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.\&quot;     Title: dracut-shutdown.service
.\&quot;    Author: [see the &quot;AUTHORS&quot; section]
.\&quot; Generator: DocBook XSL Stylesheets vsnapshot &lt;http://docbook.sf.net/&gt;
.\&quot;      Date: 07/15/2025
.\&quot;    Manual: dracut
.\&quot;    Source: dracut
.\&quot;  Language: English
.\&quot;
.TH &quot;DRACUT\-SHUTDOWN\&amp;.S&quot; &quot;8&quot; &quot;07/15/2025&quot; &quot;dracut&quot; &quot;dracut&quot;
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.\&quot; * Define some portability stuff
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.\&quot; http://bugs.debian.org/507673
.\&quot; http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\&quot; * set default formatting
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.\&quot; * MAIN CONTENT STARTS HERE *
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.SH &quot;NAME&quot;
dracut-shutdown.service \- unpack the initramfs to /run/initramfs
.SH &quot;SYNOPSIS&quot;
.sp
dracut\-shutdown\&amp;.service
.SH &quot;DESCRIPTION&quot;
.sp
This service unpacks the initramfs image to /run/initramfs\&amp;. systemd pivots into /run/initramfs at shutdown, so the root filesystem can be safely unmounted\&amp;.
.sp
The following steps are executed during a shutdown:
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
systemd switches to the shutdown\&amp;.target
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
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systemd starts /lib/systemd/system/shutdown\&amp;.target\&amp;.wants/dracut\-shutdown\&amp;.service
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
dracut\-shutdown\&amp;.service executes /usr/lib/dracut/dracut\-initramfs\-restore which unpacks the initramfs to /run/initramfs
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
systemd finishes shutdown\&amp;.target
.RE
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.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
systemd kills all processes
.RE
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.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
systemd tries to unmount everything and mounts the remaining read\-only
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
systemd checks, if there is a /run/initramfs/shutdown executable
.RE
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.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
if yes, it does a pivot_root to /run/initramfs and executes \&amp;./shutdown\&amp;. The old root is then mounted on /oldroot\&amp;. /usr/lib/dracut/modules\&amp;.d/99shutdown/shutdown\&amp;.sh is the shutdown executable\&amp;.
.RE
.sp
.RS 4
.ie n \{\
\h&#039;-04&#039;\(bu\h&#039;+03&#039;\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
shutdown will try to umount every /oldroot mount and calls the various shutdown hooks from the dracut modules
.RE
.sp
This ensures, that all devices are disassembled and unmounted cleanly\&amp;.
.sp
To debug the shutdown process, you can get a shell in the shutdown procedure by injecting &quot;rd\&amp;.break=pre\-shutdown rd\&amp;.shell&quot; or &quot;rd\&amp;.break=shutdown rd\&amp;.shell&quot;\&amp;.
.sp
.if n \{\
.RS 4
.\}
.nf
# mkdir \-p /run/initramfs/etc/cmdline\&amp;.d
# echo &quot;rd\&amp;.break=pre\-shutdown rd\&amp;.shell&quot; &gt; /run/initramfs/etc/cmdline\&amp;.d/debug\&amp;.conf
# touch /run/initramfs/\&amp;.need_shutdown
.fi
.if n \{\
.RE
.\}
.sp
In case the unpack of the initramfs fails, dracut\-shutdown\-onfailure\&amp;.service executes to make sure switch root doesn\(cqt happen, since it would result in switching to an incomplete initramfs\&amp;.
.SH &quot;AUTHORS&quot;
.sp
Harald Hoyer
.SH &quot;SEE ALSO&quot;
.sp
\fBdracut\fR(8)
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