at the end)?

  • 772

Is it possible to run a script before the shutdown? That means at a point where the system is still fully functional.

I tried to put my shutdown script in /lib/systemd/system-shutdown/test-script. It will be executed but from my understanding it is only executed immediately before the shutdown takes place. For instance, the disk is already mounted in read-only mode. This can be fixed, but wrapping the script with:

#!/bin/bash
mount -oremount,rw /
... do something ...
mount -oremount,ro /

What I require and cannot get to work, though, is internet connection. When the script is executed, the internet connection seems to be no longer available.

Is it possible to run a script right at the begin of the shutdown protocol?

I'm testing with Ubuntu 16.04.

16.04

2 Answers

  1. Best Answer

    I found the answer on https://unix.stackexchange.com/q/39226/29509.

    To sum it up, this solution works for me (on Ubuntu 16.04):

    Create a file /etc/systemd/system/my-cleanup.service:

    [Unit]
Description=Test cleanup at shutdown

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/bin/true
ExecStop=/path/to/my-cleanup-script.sh

[Install]
WantedBy=multi-user.target

    (Assuming the shutdown script is available under /path/to/my-cleanup-script.sh and is executable.)

    Finally, enable the systemd service via:

    sudo systemctl enable my-cleanup.service
sudo systemctl start my-cleanup.service
    • 0

  2. With respect to Answer 1. I trust the solution will work "during" shutdown but as the OP asked it will run right at the begin of the shutdown, I am not sure.
    This link is more explicit about the moment a script will be executed during shutdown: http://ccm.net/faq/3348-execute-a-script-at-startup-and-shutdown-on-ubuntu
    Please note I did not test it in my system, I'm just relaying my findings.

    • 0