This document explains how to set up an Alpine build environment in a chroot under a different Linux distro, such as Arch, Debian, Fedora, Gentoo, or Ubuntu. Once inside the chroot environment, you can build, debug, and run alpine packages. The guide can also be used to install Alpine Linux from a non-Alpine Linux livecd such as Ubuntu or System rescue CD.

This example installation of Alpine Linux in a chroot will work with the lastest release. But it's also possible to make a chroot with edge or older releases of Alpine Linux to test backports.

You can also use script alpine-chroot-install that simplifies this process to just two commands. This script is useful especially on CI environment (e.g. Travis CI).

la partition /etc/mtab n'est pas renseignée.

pour se faire :
grep -v rootfs /proc/mounts > /etc/mtab

et ensuite supprimé dans /etc/mtab tout ce qui passe en erreur dans df :)