NAME<\/a> pivot_root \u2212 change the root filesystem<\/p>\n pivot_root<\/b> new_root put_old<\/i><\/p>\n pivot_root<\/b><\/i> moves the root file system of the current process to the directory put_old<\/i> and makes new_root<\/i> the new root file system. Since pivot_root<\/b>(8) simply calls pivot_root<\/b>(2), we refer to the man page of the latter for further details.<\/p>\n Note that, depending on the implementation of pivot_root<\/b>, root and cwd of the caller may or may not change. The following is a sequence for invoking pivot_root<\/b> that works in either case, assuming that pivot_root<\/b> and chroot<\/b> are in the current PATH<\/b>:<\/p>\n cd new_root<\/i> Note that chroot<\/b> must be available under the old root and under the new root, because pivot_root<\/b> may or may not have implicitly changed the root directory of the shell.<\/p>\n Note that exec chroot<\/b> changes the running executable, which is necessary if the old root directory should be unmounted afterwards. Also note that standard input, output, and error may still point to a device on the old root file system, keeping it busy. They can easily be changed when invoking chroot<\/b> (see below; note the absence of leading slashes to make it work whether pivot_root<\/b> has changed the shell\u2019s root or not).<\/p>\n \u2212V<\/b>, \u2212\u2212version<\/b><\/p>\n Display version information and exit.<\/p>\n \u2212h<\/b>, \u2212\u2212help<\/b><\/p>\n Display help text and exit.<\/p>\n Change the root file system to \/dev\/hda1 from an interactive shell:<\/p>\n mount \/dev\/hda1 \/new-root Mount the new root file system over NFS from 10.0.0.1:\/my_root and run init<\/b>:<\/p>\n ifconfig lo 127.0.0.1 up # for portmap
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
EXAMPLE<\/a>
SEE ALSO<\/a>
AVAILABILITY<\/a> <\/p>\n
\nNAME <\/a> <\/h2>\n
SYNOPSIS <\/a> <\/h2>\n
DESCRIPTION <\/a> <\/h2>\n
pivot_root . put_old<\/i>
exec chroot . command<\/i><\/p>\nOPTIONS <\/a> <\/h2>\n
EXAMPLE <\/a> <\/h2>\n
cd \/new-root
pivot_root . old-root
exec chroot . sh
umount \/old-root<\/p>\n
# configure Ethernet or such
portmap # for lockd (implicitly started by mount)
mount \u2212o ro 10.0.0.1:\/my_root \/mnt
killall portmap # portmap keeps old root busy
cd \/mnt
pivot_root . old_root
exec chroot . sh \u2212c \u2019umount \/old_root; exec \/sbin\/init\u2019
SEE ALSO <\/a> <\/h2>\n