PIVOT_ROOT(8) PIVOT_ROOT(8) pivot_root - pivot_root new_root put_old pivot_root put_old new_root . pivot_root(8) pivot_root(2) . pivot_root . pivot_root pivot_root chroot PATH : cd new_root pivot_root . put_old exec chroot . command chroot pivot_root . exec chroot . . chroot ( pivot_root ). -h --help . -V --version . /dev/hda1 : mount /dev/hda1 /new-root cd /new-root pivot_root . old-root exec chroot . sh dev/console 2>&1 umount /old-root NFS 10.0.0.1:/my_root init: ifconfig lo 127.0.0.1 up # for portmap # Ethernet portmap # lockd ( ) mount -o ro 10.0.0.1:/my_root /mnt killall portmap # portmap cd /mnt pivot_root . old_root exec chroot . sh -c 'umount /old_root; exec /sbin/init' \ dev/console 2>&1 chroot(1) pivot_root(2) mount(8) switch_root(8) umount(8) . pivot_root util-linux . util-linux 2.42.1 2026-05-18 PIVOT_ROOT(8)