optimized docker file

Dockerfile

@@ -4,38 +4,72 @@ MAINTAINER Andre Germann <https://buanet.de>
 
 ENV DEBIAN_FRONTEND noninteractive
 
-RUN apt-get update && apt-get install -y build-essential python apt-utils curl avahi-daemon git libpcap-dev libavahi-compat-libdnssd-dev libfontconfig gnupg2 locales procps libudev-dev libpam0g-dev unzip sudo wget ffmpeg android-tools-adb android-tools-fastboot
+# Install necessary packages
+RUN apt-get update && apt-get install -y \
+        android-tools-adb \
+        android-tools-fastboot \
+        apt-utils \
+        avahi-daemon \
+        build-essential \
+        curl \
+        ffmpeg \
+        git \
+        gnupg2 \
+        libavahi-compat-libdnssd-dev \
+        libfontconfig \
+        libpam0g-dev \
+        libpcap-dev \
+        libudev-dev \
+        locales \
+        procps \
+        python \
+        sudo \
+        unzip \
+        wget \
+    && rm -rf /var/lib/apt/lists/*
 
+# Install node8
 RUN curl -sL https://deb.nodesource.com/setup_8.x | bash
-RUN apt-get install -y nodejs
+RUN apt-get update && apt-get install -y \
+        nodejs \
+    && rm -rf /var/lib/apt/lists/*
 
+# Configure avahi-daemon 
 RUN sed -i '/^rlimit-nproc/s/^\(.*\)/#\1/g' /etc/avahi/avahi-daemon.conf
-RUN sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen && \dpkg-reconfigure --frontend=noninteractive locales && \update-locale LANG=de_DE.UTF-8
+
+# Configure locales/ language/ timezone
+RUN sed -i -e 's/# de_DE.UTF-8 UTF-8/de_DE.UTF-8 UTF-8/' /etc/locale.gen \
+    && \dpkg-reconfigure --frontend=noninteractive locales \
+    && \update-locale LANG=de_DE.UTF-8
 ENV LANG de_DE.UTF-8 
 RUN cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime
 ENV TZ Europe/Berlin
 
-# RUN mkdir -p /opt/iobroker/ && chmod 777 /opt/iobroker/
-RUN mkdir -p /opt/scripts/ && chmod 777 /opt/scripts/
-
+# Create scripts directory and copy scripts
+RUN mkdir -p /opt/scripts/ \
+    && chmod 777 /opt/scripts/
 WORKDIR /opt/scripts/
-
 ADD scripts/avahi_startup.sh avahi_startup.sh
-RUN chmod +x avahi_startup.sh
-RUN mkdir /var/run/dbus/
-
 ADD scripts/iobroker_startup.sh iobroker_startup.sh
-RUN chmod +x iobroker_startup.sh
+RUN chmod +x avahi_startup.sh \
+    && chmod +x iobroker_startup.sh \
+    && mkdir /var/run/dbus/
 
+# Install ioBroker
 WORKDIR /
+RUN echo $(hostname) > /opt/scripts/.install_host \
+    && apt-get update \
+    && curl -sL https://raw.githubusercontent.com/ioBroker/ioBroker/stable-installer/installer.sh | bash - \
+    && rm -rf /var/lib/apt/lists/*
 
-RUN echo $(hostname) > /opt/scripts/.install_host && curl -sL https://raw.githubusercontent.com/ioBroker/ioBroker/stable-installer/installer.sh | bash -
-# RUN update-rc.d iobroker.sh remove
-
+# Install node-gyp
 WORKDIR /opt/iobroker/
 RUN npm install node-gyp -g
+
+# Backup initial ioBroker-folder
 RUN tar -cf /opt/initial_iobroker.tar /opt/iobroker
 
+# Run startup-script
 CMD ["sh", "/opt/scripts/iobroker_startup.sh"]
 
 ENV DEBIAN_FRONTEND teletype