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cloud-init has cc_growpart module (which is configured by default) responsible
for resize image according to the size of the configured for an instance flavour.

however that functionality does not work because:

1. cc_growpart module ( /usr/lib/python2.7/site-packages/cloudinit/config/cc_growpart.py )
   depends on /dev/block/ device links which should be created by udev.
2. nor udev or eudev daemons supplied by alpine packages create the links with default configuration
3. growpart script ( part of https://launchpad.net/cloud-utils ) which do the actual resize work is
   not supplied for alpine.

there are several ways to fix the issue. here is one of it:

1. patch cc_growpart.py with the provided in attach patch to get a rid of udev dependency
2. add growpart script to the cloud-init package. can be downloaded from
   http://bazaar.launchpad.net/~cloud-utils-dev/cloud-utils/trunk/download/head:/growpart-20110225134600-d84xgz6209r194ob-1/growpart
   the script have to be placed to /usr/bin
3. patch growpart with the provided in attach patch. yes, it will not work without it :)
4. add dependencies on sfdisk and parted packages to cloud-init. well, i know it do the same but i have no intentions
   to rewrite and maintain growpart script.

i have tested the provided way and it’s working.

(from redmine: issue id 6128, created on 2016-09-09)

• Uploads:
  • cc_growpart.py.patch
  • growpart.patch