res/tomcat-maven/Dockerfile

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# to you under the Apache License, Version 2.0 (the
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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FROM openjdk:8-jre-alpine
VOLUME /tmp

USER root
RUN mkdir -m 777 -p /deployments

ADD target/tomcat-maven-1.0.jar /deployments/app.jar
ADD conf /deployments/conf
ADD webapps /deployments/webapps

WORKDIR /deployments

ARG namespace=tomcat
ENV KUBERNETES_NAMESPACE=$namespace
ARG port=8080
EXPOSE $port

ENV JAVA_OPTS="-Dcatalina.base=. -Djava.security.egd=file:/dev/urandom"

# Add JULI logging configuration
ENV JAVA_OPTS="${JAVA_OPTS} -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config.file=conf/logging.properties"

RUN sh -c 'touch app.jar'

RUN mkdir -p /opt

# Optional: Add Jolokia agent for JMX monitoring and management
# RUN mkdir /opt/jolokia && wget https://repo.maven.apache.org/maven2/org/jolokia/jolokia-jvm/1.6.2/jolokia-jvm-1.6.2-agent.jar -O /opt/jolokia/jolokia.jar
# ARG jolokiaport=8778
# ENV JAVA_OPTS="-javaagent:/opt/jolokia/jolokia.jar=host=*,port=$jolokiaport,protocol=https,authIgnoreCerts=true ${JAVA_OPTS}"
# EXPOSE $jolokiaport

# Optional: Add Prometheus agent for JMX monitoring
# RUN mkdir /opt/prometheus && wget https://repo.maven.apache.org/maven2/io/prometheus/jmx/jmx_prometheus_javaagent/0.12.0/jmx_prometheus_javaagent-0.12.0.jar -O /opt/prometheus/prometheus.jar && wget https://raw.githubusercontent.com/prometheus/jmx_exporter/master/example_configs/tomcat.yml -O conf/prometheus.yaml
# ARG prometheusport=9404
# ENV JAVA_OPTS="-javaagent:/opt/prometheus/prometheus.jar=$prometheusport:conf/prometheus.yaml ${JAVA_OPTS}"
# EXPOSE $prometheusport

ENTRYPOINT [ "sh", "-c", "java $JAVA_OPTS -jar app.jar" ]