diff --git a/supplemental/docker/prod/Dockerfile b/supplemental/docker/prod/Dockerfile
index 35f0148..9555bee 100644
--- a/supplemental/docker/prod/Dockerfile
+++ b/supplemental/docker/prod/Dockerfile
@@ -1,267 +1,268 @@
-FROM ubuntu:xenial as base
-
-ARG BUILD_REPO
-ARG MAIN_SUBDOMAIN=www
-ARG IMAGE_SUBDOMAIN=images
-ARG ROOTDIR=/home/httpd/www
-ARG IMAGEROOTDIR=/home/httpd/images
-ARG LOCAL_INSTALL_DIR=/usr/local/share/www
-
-ARG GIT_FOLDER=/backend
-
-LABEL maintainer="ivan.kuchin@gmail.com"
-LABEL org.opencontainers.image.source="https://github.com/IvanKuchin/${BUILD_REPO}"
-
-###########################################
-# check if all mandatory args are defined #
-###########################################
-RUN [ -z "$BUILD_REPO" ] && echo "BUILD_REPO is required" && exit 1 || true
-RUN echo repository is $BUILD_REPO
-
-###########################
-# install basic utilities #
-###########################
-RUN apt update &&  apt install --no-install-recommends --no-install-suggests -y git ca-certificates && apt clean
-
-####################
-# install timezone #
-####################
-RUN apt-get install --no-install-recommends --no-install-suggests -y tzdata && apt clean
-RUN cp /usr/share/zoneinfo/Europe/Moscow /etc/localtime
-RUN echo "Europe/Moscow" > /etc/timezone
-RUN date
-
-##############################
-# install additional locales #
-##############################
-RUN apt-get install --no-install-recommends --no-install-suggests -y locales gettext && apt clean
-RUN locale-gen ru_RU.utf8
-RUN locale-gen en_US.utf8
-RUN update-locale
-RUN export LC_ALL=en_US.utf8
-
-############################################################################################
-
-FROM base as app
-
-ARG BUILD_REPO
-ARG MAIN_SUBDOMAIN
-ARG IMAGE_SUBDOMAIN
-ARG ROOTDIR
-ARG IMAGEROOTDIR
-ARG LOCAL_INSTALL_DIR
-
-########################
-# install dependencies #
-########################
-RUN apt-get install --no-install-recommends --no-install-suggests -y software-properties-common; \
-    add-apt-repository -y ppa:jonathonf/ffmpeg-4; \
-    apt update; \
-    apt-get install --no-install-recommends --no-install-suggests -y \ 
-        build-essential \
-        cmake \
-        ffmpeg \
-        gsfonts \
-        graphicsmagick-libmagick-dev-compat \
-        libavcodec-dev \
-        libavformat-dev \
-        libavutil-dev \
-        libcurl4-openssl-dev \
-        libgraphicsmagick++-dev \
-        libhpdf-dev \
-        libmaxminddb-dev \
-        libmysqlclient-dev \
-        libssl-dev \
-        libwebp-dev \
-        libarchive-dev \
-        rapidjson-dev \
-        pkg-config && \
-    apt-get clean
-
-#############################
-# libwkhtmltox installation #
-#############################
-RUN apt-get install --no-install-recommends --no-install-suggests -y wget && apt clean
-RUN wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.trusty_amd64.deb
-RUN dpkg -i  wkhtmltox_0.12.5-1.trusty_amd64.deb || true     # trick to force dpkg return successfull return code
-RUN apt install -f --no-install-recommends --no-install-suggests -y && apt clean
-
-#############################
-# libwebsocket installation #
-#############################
-RUN git clone -b v2.2.0 --depth 1 https://github.com/warmcat/libwebsockets.git /libwebsockets
-WORKDIR /libwebsockets
-RUN mkdir build \
- && cd build \
- && cmake -DLWS_WITHOUT_DAEMONIZE:BOOL=FALSE -DLWS_WITH_STATIC=1 -DLWS_WITH_SHARED=1 -DCMAKE_INSTALL_PREFIX:PATH=/usr/local/share/libwebsockets/ .. \
- && make install && make clean
-
-############
-# pull src #
-############
-COPY . ${GIT_FOLDER}
-WORKDIR ${GIT_FOLDER}
-RUN git clone --depth 1 https://github.com/IvanKuchin/backend_pi.git ./src/pi
-
-##################
-# save commit id #
-##################
-RUN git rev-parse HEAD > ./supplemental/git/git_commit_id
-
-##################################
-# install mail sender && apache2 #
-##################################
-RUN apt-get install --no-install-recommends --no-install-suggests -y ssmtp apache2 && apt clean
-
-#########################
-# configure mail sender #
-#########################
-
-#####################
-# configure apache2 #
-#####################
-RUN git clone --depth 1 https://github.com/IvanKuchin/${BUILD_REPO}-ui.git ${ROOTDIR}
-RUN git -C ${ROOTDIR} rev-parse HEAD > ${ROOTDIR}/cgi-bin/templates/git_commit_id     # it is used in user account to show current commit_id
-RUN cp -R ${ROOTDIR}/supplemental/apache2 /etc
-RUN mkdir ${ROOTDIR}/logs/
-RUN mkdir -p ${IMAGEROOTDIR}
-
-RUN a2enmod cgi \
- && a2enmod rewrite \
- && a2enmod expires \
- && a2enconf mod_expires \
- && a2dissite `ls /etc/apache2/sites-enabled/` \
- && a2ensite *www
-
-##################### 
-# build from source #
-##################### 
-RUN mkdir build
-RUN cd build \ 
-    && cmake \
-        -DMAIN_SUBDOMAIN=${MAIN_SUBDOMAIN} \
-        -DIMAGE_SUBDOMAIN=${IMAGE_SUBDOMAIN} \
-        -DROOTDIR=${ROOTDIR} \
-        -DIMAGEROOTDIR=${IMAGEROOTDIR} \
-        -DLOCAL_INSTALL_DIR=${LOCAL_INSTALL_DIR} \
-        .. \
-    && make -j2 \
-    && make install \
-    && make clean
-
-EXPOSE 80
-
-####################################################################
-# change folders to proper owner                                   #
-####################################################################
-RUN chown -R www-data:www-data ${ROOTDIR} \
- && chown -R www-data:www-data ${IMAGEROOTDIR} \
- && chown -R www-data:www-data ${LOCAL_INSTALL_DIR}
-
-############################################################
-## forward request and error logs to docker log collector ##
-############################################################
-#RUN ln -sf /dev/stdout /var/log/nginx/access.log \
-# && ln -sf /dev/stderr /var/log/nginx/error.log
-
-STOPSIGNAL SIGTERM
-
-CMD ["apachectl", "-D", "FOREGROUND", ""]
-
-
-############################################################################################
-
-
-FROM base as images
-
-ARG BUILD_REPO
-ARG MAIN_SUBDOMAIN
-ARG IMAGE_SUBDOMAIN
-ARG ROOTDIR
-ARG IMAGEROOTDIR
-ARG LOCAL_INSTALL_DIR
-
-###################
-# install apache2 #
-###################
-RUN apt-get install --no-install-recommends --no-install-suggests -y apache2 && apt clean
-
-#####################
-# configure apache2 #
-#####################
-RUN git clone --depth 1 https://github.com/IvanKuchin/${BUILD_REPO}-ui.git ${ROOTDIR}
-RUN cp -R ${ROOTDIR}/supplemental/apache2 /etc
-RUN mkdir -p ${IMAGEROOTDIR}/cgi-bin/ \
- && mkdir -p ${IMAGEROOTDIR}/html/ \
- && mkdir -p ${IMAGEROOTDIR}/logs/
-
-RUN a2enmod rewrite \
- && a2enmod expires \
- && a2enmod headers \
- && a2enconf mod_expires \
- && a2dismod cgi \
- && a2dissite `ls /etc/apache2/sites-enabled/` \
- && a2ensite *images
-
-EXPOSE 80
-
-####################################################################
-# change folders to proper owner                                   #
-####################################################################
-RUN chown -R www-data:www-data ${IMAGEROOTDIR}
-
-####################################################################
-# remove unnecessary folders                                       #
-####################################################################
-RUN rm -rf ${LOCAL_INSTALL_DIR} \
- && rm -rf ${ROOTDIR} \
- && rm -rf ${GIT_FOLDER}
-
-############################################################
-## forward request and error logs to docker log collector ##
-############################################################
-#RUN ln -sf /dev/stdout /var/log/nginx/access.log \
-# && ln -sf /dev/stderr /var/log/nginx/error.log
-
-STOPSIGNAL SIGTERM
-
-CMD ["apachectl", "-D", "FOREGROUND", ""]
-
-
-
-############################################################################################
-
-
-FROM app as cron
-
-ARG BUILD_REPO
-ARG MAIN_SUBDOMAIN
-ARG IMAGE_SUBDOMAIN
-ARG ROOTDIR
-ARG IMAGEROOTDIR
-ARG LOCAL_INSTALL_DIR
-
-##############################
-# install and configure cron #
-##############################
-RUN apt-get install --no-install-recommends --no-install-suggests -y cron && apt clean
-RUN cp ${LOCAL_INSTALL_DIR}/cron/cron_config /etc/cron.d/www
-RUN chmod 644 /etc/cron.d/www \
- && chown root:root /etc/cron.d/www
-
-CMD ["cron", "-f"]
-
-############################################################################################
-
-
-FROM app as chat
-
-ARG BUILD_REPO
-ARG MAIN_SUBDOMAIN
-ARG IMAGE_SUBDOMAIN
-ARG ROOTDIR
-ARG IMAGEROOTDIR
-ARG LOCAL_INSTALL_DIR
-
-WORKDIR ${LOCAL_INSTALL_DIR}/chat
-CMD ["./chat-server", "-s"]
+FROM ubuntu:xenial as base
+
+ARG BUILD_REPO
+ARG MAIN_SUBDOMAIN=www
+ARG IMAGE_SUBDOMAIN=images
+ARG ROOTDIR=/home/httpd/www
+ARG IMAGEROOTDIR=/home/httpd/images
+ARG LOCAL_INSTALL_DIR=/usr/local/share/www
+
+ARG GIT_FOLDER=/backend
+
+LABEL maintainer="ivan.kuchin@gmail.com"
+LABEL org.opencontainers.image.source="https://github.com/IvanKuchin/${BUILD_REPO}"
+
+###########################################
+# check if all mandatory args are defined #
+###########################################
+RUN [ -z "$BUILD_REPO" ] && echo "BUILD_REPO is required" && exit 1 || true
+RUN echo repository is $BUILD_REPO
+
+###########################
+# install basic utilities #
+###########################
+RUN apt update &&  apt install --no-install-recommends --no-install-suggests -y git ca-certificates && apt clean
+
+####################
+# install timezone #
+####################
+RUN apt-get install --no-install-recommends --no-install-suggests -y tzdata && apt clean
+RUN cp /usr/share/zoneinfo/Europe/Moscow /etc/localtime
+RUN echo "Europe/Moscow" > /etc/timezone
+RUN date
+
+##############################
+# install additional locales #
+##############################
+RUN apt-get install --no-install-recommends --no-install-suggests -y locales gettext && apt clean
+RUN locale-gen ru_RU.utf8
+RUN locale-gen en_US.utf8
+RUN update-locale
+RUN export LC_ALL=en_US.utf8
+
+############################################################################################
+
+FROM base as app
+
+ARG BUILD_REPO
+ARG MAIN_SUBDOMAIN
+ARG IMAGE_SUBDOMAIN
+ARG ROOTDIR
+ARG IMAGEROOTDIR
+ARG LOCAL_INSTALL_DIR
+
+########################
+# install dependencies #
+########################
+RUN apt-get install --no-install-recommends --no-install-suggests -y software-properties-common; \
+    add-apt-repository -y ppa:jonathonf/ffmpeg-4; \
+    apt update; \
+    apt-get install --no-install-recommends --no-install-suggests -y \ 
+        build-essential \
+        cmake \
+        ffmpeg \
+        gsfonts \
+        graphicsmagick-libmagick-dev-compat \
+        libavcodec-dev \
+        libavformat-dev \
+        libavutil-dev \
+        libcurl4-openssl-dev \
+        libgraphicsmagick++-dev \
+        libhpdf-dev \
+        libmaxminddb-dev \
+        libmysqlclient-dev \
+        libssl-dev \
+        libwebp-dev \
+        libarchive-dev \
+        rapidjson-dev \
+        pkg-config && \
+    apt-get clean
+
+#############################
+# libwkhtmltox installation #
+#############################
+RUN apt-get install --no-install-recommends --no-install-suggests -y wget && apt clean
+RUN wget https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.trusty_amd64.deb
+RUN dpkg -i  wkhtmltox_0.12.5-1.trusty_amd64.deb || true     # trick to force dpkg return successfull return code
+RUN apt install -f --no-install-recommends --no-install-suggests -y && apt clean
+
+#############################
+# libwebsocket installation #
+#############################
+RUN git clone -b v2.2.0 --depth 1 https://github.com/warmcat/libwebsockets.git /libwebsockets
+WORKDIR /libwebsockets
+RUN mkdir build \
+ && cd build \
+ && cmake -DLWS_WITHOUT_DAEMONIZE:BOOL=FALSE -DLWS_WITH_STATIC=1 -DLWS_WITH_SHARED=1 -DCMAKE_INSTALL_PREFIX:PATH=/usr/local/share/libwebsockets/ .. \
+ && make install && make clean
+
+############
+# pull src #
+############
+COPY . ${GIT_FOLDER}
+WORKDIR ${GIT_FOLDER}
+RUN git clone --depth 1 https://github.com/IvanKuchin/backend_pi.git ./src/pi
+
+##################
+# save commit id #
+##################
+RUN git rev-parse HEAD > ./supplemental/git/git_commit_id
+
+##################################
+# install mail sender && apache2 #
+##################################
+RUN apt-get install --no-install-recommends --no-install-suggests -y ssmtp apache2 && apt clean
+
+#########################
+# configure mail sender #
+#########################
+RUN chown -R www-data:www-data ${IMAGEROOTDIR}
+
+#####################
+# configure apache2 #
+#####################
+RUN git clone --depth 1 https://github.com/IvanKuchin/${BUILD_REPO}-ui.git ${ROOTDIR}
+RUN git -C ${ROOTDIR} rev-parse HEAD > ${ROOTDIR}/cgi-bin/templates/git_commit_id     # it is used in user account to show current commit_id
+RUN cp -R ${ROOTDIR}/supplemental/apache2 /etc
+RUN mkdir ${ROOTDIR}/logs/
+RUN mkdir -p ${IMAGEROOTDIR}
+
+RUN a2enmod cgi \
+ && a2enmod rewrite \
+ && a2enmod expires \
+ && a2enconf mod_expires \
+ && a2dissite `ls /etc/apache2/sites-enabled/` \
+ && a2ensite *www
+
+##################### 
+# build from source #
+##################### 
+RUN mkdir build
+RUN cd build \ 
+    && cmake \
+        -DMAIN_SUBDOMAIN=${MAIN_SUBDOMAIN} \
+        -DIMAGE_SUBDOMAIN=${IMAGE_SUBDOMAIN} \
+        -DROOTDIR=${ROOTDIR} \
+        -DIMAGEROOTDIR=${IMAGEROOTDIR} \
+        -DLOCAL_INSTALL_DIR=${LOCAL_INSTALL_DIR} \
+        .. \
+    && make -j2 \
+    && make install \
+    && make clean
+
+EXPOSE 80
+
+####################################################################
+# change folders to proper owner                                   #
+####################################################################
+RUN chown -R www-data:www-data ${ROOTDIR} \
+ && chown -R www-data:www-data ${IMAGEROOTDIR} \
+ && chown -R www-data:www-data ${LOCAL_INSTALL_DIR}
+
+############################################################
+## forward request and error logs to docker log collector ##
+############################################################
+#RUN ln -sf /dev/stdout /var/log/nginx/access.log \
+# && ln -sf /dev/stderr /var/log/nginx/error.log
+
+STOPSIGNAL SIGTERM
+
+CMD ["apachectl", "-D", "FOREGROUND", ""]
+
+
+############################################################################################
+
+
+FROM base as images
+
+ARG BUILD_REPO
+ARG MAIN_SUBDOMAIN
+ARG IMAGE_SUBDOMAIN
+ARG ROOTDIR
+ARG IMAGEROOTDIR
+ARG LOCAL_INSTALL_DIR
+
+###################
+# install apache2 #
+###################
+RUN apt-get install --no-install-recommends --no-install-suggests -y apache2 && apt clean
+
+#####################
+# configure apache2 #
+#####################
+RUN git clone --depth 1 https://github.com/IvanKuchin/${BUILD_REPO}-ui.git ${ROOTDIR}
+RUN cp -R ${ROOTDIR}/supplemental/apache2 /etc
+RUN mkdir -p ${IMAGEROOTDIR}/cgi-bin/ \
+ && mkdir -p ${IMAGEROOTDIR}/html/ \
+ && mkdir -p ${IMAGEROOTDIR}/logs/
+
+RUN a2enmod rewrite \
+ && a2enmod expires \
+ && a2enmod headers \
+ && a2enconf mod_expires \
+ && a2dismod cgi \
+ && a2dissite `ls /etc/apache2/sites-enabled/` \
+ && a2ensite *images
+
+EXPOSE 80
+
+####################################################################
+# change folders to proper owner                                   #
+####################################################################
+RUN chown -R www-data:www-data ${IMAGEROOTDIR}
+
+####################################################################
+# remove unnecessary folders                                       #
+####################################################################
+RUN rm -rf ${LOCAL_INSTALL_DIR} \
+ && rm -rf ${ROOTDIR} \
+ && rm -rf ${GIT_FOLDER}
+
+############################################################
+## forward request and error logs to docker log collector ##
+############################################################
+#RUN ln -sf /dev/stdout /var/log/nginx/access.log \
+# && ln -sf /dev/stderr /var/log/nginx/error.log
+
+STOPSIGNAL SIGTERM
+
+CMD ["apachectl", "-D", "FOREGROUND", ""]
+
+
+
+############################################################################################
+
+
+FROM app as cron
+
+ARG BUILD_REPO
+ARG MAIN_SUBDOMAIN
+ARG IMAGE_SUBDOMAIN
+ARG ROOTDIR
+ARG IMAGEROOTDIR
+ARG LOCAL_INSTALL_DIR
+
+##############################
+# install and configure cron #
+##############################
+RUN apt-get install --no-install-recommends --no-install-suggests -y cron && apt clean
+RUN cp ${LOCAL_INSTALL_DIR}/cron/cron_config /etc/cron.d/www
+RUN chmod 644 /etc/cron.d/www \
+ && chown root:root /etc/cron.d/www
+
+CMD ["cron", "-f"]
+
+############################################################################################
+
+
+FROM app as chat
+
+ARG BUILD_REPO
+ARG MAIN_SUBDOMAIN
+ARG IMAGE_SUBDOMAIN
+ARG ROOTDIR
+ARG IMAGEROOTDIR
+ARG LOCAL_INSTALL_DIR
+
+WORKDIR ${LOCAL_INSTALL_DIR}/chat
+CMD ["./chat-server", "-s"]