This documents my upgrade process to the Alpine 3.0 tree from Alpine 2.8 tree. In reality, they are the same tree, but with different build parameters... specifically Alpine 3.0 uses Musl and Alpine 2.8 does not. Alpine 2.8 is also the last planned release series featuring uClibc.
The first step is to make sure you are using a modern apk-tools. Upgrade your system to 2.8 development (
you've not done so already. Then install the static-linked version of apk-tools:
Now modify your
/etc/apk/repositories file to use the
edge-musl repository. I recommend using this URL, but I
may be biased:
http://mirrors.centarra.com/alpine/edge-musl/main @testing http://mirrors.centarra.com/alpine/edge-musl/testing
Now do the actual upgrade. We're going to use some flags that are not typically used, but are necessary to pivot the system safely into the new libc environment.
You are now running Musl, but you probably noticed that your configs for
mkinitfs are wrong. Lets fix that and then
reinstall the kernel package.
/etc/mkinitfs/files.d/base to contain these lines:
/bin/busybox /bin/sh /lib/libcrypto.* /lib/libz.* /lib/ld*-musl*.so* /lib/mdev /sbin/apk /etc/modprobe.d/*.conf /etc/mdev.conf
Now we just reinstall the kernel package:
Voila. We can now reboot and be purely on Musl.