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Dang Thien Nguyen
Asked: 2020-05-27 01:26:18 +0800 CST

Does Reboot command invoke scripts in /etc/rc0.d/ directory?

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I need to kill some services when shutdown/reboot my Linux server, but I am not sure how Reboot command works.

To my understanding, /etc/rc0.d/ scripts will be invoked when system is shutdown, while the /etc/rc6.d/ scripts will be invoked when system is rebooted.

But according to this link: https://linux.die.net/man/8/reboot, reboot command also call shutdown command except when running on level 0 and 6, so does this mean /etc/rc0.d/ scripts are also invoked when reboot command is run ?

Do I only need to put the service kill script into /etc/rc0.d/ and /etc/rc1.d/ ? Or does it also need to be in /etc/rc6.d/ to make sure the service is stopped when reboot ?

Edit: Add my server configuration. Currently running Redhat, varying from 6.x to 7.2.

scripts shutdown reboot runlevel

1 Answers

  1. If you just want to kill some processes the way you want when you're shutting down , you can write two simple scripts as follows :

    #Shutdown.sh
killall blah blah blah
init  0

    and

    #Reboot.sh
killall blah blah blah
init 6

    and make some aliases in the .bashrc file of each user you log-in as :

    alias shutdown_custom="Shutdown.sh"
alias reboot_custom="Reboot.sh"

    and run those commands each time you want to reboot ( or shutdown)

    But if you insist to use a init script , you can put your script in the /etc/init.d directory and issue the following command (with super-user permission) :

    update-rc.d script-name enable 0 6

    But be aware that you should mention the runlevels in the header of your script . For example this can be found for most linux services :

    # Default-Start:     2 3 4 5
# Default-Stop:      0 1 6

    In my system the contents of /etc/rc0.d and /etc/rc6.d is exactly the same , so looks like shutting down and rebooting is the same from the systemd's perspective.

    If anybody has a better solution I'm glad to hear.

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