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Created July 26, 2018 13:25
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Spring Boot exectuable jar Dockerfile with JAVA_OPTS, debugging and JRebel support
# Used as a base image that other Spring Boot-based
# docker containers can be based off of. Example dependent Dockerfile:
#
# FROM <this-image>
# ADD target/myjar.jar /app.jar
#
# Alternatively, you can modify this file to use a build arg:
# ...
# ...
# ARG JAR_FILE
# ADD ${JAR_FILE} app.jar
#
# and then build with:
#
# docker build --build-arg JAR_FILE=target/myjar.jar .
#
# This image can be built in 2 modes:
# 1. Normal - assumes an /app.jar is present as a fat Spring-Bootified jar file (executes with java -jar)
# 2. Jrebel - also downloads the Jrebel agent embedded in the image. An image with the JRebel agent downloaded
# can set a JREBEL environment variable (must be a non-empty string) to activate the Jrebel JVM parameters.
# This relies on JRebel remoting and a rebel-remote.xml built into the /app.jar
FROM openjdk:8u151-jdk-alpine
VOLUME /tmp
ADD run-app.sh run-app.sh
RUN chmod +x run-app.sh
ADD wait-for.sh wait-for.sh
RUN chmod +x wait-for.sh
# Only downloads jrebel if the argument is set
ARG JREBEL
ENV JREBEL=${JREBEL}
ADD download-jrebel.sh download-jrebel.sh
RUN chmod +x download-jrebel.sh && ./download-jrebel.sh
ENTRYPOINT ./run-app.sh
if [ -z ${JREBEL} ]; then
echo "Set the JREBEL argument to download and use JRebel remoting inside the container"
else
apk --no-cache add wget unzip
wget http://dl.zeroturnaround.com/jrebel-stable-nosetup.zip
unzip jrebel-stable-nosetup.zip
fi
if [ "$DEBUG_PORT" ]; then
export JAVA_OPTS="$JAVA_OPTS -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=$DEBUG_PORT"
fi
if [ "$JREBEL" ]; then
export JREBEL_ARGS="-agentpath:jrebel/lib/libjrebel64.so -Drebel.remoting_plugin=true"
export JAVA_OPTS="$JAVA_OPTS $JREBEL_ARGS"
fi
# Moved into a shell script because the above 'export' statements cannot be retrieved
# between multiple statements in a Dockerfile
echo "Starting Java with the arguments $JAVA_OPTS"
java $JAVA_OPTS -Djava.security.egd=file:/dev/./urandom -jar /app.jar
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