05-13-2016
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 126G 0 disk
\u251c\u2500xvda1 202:1 0 102M 0 part /boot
\u251c\u2500xvda2 202:2 0 16G 0 part /
\u2514\u2500xvda3 202:3 0 109.9G 0 part
[root@localhost ~]#
[root@localhost ~]# cat /proc/partitions
major minor #blocks name
202 0 132120576 xvda
202 1 104448 xvda1
202 2 16778240 xvda2
202 3 115236864 xvda3
[root@localhost ~]#
[root@localhost ~]# fdisk -l
Disk /dev/xvda: 135.3 GB, 135291469824 bytes
64 heads, 32 sectors/track, 129024 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b91c5
Device Boot Start End Blocks Id System
/dev/xvda1 * 2 103 104448 83 Linux
/dev/xvda2 104 16488 16778240 8e Linux LVM
/dev/xvda3 16489 129024 115236864 8e Linux LVM
[root@localhost ~]#
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 16G 5.3G 9.8G 36% /
tmpfs 1.4G 0 1.4G 0% /dev/shm
/dev/xvda1 99M 72M 23M 77% /boot
[root@localhost ~]#
[root@localhost ~]# mount
/dev/xvda2 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/xvda1 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@localhost ~]#
[root@localhost ~]# pvs
[root@localhost ~]#
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LEARN ABOUT REDHAT
pivot_root
PIVOT_ROOT(8) Maintenance Commands PIVOT_ROOT(8)
NAME
pivot_root - change the root file system
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 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 (see below; note the absence of leading slashes to make it work whether pivot_root has changed the shell's
root or not).
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), umount(8)
Linux Feb 23, 2000 PIVOT_ROOT(8)