Cloud-init image has been added.

docker/cloud-init/Dockerfile

+FROM matefarkas/xenial:base
+MAINTAINER Mate Farkas <mate.farkas@sch.hu>
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get -y update && apt-get install -y \
+  cloud-init \
+  net-tools
+
+ADD etc/mini-init /etc/mini-init
+
+ADD var/lib/cloud/seed/nocloud/meta-data /var/lib/cloud/seed/nocloud/meta-data
+ADD var/lib/cloud/seed/nocloud/user-data /var/lib/cloud/seed/nocloud/user-data
+
+EXPOSE 22
+CMD /sbin/mini-init
+

docker/cloud-init/Makefile

+TAG='matefarkas/xenial:cloud-init'
+
+all:
+	docker build --tag ${TAG} ${PWD}
+
+test:
+	docker run --interactive --tty --rm ${TAG} bash || true
+

docker/cloud-init/README.md

+# matefarkas/xenial:cloud-init
+
+Cloud-init testing with Docker and Vagrant (**NoCloud**).
+

docker/cloud-init/etc/mini-init/cloud-init

+#!/bin/bash
+
+cloud-init init
+cloud-init modules --mode final
+

docker/cloud-init/var/lib/cloud/seed/nocloud/user-data

+#!/bin/bash
+
+touch /tmp/hello_world
+