32 lines
842 B
Markdown
32 lines
842 B
Markdown
# Setup a Chroot Environment
|
|
|
|
A `chroot` environment can be used to modify a system installed to a different location.
|
|
|
|
Combined with `aufs`, the technique can be used, for example, to modify a mounted ISO image.
|
|
|
|
## Setup
|
|
|
|
MNT=/mnt
|
|
mount -o bind /dev $MNT/dev
|
|
mount -o bind /dev/pts $MNT/dev/pts
|
|
mount -t proc none $MNT/proc
|
|
mount -t sysfs none $MNT/sys
|
|
cp /proc/mounts $MNT/etc/mtab
|
|
cp /etc/resolv.conf $MNT/etc/resolv.conf
|
|
chroot $MNT
|
|
|
|
`$MNT/etc/mtab` should be edited manually to correctly point to the root file system.
|
|
|
|
Umount the chroot environment:
|
|
|
|
umount $MNT/{sys,proc,dev/pts,dev}
|
|
echo > $MNT/etc/resolv.conf
|
|
rm $MNT/etc/mtab
|
|
|
|
## AUFS Overlay
|
|
|
|
Mount a writeable version of `/tmp/mnt/root` to `/tmp/mnt/rootrw`
|
|
|
|
mkdir -p /tmp/mnt/{root,rootrw,aufs}
|
|
mount -t aufs -o br:/tmp/mnt/aufs:/tmp/mnt/root none /tmp/mnt/rootrw
|