Docker in name is no longer needed

horizon/Dockerfile

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+# Build keystone. It needs to be run with
+# --add-host=mariadb:<ip mariadb listens tp>
+# Wen starting with an initialized db,
+# run keystone-manage db_sync from this docker first:
+# $ docker run hpc/keystone --add-host=mariadb:<ip mariadb> "keystone-manage db_sync"
+
+FROM ubuntu:16.04
+
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5EDB1B62EC4926EA
+
+RUN set -x \
+    && echo "deb http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/ocata main" > /etc/apt/sources.list.d/ocata.list \
+    && apt-get -y update \
+    && apt-get -y install \
+    && apt-get -y install openstack-dashboard \
+                          python-openstackclient \
+    && apt-get -y clean
+
+EXPOSE 80
+
+COPY local_settings.py /etc/openstack-dashboard/local_settings.py
+
+# Add a redirect to /keystone instead of the "It works! page"
+COPY 000-default.conf /etc/apache2/sites-available
+
+RUN chown -R www-data: /var/lib/openstack-dashboard/
+
+RUN touch /var/log/horizon.log
+
+RUN chown www-data: /var/log/horizon.log
+
+RUN chown horizon: /var/lib/openstack-dashboard/secret_key
+
+CMD apachectl -DFOREGROUND
+