An eaxmpel of what pivot_root syscall does

gistfile1.txt

before:

109 108 202:1 / / rw,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered
131 109 0:3 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
133 131 0:33 / /proc/sys/fs/binfmt_misc rw,relatime - binfmt_misc binfmt_misc rw
134 109 202:16 / /media/bulk rw,relatime - ext4 /dev/xvdb rw,data=ordered
135 109 202:1 /tmp/sio2jail-tZd8KB /tmp/sio2jail-tZd8KB rw,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered
136 135 202:1 /home/users/wolf480/sio2jail/bin/boxes/compiler-python3.5.3_i386 /tmp/sio2jail-tZd8KB ro,nosuid,nodev,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered

before (human-readable):

108
 \_109 /                            202:1  /
    \_131 /proc                       0:3  /
    |  \_133 /proc/sys/fs/binfmt_misc 0:33 /
    \_134 /media/bulk               202:16 /
    \_135 /tmp/sio2jail-tZd8KB      202:1  /tmp/sio2jail-tZd8KB
       \_136 /tmp/sio2jail-tZd8KB   202:1  /home/users/wolf480/sio2jail/bin/boxes/compiler-python3.5.3_i386


after:

109 136 202:1 / / rw,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered
131 109 0:3 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
133 131 0:33 / /proc/sys/fs/binfmt_misc rw,relatime - binfmt_misc binfmt_misc rw
134 109 202:16 / /media/bulk rw,relatime - ext4 /dev/xvdb rw,data=ordered
135 109 202:1 /tmp/sio2jail-tZd8KB /tmp/sio2jail-tZd8KB rw,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered
136 108 202:1 /home/users/wolf480/sio2jail/bin/boxes/compiler-python3.5.3_i386 / ro,nosuid,nodev,relatime - ext4 /dev/xvda1 rw,errors=remount-ro,data=ordered
137 136 0:34 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw

after (human readable):

108
 \_136 / 202:1 /home/users/wolf480/sio2jail/bin/boxes/compiler-python3.5.3_i386
    \_137 /proc 0:34 /
    \_109 / 202:1 /
       \_131 /proc 0:3 /
       |  \_133 /proc/sys/fs/binfmt_misc 0:33 /
       \_134 /media/bulk 202:16 /
       \_135 /tmp/sio2jail-tZd8KB 202:1 /tmp/sio2jail-tZd8KB