# Only the instructions RUN, COPY, ADD create layers

# Reference image
 FROM ubuntu:latest

# Meta data (OCI standard)
  LABEL org.opencontainers.image.title="My image"
  LABEL org.opencontainers.image.description="My description"
  LABEL org.opencontainers.image.authors="Pierre ROYER <mail@pierreau.fr>"
  LABEL org.opencontainers.image.url="https://pierreau.fr/pro/"
  LABEL org.opencontainers.image.version="2"
  LABEL org.opencontainers.image.revision="1"
  LABEL org.opencontainers.image.created="2016-11-28T15:00:00+02:00" # UTC+2 (rfc3339)
# Meta data (not standard)
  LABEL Environment="production"  Site="Nantes"

# Installing packages without interruption (Debian)
#  ARG DEBIAN_FRONTEND=noninteractive

# Commands executed during image creation
# Change mirror source for best performances
  RUN sed -i 's/ports.ubuntu.com/fr.ports.ubuntu.com/' /etc/apt/sources.list.d/ubuntu.sources

  RUN apt-get update && apt-get upgrade -y
  RUN apt install -y --no-install-recommends \
          apache2 \
          cron \
          curl \
          openssh-server \
          tzdata \
          vim \
          wget

# Remove unnecessary files to optimize image size
  RUN apt clean ; rm -rf /var/lib/apt/lists/*

# Setup time zone
  ENV TZ=Europe/Paris
  RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
  RUN dpkg-reconfigure --frontend noninteractive tzdata

# Apache configuration
  RUN  echo 'ServerName apache.pierreau.fr:80' >> /etc/apache2/apache2.conf

# Copying files from host to container
#  RUN  cd /var/www/html/
#  RUN  mv index.html index.html.old
#  COPY index.html /var/www/html/

#  RUN  wget https://cloud.pierreau.fr/index.html

# Allows adding URLs or archives
  ADD https://cloud.pierreau.fr/index.html .

# Mount points created in container
  VOLUME   ["/var/www/html", "/etc/apache2", "/var/log/apache2/"]

# Adding a user
  RUN   useradd -m -s /bin/bash -p M0t2P@$$ sshuser
  USER  sshuser
# Specifies default directory
  WORKDIR /home/sshuser
  RUN   echo "df -h" > .profile
  USER  root

# ENTRYPOINT command (not overridable by docker run) launched at container startup
# COPY  docker-entrypoint.sh /root/
# RUN   chmod 700 /root/docker-entrypoint.sh
# ENTRYPOINT ["/root/docker-entrypoint.sh"]

# Command (overloadable by docker run) launched when the container starts
  CMD  ["/usr/sbin/apachectl", "-D", "FOREGROUND"]

# For information purposes, specifies the ports/protocols used
  EXPOSE 80 22/tcp 123/udp