Man page - switch_root(8)
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apt-get install util-linux
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SWITCH_ROOT
NAMESYNOPSIS
DESCRIPTION
OPTIONS
EXIT STATUS
NOTES
AUTHORS
SEE ALSO
REPORTING BUGS
AVAILABILITY
NAME
switch_root - switch to another filesystem as the root of the mount tree
SYNOPSIS
switch_root [ -hV ]
switch_root newroot init [ arg ...]
DESCRIPTION
switch_root moves already mounted /proc , /dev , /sys and /run to newroot and makes newroot the new root filesystem and starts init process.
WARNING: switch_root removes recursively all files and directories on the current root filesystem.
OPTIONS
-h , --help
Display help text and exit.
-V , --version
Display version and exit.
EXIT STATUS
switch_root returns 1 on failure, it never returns on success.
NOTES
switch_root will fail to function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet this requirement then you can first use a bind-mounting trick to turn any directory into a mount point:
mount --bind $DIR $DIR
AUTHORS
Peter Jones <pjones@redhat.com>, Jeremy Katz <katzj@redhat.com>, Karel Zak <kzak@redhat.com>
SEE ALSO
chroot (2), init (8), mkinitrd (8), mount (8)
REPORTING BUGS
For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>.
AVAILABILITY
The switch_root command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.