Making scripts run at boot time with Debian

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本文介绍在Debian系统中如何通过编辑init.d脚本来添加新的服务，并在系统启动时自动运行该服务的方法。通过使用update-rc.d命令创建相应的符号链接，可以轻松实现服务的开机启动与关闭。

Posted by Steve on Mon 11 Oct 2004 at 13:01

Tags: boot, debian-specific commands, initscripts, scheduling

Debian uses a Sys-V like init system for executing commands when the system runlevel changes - for example at bootup and shutdown time.

If you wish to add a new service to start when the machine boots you should add the necessary script to the directory /etc/init.d/. Many of the scripts already present in that directory will give you an example of the kind of things that you can do.

Here's a very simple script which is divided into two parts, code which always runs, and code which runs when called with "start" or "stop".

#! /bin/sh
# /etc/init.d/blah
#

# Some things that run always
touch /var/lock/blah

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting script blah "
    echo "Could do more here"
    ;;
  stop)
    echo "Stopping script blah"
    echo "Could do more here"
    ;;
  *)
    echo "Usage: /etc/init.d/blah {start|stop}"
    exit 1
    ;;
esac

exit 0

Once you've saved your file into the correct location make sure that it's executable by running "chmod 755 /etc/init.d/blah".

Then you need to add the appropriate symbolic links to cause the script to be executed when the system goes down, or comes up.

The simplest way of doing this is to use the Debian-specific command update-rc.d:

root@skx:~# update-rc.d blah defaults
 Adding system startup for /etc/init.d/blah ...
   /etc/rc0.d/K20blah -> ../init.d/blah
   /etc/rc1.d/K20blah -> ../init.d/blah
   /etc/rc6.d/K20blah -> ../init.d/blah
   /etc/rc2.d/S20blah -> ../init.d/blah
   /etc/rc3.d/S20blah -> ../init.d/blah
   /etc/rc4.d/S20blah -> ../init.d/blah
   /etc/rc5.d/S20blah -> ../init.d/blah

If you wish to remove the script from the startup sequence in the future run:

root@skx:/etc/rc2.d# update-rc.d -f  blah remove
update-rc.d: /etc/init.d/blah exists during rc.d purge (continuing)
 Removing any system startup links for /etc/init.d/blah ...
   /etc/rc0.d/K20blah
   /etc/rc1.d/K20blah
   /etc/rc2.d/S20blah
   /etc/rc3.d/S20blah
   /etc/rc4.d/S20blah
   /etc/rc5.d/S20blah
   /etc/rc6.d/K20blah

This will leave the script itself in place, just remove the links which cause it to be executed.

You can find more details of this command by running "man update-rc.d".