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Dockerfile

  • Download: Dockerfile

    Code Block
    languagebash
    titleDockerfile
    linenumberstrue
    collapsetrue
    FROM openjdk:8
LABEL maintainer="Software- und Organisations-Service GmbH"

# default user id has to match later run-time user
ARG USER_ID=$UID

# provide build arguments for release information
ARG JS_MAJOR=1.13
ARG JS_RELEASE=1.13.3-SNAPSHOT

# add installer archive file
COPY jobscheduler_linux-x64.${JS_RELEASE}.tar.gz /usr/local/src/
RUN test -e /usr/local/src/jobscheduler_linux-x64.${JS_RELEASE}.tar.gz && \
    tar zxvf /usr/local/src/jobscheduler_linux-x64.${JS_RELEASE}.tar.gz -C /usr/local/src/ && \
    rm -f /usr/local/src/jobscheduler_linux-x64.${JS_RELEASE}.tar.gz && \
    ln -s /usr/local/src/jobscheduler.${JS_RELEASE} /usr/local/src/jobscheduler

# for JDK < 12, /dev/random does not provide sufficient entropy, see https://kb.sos-berlin.com/x/lIM3
RUN rm /dev/random && ln -s /dev/urandom /dev/random

# copy installer response file and run installer
COPY jobscheduler_install.xml /usr/local/src/jobscheduler/jobscheduler_install.xml
RUN /usr/local/src/jobscheduler/setup.sh -u /usr/local/src/jobscheduler/jobscheduler_install.xml

# make default user the owner of directories
RUN groupadd --gid ${USER_ID:-1000} jobscheduler && \
    useradd --uid ${USER_ID:-1000} --gid jobscheduler --home-dir /home/jobscheduler --no-create-home --shell /bin/bash jobscheduler && \
    chown -R jobscheduler:jobscheduler /var/sos-berlin.com

# copy and prepare start script
COPY start_jobscheduler.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/start_jobscheduler.sh

# create volumes for data persistence
VOLUME /var/sos-berlin.com/jobscheduler/testsuite/config/live

# allow incoming traffic to port
EXPOSE 40444

# run-time user, can be overwritten when running the container
USER jobscheduler

CMD ["/usr/local/bin/start_jobscheduler.sh"]
  • Explanations
    • Line 1: We start from a CentOS image that includes JDK 8. Newer Java version can be used, see Which Java versions is JobScheduler available for?
    • Line 5: Consider that $UID provides the numeric ID of the account that the JobScheduler Master installation inside the Docker container is performed for. This numeric ID typically starts above 1000 and should correspond to the account that is used on the Docker host, i.e. the account on the Docker Host and the account inside the container should use the same numeric ID. This mechanism simplifies exposure of the Docker container's file system.
    • Line 8-9: Adjust the JobScheduler release number as required.
    • Line 12-16: The installer tarball is copied and extracted to the container.
    • Line 22-23: The installer response file is copied to the container, for details of this file see next chapter. Then the installer is executed for the current user.
    • Line 26-28: An account and group "jobscheduler" is created that is handed over ownership of installed files.
    • Line 31-32: The start script is copied to the container, see below chapter Start Script.
    • Line 35: A volume is indicated for later mapping to a mount point at run-time.
    • Line 38: Port 40444 is exposed for later mapping. This port is used for the connection between JOC Cockpit and JobScheduler Master.
    • Line 41: The account "jobscheduler" that is the owner of the installation is exposed for later mapping. This account should be mapped at run-time to the account in the Docker Host that will mount the exposed volume.
    • Line 43: The start script is executed to launch the JobScheduler Master daemon.

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