vi run.sh
---------
#!/usr/bin/env sh
# Fail on *any* error
set -e

# Remove stale PID
rm -rf /var/run/minidlna/minidlna.pid

# Setup config
echo "port=8200" > /tmp/minidlna.conf
echo "friendly_name=docker" >> /tmp/minidlna.conf
echo "media_dir=/media" >> /tmp/minidlna.conf
echo "Starting minidlna daemon..."
minidlnad -d -f /tmp/minidlna.conf

vi Dockerfile
-------------
FROM alpine
VOLUME /media
COPY ./run.sh /run.sh
RUN echo "Adding minidlna from package repository" && \
    apk add --no-cache --update minidlna=~1.3 && \
    echo "Cleaning up" && \
    rm -rf /var/cache/apk/* /tmp/*
ENTRYPOINT ["./run.sh"]

chmod +x run.sh
docker build -t docker-dlna .
docker run -d --name dlna --net=host -v /home/user/media:/media docker-dlna

Im Browser:
http:<Server>:8200