How to make a custom ISO image

This document explains how to build a custom ISO image using the alpine-iso scripts.

First make sure we have the needed tools

apk add alpine-sdk

Then we clone (or update) the alpine-iso git repository.

git clone git://git.alpinelinux.org/alpine-iso

The alpine-iso scripts is a simple makefile which you need to feed with a <name>.conf.mk file and a <name>.packages.

In the <name>.conf.mk we specify

ALPINE_NAME

name of iso image

ALPINE_VERSION

(optional) version string. Will default to todays date.

KERNEL_FLAVOR

(opional) either grsec, vserver or pae. Will default to grsec.

MODLOOP_EXTRA

(optional) Extra kernel module packages for the modloop image. For example: dahdi-linux-vserver

The <name>.packages is just a plaintext list of packages that should be included in the iso. You should always add alpine-base in there or the CD migh not be able to boot. The dependencies for the packages will automatically be pulled in.

A rescue CD example

As an example, let us make a rescue ISO with packages needed for rescue operations. We call it alpine-rescue

We create the alpine-rescue.conf.mk as follows:

ALPINE_NAME := alpine-rescue
KERNEL_FLAVOR := grsec
MODLOOP_EXTRA :=

And then the alpine-rescue.packages as:

alpine-base
bkeymaps
openssh
e2fsprogs
mdadm
lvm2
parted
debootstrap
ntfs-3g

Tip: If you have home-built apk's that you would like to include in the iso you are about to create:

Make sure your developer keys are placed in /etc/apk/keys/

Learn apk-tools to find your home-built apk's:

echo "~/.cache/apks" >> /etc/apk/repositories

Make sure the apk index is up to date (so apk finds the packages):

apk update

We create the ISO image by telling the makefile the profile name. The makefile target is iso.

make PROFILE=alpine-rescue iso

To generate the sha1 sum we use the sha1 make target.

make PROFILE=alpine-rescue sha1