[CentOS] Running script before reboot or shutdown

On Tue, Dec 22, 2020, at 10:50, Carlos Lopez wrote:
> Thanks centos2 .... but regarding your example, I cannot see where you configure that this services needs to be stopped before anyone else....

I conveniently overlooked that requirement. I'll have to get back to you on that...


> On 22/12/20, 15:22, "CentOS on behalf of centos2 at foxengines.net" <centos-bounces at centos.org on behalf of centos2 at foxengines.net> wrote:
> 
>     Hi,
> 
>     On Tue, Dec 22, 2020, at 06:51, Carlos Lopez wrote:
>     > I am trying to configure a script as a systemd service to run first when a shutdown or reboot is called. This script execute some scp commands to copy some files to other machines. My actual defined systemd’s file is:
>     > 
>     > [Unit]
>     > Description=Remote copy some files before reboot/shutdown
>     > Before=poweroff.target halt.target shutdown.target reboot.target
>     > DefaultDependencies=no
>     > 
>     > [Service]
>     > Type=simple
>     > ExecStart=/bin/true
>     > ExecStop=/usr/local/bin/remote_copy
>     > RemainAfterExit=yes
>     > 
>     > [Install]
>     > WantedBy=multi-user.target
>     > 
>     > But it doesn’t work. “remote_copy” is working when it is executed from root shell. I am using CentOS-8 fully patched release.
>     > 
>     > Any idea what am I doing wrong?
> 
>     I don't have a CentOS 8 machine to test on but on a CentOS 7.9, this works for me:
> 
>     /etc/systemd/system/shutdown-test.service
> 
>     ------------------------------------------------------
>     [Unit]
>     Description=Remote copy some files before reboot/shutdown
> 
>     [Service]
>     Type=oneshot
>     ExecStart=/bin/true
>     ExecStop=/usr/local/bin/remote_copy
>     RemainAfterExit=true
> 
>     [Install]
>     WantedBy=multi-user.target
>     ------------------------------------------------------
> 
>     the mode and contents of remote_copy:
> 
>     -rwxr-xr-x 1 root root 44 Dec 22 08:23 /usr/local/bin/remote_copy
> 
>     ------------------------------------------------------
>     #!/bin/bash
> 
>     date >> /tmp/remote_copy_result
>     ------------------------------------------------------
> 
>     After enabling the service and rebooting, I get a file in /tmp/remote_copy_result that contains the date.
> 
>     My success is attributable not to me but to this post:
>     https://unix.stackexchange.com/questions/39226/how-to-run-a-script-with-systemd-right-before-shutdown
>     Your unit file seems similar but when I used it, it didn't work on my CentOS 7.9 system either.
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