How to Chroot

mount /dev/sda3 /mnt
mount -t proc /proc /mnt/proc
mount --rbind /sys /mnt/sys
mount --make-rslave /mnt/sys
mount --rbind /dev /mnt/dev
mount --make-rslave /mnt/dev
chroot /mnt /bin/zsh
. /etc/profile

umount -l /mnt/dev{/shm,/pts,}
umount -R /mnt