PIVOT_ROOT(8) System Administration PIVOT_ROOT(8) NAME pivot_root - change the root filesystem SYNOPSIS pivot_root new_root put_old DESCRIPTION pivot_root moves the root file system of the current process to the directory put_old and makes new_root the new root file system. Since pivot_root(8) simply calls pivot_root(2), we refer to the man page of the latter for further details. Note that, depending on the implementation of pivot_root, root and cwd of the caller may or may not change. The following is a sequence for invoking pivot_root that works in either case, assuming that pivot_root and chroot are in the current PATH: cd new_root pivot_root . put_old exec chroot . command Note that chroot must be available under the old root and under the new root, because pivot_root may or may not have implicitly changed the root directory of the shell. Note that exec chroot changes the running executable, which is neces- sary 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 (see below; note the absence of leading slashes to make it work whether pivot_root has changed the shell's root or not). OPTIONS -V, --version Display version information and exit. -h, --help Display help text and exit. EXAMPLES Change the root file system to /dev/hda1 from an interactive shell: mount /dev/hda1 /new-root cd /new-root pivot_root . old-root exec chroot . sh <dev/console >dev/console 2>&1 umount /old-root Mount the new root file system over NFS from 10.0.0.1:/my_root and run init: ifconfig lo 127.0.0.1 up # for portmap # configure Ethernet or such portmap # for lockd (implicitly started by mount) mount -o ro 10.0.0.1:/my_root /mnt killall portmap # portmap keeps old root busy cd /mnt pivot_root . old_root exec chroot . sh -c 'umount /old_root; exec /sbin/init' \ <dev/console >dev/console 2>&1 SEE ALSO chroot(1), mount(8), pivot_root(2), switch_root(8), umount(8) AVAILABILITY The pivot_root command is part of the util-linux package and is avail- able from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux August 2011 PIVOT_ROOT(8)
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