Installing karaf on fedora-Docker - docker

Question

I am trying to create an image with fedora which has karaf inside it.I am not understanding how to do this using the Dockerfile.I am using the following docker file
FROM fedora
FROM openjdk:8-jre-slim
ENV RESOURCE_DIR /var/resources
ENV VAROPT_DIR /var/opt
ENV LOG_DIR /var/opt/log
ENV KARAF_VERSION 3.0.8
ENV OSGI_BASE /usr/local/osgi
ENV INSTANCE_NAME cus
ENV OSGI_DEPLOY_DIR /deploy
# Install Karaf
RUN mkdir -p ${OSGI_BASE}
ADD http://www.apache.org/dyn/closer.lua/karaf/3.0.8/apache-karaf-3.0.8.tar.gz ${OSGI_BASE}/
WORKDIR ${OSGI_BASE}
RUN gunzip apache-karaf-${KARAF_VERSION}.tar.gz
RUN tar -xvf apache-karaf-${KARAF_VERSION}.tar
RUN ln -s apache-karaf-${KARAF_VERSION} latest
# Cutomize to enable mount volumes
WORKDIR ${OSGI_BASE}/latest/etc
RUN sed -i 's/karaf.framework=felix/karaf.framework=equinox/' config.properties
RUN sed -i 's/^\(felix\.fileinstall\.dir\s*=\s*\).*$/\1\/deploy/' org.apache.felix.fileinstall-deploy.cfg
RUN sed -i 's%${karaf.data}%/var/opt%' org.ops4j.pax.logging.cfg
# Include war as part of base feature
RUN sed -i '/^featuresBoot=/s/$/,http,war/' org.apache.karaf.features.cfg
ENV PATH ${OSGI_BASE}/latest/bin:$PATH
# Expose ports
EXPOSE 8101 8181 2181
# Define Mountable volumes
RUN mkdir -p ${LOG_DIR}
VOLUME ${VAROPT_DIR}
RUN mkdir ${OSGI_DEPLOY_DIR}
VOLUME ${OSGI_DEPLOY_DIR}
WORKDIR ${RESOURCE_DIR}
RUN mkdir -p ${RESOURCE_DIR}
The dockerfile runs and works fine.The only thing i dont understand is weather it has served the purpose. ie whether the karaf got copied on to the fedora os properly or did it just create a image with karaf on it.How to check it.Please help.