Script with gidelines for a 32bit chroot inside a amd64 os.

chroot-in.sh

#!/bin/bash                                                                          
# http://www.gentoo.org/proj/en/base/amd64/howtos/chroot.xml                         
USER=jmonteagudo
CHROOT=/chroot/precise-32

# mount the usual suspects                                                           
mount -o bind /tmp $CHROOT/tmp/
mount -t proc proc $CHROOT/proc/
mount -t sysfs sys $CHROOT/sys/
mount -o bind /dev $CHROOT/dev/
mount -t devpts pts $CHROOT/dev/pts/

# replicate network & time settings                                                  
cp -pf /etc/resolv.conf $CHROOT/etc/
cp -pf /etc/hosts $CHROOT/etc
cp -Ppf /etc/localtime $CHROOT/etc

# mount development directory                                                        
mount --bind /home/$USER/dev $CHROOT/home/$USER/dev/

# chroot like this is a 32 bit system                                                
linux32 chroot $CHROOT/ /bin/bash

# clean up after exit                                                                
umount $CHROOT/home/$USER/dev/
umount $CHROOT/dev/pts/
umount $CHROOT/dev/
umount $CHROOT/sys/
umount $CHROOT/proc/
umount $CHROOT/tmp/