Introduction

The Build Environment will be called BE from now on.
You will need a few Gigabytes to have enough pace for kernel compiling and storing all the binary packages and iso image.

Create a build environment

We are setting up our BE in chroot.

Note: The variables below:

${build_dir} = You can name it whatever you like.
${mirror} = Should be replaced with one of the available alpine-mirrors:

Lets start by geting the latest apk static binary:

wget ${mirror}/v1.9/apk.static
chmod +x ./apk.static

We are setting up a basic chroot:

mkdir ${build_dir}
./apk.static --repo ${mirror}/v1.9/packages/core --root $PWD/${build_dir} add --initdb build-base git abuild
mkdir -p ./${build_dir}/proc
mount --bind /proc ./${build_dir}/proc

Lets setup our needed devices:

mknod -m 666 ./${build_dir}/dev/full c 1 7
mknod -m 777 ./${build_dir}/dev/null c 1 3
mknod -m 666 ./${build_dir}/dev/ptmx c 5 2
mknod -m 644 ./${build_dir}/dev/random c 1 8
mknod -m 644 ./${build_dir}/dev/urandom c 1 9
mknod -m 666 ./${build_dir}/dev/zero c 1 5
mknod -m 666 ./${build_dir}/dev/tty c 5 0

We need or dns servers and root dir:

cp /etc/resolv.conf ./${build_dir}/etc/
mkdir -p ./${build_dir}/root

We are setting up apk mirrors:

mkdir -p ./${build_dir}/etc/apk
echo "${mirror}/v1.9/packages/core" > ./${build_dir}/etc/apk/repositories
echo "${mirror}/v1.9/packages/extra" >> ./${build_dir}/etc/apk/repositories

At this point you should be able to enter your chroot:

chroot ./${build_dir} /bin/sh