Dockerfile

# Set the base image
FROM openjdk:8-jre-alpine

LABEL maintainer="Lightstreamer Server Development Team <support@lightstreamer.com>"

# Set environment variables to identify the right Lightstreamer version
ENV LIGHTSTREAMER_VERSION 7_0_3_20190107
ENV LIGHTSTREAMER_URL_DOWNLOAD http://www.lightstreamer.com/repo/distros/Lightstreamer_${LIGHTSTREAMER_VERSION}.tar.gz

# Set the temporary working dir
WORKDIR /lightstreamer

# Install the required packages
RUN set -ex; \
        apk add --no-cache --virtual .deps \
                   gnupg \
                   tar \
                   curl \
# Import Lighstreamer's public key
        && gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 9B90BFD14309C7DA5EF58D7D4A8C08966F29B4D2 \
# Download the distribution from the Lightstreamer site, verify the signature, and unpack
        &&  set -ex; \
               curl -fSL -o Lightstreamer.tar.gz ${LIGHTSTREAMER_URL_DOWNLOAD} \
               && curl -fSL -o Lightstreamer.tar.gz.asc ${LIGHTSTREAMER_URL_DOWNLOAD}.asc \
               && gpg --batch --verify Lightstreamer.tar.gz.asc Lightstreamer.tar.gz \
               && tar -xvf Lightstreamer.tar.gz --strip-components=1 \
# Replace the fictitious jdk path with the JAVA_HOME environment variable in the launch script file
               && sed -i -- 's/\/usr\/jdk1.8.0/$JAVA_HOME/' bin/unix-like/LS.sh \
# Adjust the logging configuration in order to log only on standard output.
               && sed -i -e '164,$s/<appender-ref ref="LSConsole" \/>/<!--<appender-ref ref="LSConsole" \/>-->/' \
                         -e '116,$s/<appender-ref ref="LSDailyRolling" \/>/<appender-ref ref="LSConsole" \/>/' \
                         -e '/<!--<appender-ref ref="LSConsole" \/>-->/ d' conf/lightstreamer_log_conf.xml \
# Finally, remove no longer needed packages and files
               && apk del .deps \
               && rm Lightstreamer.tar.gz Lightstreamer.tar.gz.asc

# Export TCP port 8080
EXPOSE 8080

# Set the final working dir
WORKDIR /lightstreamer/bin/unix-like

# Start the server
CMD ["./LS.sh", "run"]