CentOS - Dec 2020 - Running script before reboot or shutdown

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.

Thanks centos2 .... but regarding your example, I cannot see where you configure
that this services needs to be stopped before anyone else....


?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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