Table of Contents

Introduction

This article explains a simplified build process for describes the build process for official JOC Cockpit images that is extracted from the SOS build environment.
Users can build their own Docker container images for JOC Cockpit and adjust to their needs.

Build Environment

For the build environment the The following directory hierarchy is assumed for the build environment:

joc
- build.sh
- build
  - Dockerfile
  - entrypoint.sh
  - jetty.sh
  - jocjs7_install.xmlstart-_joc.sh
  - config

The The joc root directory joc can have any name. The build files listed above are available for download. Note that the build script described below will, by default, use the directory name and release number to determine the resulting image name.

Dockerfile

Download: Dockerfile

Docker Container images for JS7 JOC Cockpit provided by SOS make use of the following Dockerfile:

Code Block

language	bash
title	Dockerfile for JOC Cockpit Image
linenumbers	true
collapse	true

# BUILD PRE-IMAGE

FROM alpine:latest3.17 AS js7-pre-image

# provide build arguments for release information
ARG JS_RELEASE
ARG JS_RELEASE_MAJOR

# add installer archive file
ADD https://download.sos-berlinimage user id has to match later run-time user id
ARG JS_USER_ID=${JS_USER_ID:-1001}
ARG JS_HTTP_PORT=${JS_HTTP_PORT:-4446}
ARG JS_HTTPS_PORT=${JS_HTTPS_PORT:-4443}
ARG JS_JAVA_OPTIONS=${JS_JAVA_OPTIONS}

# add/copy installation tarball
# ADD https://download.sos-berlin.com/JobScheduler.${JS_RELEASE_MAJOR}/js7_joc_linux.${JS_RELEASE}.tar.gz /usr/local/src/
# COPY js7_joc_linux.${JS_RELEASE}.tar.gz /usr/local/src/

RUN# test installer tarball
RUN test -e /usr/local/src/js7_joc_linux.${JS_RELEASE}.tar.gz && \

# add/copy installer script
# tarADD zxvf https:/usr/local/src/js7_joc_linux/download.sos-berlin.com/JobScheduler.${JS_RELEASE_MAJOR}.tar.gz -C /js7_install_joc.sh /usr/local/srcbin/ && \
    rm -f COPY js7_install_joc.sh /usr/local/src/js7_joc_linux.${JS_RELEASE}.tar.gzbin/

# copy installer response file, entrypoint script and start script
COPY joc_install.xml configuration
COPY config/ /usr/local/src/resources
COPY entrypoint.sh /usr/local/src/
COPY start-joc.sh /usr/local/src/

# copy configuration
COPY config/ /usr/local/src/resources

# BUILD IMAGE

FROM alpine:latest AS js7-image

LABEL maintainer="Software- und Organisations-Service GmbH"

# provide build arguments for release information
ARG JS_RELEASE
ARG JS_RELEASE_MAJOR

# image user id has to match later run-time user id
ARG JS_USER_ID=
# install Java and JOC Cockpit
#   create user account jobscheduler using root group
RUN apk update && apk add --no-cache \
    openjdk11 && \
    adduser -u ${JS_USER_ID:-1001}
ARG JS_HTTP_PORT=${JS_HTTP_PORT:-4446}
ARG JS_HTTPS_PORT=${JS_HTTPS_PORT:-4443}
ARG JS_JAVA_OPTIONS=${JS_JAVA_OPTIONS}

# JS7 user id, ports and Java options
ENV RUN_JS_USER_ID=${RUN_JS_USER_ID:-1001}
ENV RUN_JS_HTTP_PORT=${RUN_JS_HTTP_PORT:-$JS_HTTP_PORT}
ENV RUN_JS_HTTPS_PORT=${RUN_JS_HTTPS_PORT:-$JS_HTTPS_PORT}
ENV RUN_JS_JAVA_OPTIONS=${RUN_JS_JAVA_OPTIONS:-$JS_JAVA_OPTIONS}

COPY --from=js7-pre-image ["/usr/local/src", "/usr/local/src"]

# INSTALLATION

# install process tools, net tools, bash, openjdk
# add jobscheduler user account and group
# for JDK < 12, /dev/random does not provide sufficient entropy, see https://kb.sos-berlin.com/x/lIM3
# substitute build arguments in installer response file
# run setup
RUN apk update && apk add --no-cache-G root --disabled-password --home /home/jobscheduler --shell /bin/bash jobscheduler && \
    chmod +x /usr/local/bin/js7_install_joc.sh && \
    /usr/local/bin/js7_install_joc.sh \
        --home=/opt/sos-berlin.com/js7/joc \
        --data=/var/sos-berlin.com/js7/joc \
        --setup-dir=/usr/local/src/joc.setup \
        --tarball=/usr/local/src/js7_joc_linux.${JS_RELEASE}.tar.gz \
        --http-port="${JS_HTTP_PORT}" \
        --https-port="${JS_HTTPS_PORT}" \
        --dbms-init=off \
        --dbms-config=/usr/local/src/resources/hibernate.cfg.xml \
    procps \
    net-tools--keystore=/usr/local/src/resources/https-keystore.p12 \
    bash \
    shadow--keystore-password=jobscheduler \
    openjdk8 && \
    adduser -u ${JS_USER_ID:-1001} --disabled-password --home /home/jobscheduler --shell /bin/bash jobscheduler jobscheduler && -truststore=/usr/local/src/resources/https-truststore.p12 \
        --truststore-password=jobscheduler \
        --user=jobscheduler \
    ln  -s /usr/local/src/joc.${JS_RELEASE} /usr/local/src/joc && \
 --title="JOC Cockpit" \
       mv /usr/local/src/joc_install.xml /usr/local/src/joc/ && \
 --as-user \
        --java-options="${JS_JAVA_OPTIONS}" \
     mv /usr/local/src/resources/hibernate.cfg.xml /usr/local/src/joc/   --make-dirs && \
    sedrm -if 's/securerandom.source=file:\/dev\/random/securerandom.source=file:\/dev\/urandom/g' /usr/lib/jvm/java-1.8-openjdk/jre/lib/security/java.security && \
    sed -i "s/\s*<entry\s*key\s*=\"jettyPort\".*\/>/<entry key=\"jettyPort\" value=\"$JS_HTTP_PORT\"\/>/g" /usr/local/src/joc/joc_install.xml && \
    cd /usr/local/src/joc && ./setup.sh -u joc_install.xml && \
    mv /usr/local/src/entrypoint.sh /usr/local/bin/ && \
    mv /usr/local/src/start-joc.sh /usr/local/bin/ && \
    chmod +x /usr/local/bin/entrypoint.sh /usr/local/bin/start-joc.sh && \
    mv /usr/local/src/resources/* /var/sos-berlin.com/js7/joc/resources/joc/ && \
    cat /usr/local/src/js7_joc_linux.${JS_RELEASE}.tar.gz

# BUILD IMAGE

FROM alpine:3.17 AS js7-image

LABEL maintainer="Software- und Organisations-Service GmbH"

# provide build arguments for release information
ARG JS_RELEASE
ARG JS_RELEASE_MAJOR

# image user id has to match later run-time user id
ARG JS_USER_ID=${JS_USER_ID:-1001}
ARG JS_HTTP_PORT=${JS_HTTP_PORT:-4446}
ARG JS_HTTPS_PORT=${JS_HTTPS_PORT:-4443}
ARG JS_JAVA_OPTIONS=${JS_JAVA_OPTIONS}

# JS7 user id, ports and Java options
ENV RUN_JS_USER_ID=${RUN_JS_USER_ID:-1001}
ENV RUN_JS_HTTP_PORT=${RUN_JS_HTTP_PORT:-$JS_HTTP_PORT}
ENV RUN_JS_HTTPS_PORT=${RUN_JS_HTTPS_PORT:-$JS_HTTPS_PORT}
ENV RUN_JS_JAVA_OPTIONS=${RUN_JS_JAVA_OPTIONS:-$JS_JAVA_OPTIONS}

COPY --from=js7-pre-image ["/opt/sos-berlin.com/js7", "/opt/sos-berlin.com/js7"]
COPY --from=js7-pre-image ["/var/sos-berlin.com/js7/joc/resources/joc/start.ini.add >> ", "/var/sos-berlin.com/js7/joc/start.ini && \
    cat /var"]

# copy entrypoint script
COPY entrypoint.sh /usr/local/bin/
COPY jetty.sh /opt/sos-berlin.com/js7/joc/resourcesjetty/joc/joc.properties.add >> /var/bin/

# install process tools, net tools, bash, openjdk
# add jobscheduler user account and group
# for JDK < 12, /dev/random does not provide sufficient entropy, see https://kb.sos-berlin.com/js7/joc/resources/joc/joc.propertiesx/lIM3
RUN apk update && apk add --no-cache \
    procps sed\
 -i "s/\s*jetty.ssl.port\s*=.*/jetty.ssl.port=$JS_HTTPS_PORT/g" /var/sos-berlin.com/js7/joc/start.ini   net-tools \
    bash \
    su-exec \
    shadow \
    git \
    openjdk11 && \
    javased -jari "/opt/sos-berlin.com/js7/joc/jetty/start.jar" -Djetty.home="/opt/sos-berlin.com/js7/joc/jetty" -Djetty.base="/var/sos-berlin.com/js7/joc" --add-to-start=https 's/securerandom.source=file:\/dev\/random/securerandom.source=file:\/dev\/urandom/g' /usr/lib/jvm/java-11-openjdk/conf/security/java.security && \
    sed mv-i /var/sos-berlin.com/js7/joc/start.ini /var/sos-berlin.com/js7/joc/resources/joc/'s/jdk.tls.disabledAlgorithms=SSLv3, RC4, DES, MD5withRSA, DH keySize < 1024, \\/jdk.tls.disabledAlgorithms=SSLv3, RC4, DES, MD5withRSA, DH keySize < 1024, TLSv1, TLSv1.1, \\/g' /usr/lib/jvm/java-11-openjdk/conf/security/java.security && \
    lnadduser -s /var/sos-berlin.com/js7/joc/resources/joc/start.iniu ${JS_USER_ID} -G root --disabled-password --home /home/jobscheduler --shell /bin/bash jobscheduler && \
    mkdir -p /var/log/sos-berlin.com/js7/joc/start.ini && \
    chown -R jobscheduler:jobschedulerroot /varopt/sos-berlin.com

# START

ENTRYPOINT ["sh", "/usr/local/bin/entrypoint.sh"]

CMD ["/usr/local/bin/start-joc.sh", "--http-port=$RUN_JS_HTTP_PORT", "--https-port=$RUN_JS_HTTPS_PORT", "--java-options=\"$RUN_JS_JAVA_OPTIONS\""/var/sos-berlin.com /var/log/sos-berlin.com/js7/joc && \
    chmod -R g=u /etc/passwd /opt/sos-berlin.com /var/sos-berlin.com /var/log/sos-berlin.com/js7/joc && \
    chmod +x /usr/local/bin/entrypoint.sh /opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh

# START

ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

Explanation:

The build script Dockerfile implements two stages to exclude installer files from the resulting image.
Line 3: The base image is the current Alpine image at build-time.
Line 6 - 7: The release identification is injected by build arguments. This information is used to determine the tarball to be downloaded or copied.
Line 10 - 11: You can either download 13: Defaults for the user id running the JOC Cockpit inside the container as well as HTTP and HTTPS ports are provided. These values can be overwritten by providing the relevant build arguments.
Line 16 - 17: Users can either download the JOC Cockpit tarball directly from the SOS web site or store the tarball tarball directly from the SOS web site or you store the tarball with the build directory and copy from this location.
Line 13 - 1520: The The tarball integrity is extractedtested.
Line 18: the joc_install.xml response file is copied to the image. This file includes settings for headless installation of JOC Cockpit, see JS7 - JOC Cockpit Installation On Premises. In fact when building the image a JOC Cockpit installation is performed. Code Block
language xml
title JOC Cockpit Installer Response File
linenumbers true
collapse true
<?xml version="1.0" encoding="UTF-8" standalone="no"?>  <AutomatedInstallation langpack="eng"> <com.izforge.izpack.panels.UserInputPanel id="home"> <userInput/> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.HTMLLicencePanel id="gpl_licence"/> <com.izforge.izpack.panels.TargetPanel id="target">  <installpath>/opt/sos-berlin.com/js7/joc</installpath> </com.izforge.izpack.panels.TargetPanel> <com.izforge.izpack.panels.UserInputPanel id="jetty"> <userInput>  <entry key="withJettyInstall" value="yes"/> <entry key="jettyPort" value="4446"/> <!-- Specify the name of the Windows service or Linux Daemon (default: joc). Only necessary for multiple instances of JOC on one server. It must be unique per server. This entry is deactivated by a comment because it23 - 24: The JOC Cockpit Installer Script is downloaded or copied, see JS7 - Unix Shell Installation Script - js7_install_joc.sh
Line 27: The config folder available in the build directory is copied to the appropriate config folder in the image. This can be useful for creating an image with individual settings in configuration files, see the JS7 - JOC Cockpit Configuration Items article for more information.
- The hibernate.cfg.xml specifies the database connection. This file is not used at build-time. However, it is provided as a sample for run-time configuration. You will find details in the JS7 - Database article.
- The default https-keystore.p12 and https-truststore.p12 files are copied that would hold the private key and certificate required for server authentication with HTTPS. By default empty keystore and truststore files are used that users would add their private keys and certificates to at run-time.
Line 32: A recent Java release is added to the pre-image.
Line 33: The jobscheduler account is created.
Line 35 - 52: The JOC Cockpit Installer Script is executed with arguments performing installation for the jobscheduler account. For use of arguments see headless installation of the JOC Cockpit, see JS7 - JOC Cockpit Installation On Premises. In fact a JOC Cockpit installation is performed when building the image
Line 72 - 75: Environment variables are provided at run-time, not at build-time. They can be used to specify ports and Java options when running the container.
Line 81: The entrypoint.sh script is copied from the build directory to the image, see next chapter.
Line 82: The jetty.sh script is copied from the build directory to the image. This script ships with the Jetty Servlet Container and for on premises installations is available from the JETTY_HOME/bin directory. Users might have to adjust the script to strip off commands that require root permissions, for example chown, and commands that might not be applicable to their container environment, for example use of su.
Line 87 - 93: The image OS is updated and additional packages are installed (ps, netstat, bash, git).
Line 94: The most recent Java 11 package available with Alpine is applied. JOC Cockpit can be operated with newer Java releases. However, stick to Oracle, OpenJDK or AdoptOpenJDK as the source for your Java LTS release. Alternatively you can use your own base image and install Java on top of this. For details see Which Java versions is JobScheduler available for?
Line 95: Java releases might make use of /dev/random for random number generation. This is a bottleneck as random number generation with this file is blocking. Instead /dev/urandom should be used that implements non-blocking behavior. The change of the random file is applied to the Java security file.
Line 96: Users might want to disable certain TLS protocol versions or algorithms by applying changes to the Java security file.
Line 97 - 100: The jobscheduler account is created and is assigned the user id handed over by the relevant build argument. This suggests that the account running the JOC Cockpit inside the container and the account that starts the container are assigned the same user id. This allows the account running the container to access any files created by the JOC Cockpit in mounted volumes with identical permissions.
- Consider that the account is assigned the root group. For environments in which the entrypoint script is executed with an arbitrary non-root user id this allows access to files created by the JOC Cockpit provided to any accounts that are assigned the root group.
- Accordingly any files owned by the jobscheduler account are made accessible to the root group with similar user permissions. Read access to /etc/passwd can be required in such environments.
- For details see JS7 - Running Containers for User Accounts.
Line 105: The entrypoint script is executed and is dynamically parameterized from environment variables which are forwarded when starting the container.

Entrypoint Script

Download: entrypoint.sh

The following entrypoint script is used to start JOC Cockpit containers.

Code Block

language	bash
title	JOC Cockpit Entrypoint Script
linenumbers	true
collapse	true

#!/bin/sh #!/bin/bash

JETTY_HOME="/opt/sos-berlin.com/js7/joc/jetty"
JETTY_BASE="/var/sos-berlin.com/js7/joc"

update_joc_properties() {
  # update joc.properties file: ${JETTY_BASE}/resources/joc/joc.properties
  rc=$(grep -E '^cluster_id' "${JETTY_BASE}/resources/joc/joc.properties")
  if [ -z "${rc}" ]
  then
    echo "updating cluster_id in ${JETTY_BASE}/resources/joc/joc.properties"
    printf "cluster_id = joc\n" >> "${JETTY_BASE}/resources/joc/joc.properties"
  fi

  rc=$(grep -E '^ordering' "${JETTY_BASE}/resources/joc/joc.properties")
  if [ -z "${rc}" ]
  then
    echo "updating ordering in ${JETTY_BASE}/resources/joc/joc.properties"
    printf "ordering=$(shuf -i 0-99 -n 1)\n" >> "${JETTY_BASE}/resources/joc/joc.properties"
  fi
}

startini_to_startd() {
  # convert once ${JETTY_BASE}/resources/joc/start.ini to ${JETTY_BASE}/resources/joc/start.d
  if [ -d "${JETTY_BASE}/start.d" ]; then
    if [ -f "${JETTY_BASE}/resources/joc/start.ini" ] && [ -d "${JETTY_BASE}/resources/joc/start.d" ]; then
      echo "convert start.ini to start.d ini files"
      for file in "${JETTY_BASE}"/resources/joc/start.d/*.ini; do
        module="$(basename "$file" | cut -d. -f1)"
        echo "processing module ${module}"
        while read -r line; do

...

 modulevariablekeyprefix="$(echo "${line}" | cut -d. -f1,2)"

...

  if [ "${modulevariablekeyprefix}" = "jetty.${module}" ] || [ "${modulevariablekeyprefix}" = "jetty.${module}Context" ]; then

...

modulevariablekey="

...

$(echo "${line}" | cut -d= -f1 | sed 's/\s*$//g')"

...

echo "${line}"
            sed

...

-i "s;.*${modulevariablekey}\s*=.*;${line};g" "${file}"
          fi

...

done

...

< "${JETTY_BASE}/resources/joc/start.ini"
      done
      mv

...

-f

...

"${JETTY_BASE}/resources/joc/start.ini" "${JETTY_BASE}/resources/joc/start.in~"
    fi
  fi
}

add_start_configuration() {
  # overwrite ini

...

files in start.d if available from config folder
  if [ -d "${JETTY_BASE}/start.d" ]; then
    if [ -d "${JETTY_BASE}/resources/joc/start.d" ]; then
      for file in "${JETTY_BASE}"/resources/joc/start.d/*.ini; do

...

echo

...

"copy ${file} -> ${JETTY_BASE}/start.d/"
        cp

...

-f "$file"

...

"${JETTY_BASE}/start.d/"
      done

...

fi
  fi
}

add_jdbc_and_license() {
  # if license folder not empty then copy js7-license.jar to Jetty's class path
  if [

...

-d "${JETTY_BASE}/resources/joc/license" ]; then
    if [ -f "${JETTY_BASE}/resources/joc/lib/js7-license.jar"

...

]; then
      echo

...

"copy ${JETTY_BASE}/resources/joc/lib/js7-license.jar -> ${JETTY_BASE}/lib/ext/joc/"
      cp

...

-f "${JETTY_BASE}/resources/joc/lib/js7-license.jar" "${JETTY_BASE}/lib/ext/joc/"
    fi
  fi
  # if JDBC driver added

...

then copy to Jetty's class path and move exiting JDBC drivers back to avoid conflicts
  if [ -d "${JETTY_BASE}/resources/joc/lib" ]; then
    if [ -n "$(ls "${JETTY_BASE}"/resources/joc/lib/*.jar 2>/dev/null | grep

...

v "js7-license.jar")" ]; then
      for file in "${JETTY_BASE}"/lib/ext/joc/*.jar; do
        if [

...

"$(basename "$file")" != "js7-license.jar" ]; then

...

echo "move ${file} -> ${JETTY_BASE}/resources/joc/lib/$(basename "$file")~"
          mv

...

-f "$file" "${JETTY_BASE}/resources/joc/lib/$(basename "$file")~"
        fi
      done
      for

...

file in "${JETTY_BASE}"/resources/joc/lib/*.jar; do
        echo "copy

...

${file} -> ${JETTY_BASE}/lib/ext/joc/"
        cp

...

-f "$file"

...

"${JETTY_BASE}/lib/ext/joc/"
      done

...

fi
  fi
}

add_custom_logo() {
  # if image folder in the configuration directory is not empty then images are copied to the installation directory
  if [ -d "${JETTY_BASE}"/resources/joc/image ];then

...

mkdir -p  "${JETTY_BASE}/webapps/root/ext/images"
    echo

...

"copy ${JETTY_BASE}/resources/joc/image/* -> ${JETTY_BASE}/webapps/root/ext/images/"

...

cp "${JETTY_BASE}"/resources/joc/image/* "${JETTY_BASE}/webapps/root/ext/images/"
  fi
}

patch_jars() {
  if [ -d "${JETTY_BASE}"/resources/joc/patches ]; then
    # "extract patch files if exist"
    ls "${JETTY_BASE}"/resources/joc/patches/*.jar 2>/dev/null
    if [ -n "$(ls "${JETTY_BASE}"/resources/joc/patches/*.jar 2>/dev/null)" ]; then
      if [ -d "${JETTY_BASE}/webapps/joc/WEB-INF/classes" ]; then

...

cd

...

"${JETTY_BASE}/webapps/joc/WEB-INF/classes" > /dev/null || exit
        for

...

file in "${JETTY_BASE}"/resources/joc/patches/*.jar; do
          echo "extract ${file} -> ${JETTY_BASE}/webapps/joc/WEB-INF/classes"
          unzip

...

-o

...

"${file}"
        done

...

cd

...

> /dev/null || exit
      fi
    fi
  fi
}

# create Jetty start

...

script
echo "#!/bin/sh" > "${JETTY_BASE}"/start-joc.sh
echo "/opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh start && tail -f /dev/null" >> "${JETTY_BASE}"/start-joc.sh
chmod +x "${JETTY_BASE}"/start-joc.sh

# update joc.properties file
update_joc_properties

# start.ini_to_startd
add_start_configuration

# copy custom logo
add_custom_logo


if [ -n "${RUN_JS_HTTP_PORT}" ]
then
  if [ -f "${JETTY_BASE}/start.d/http.in~" ] && [ ! -f "${JETTY_BASE}/start.d/http.ini" ]; then
    # enable http access in start.d directory
    mv "${JETTY_BASE}/start.d/http.in~" "${JETTY_BASE}/start.d/http.ini"
  fi
  if [ -f "${JETTY_BASE}/start.d/http.ini" ]; then
    # set port for http access in start.d directory
    sed -i "s/.*jetty.http.port\s*=.*/jetty.http.port=$RUN_JS_HTTP_PORT/g" "${JETTY_BASE}/start.d/http.ini"
  fi
else
  if [ -f "${JETTY_BASE}/start.d/http.ini" ]; then
    # disable http access in start.d directory
    mv -f "${JETTY_BASE}/start.d/http.ini" "${JETTY_BASE}/start.d/http.in~"
  fi
fi

if [ -n "${RUN_JS_HTTPS_PORT}" ]
then
  if [ -f "${JETTY_BASE}/start.d/https.in~" ] && [ ! -f "${JETTY_BASE}/start.d/https.ini" ]; then
    # enable https access in start.d directory
    mv "${JETTY_BASE}/start.d/https.in~" "${JETTY_BASE}/start.d/https.ini"
  fi
  if [ -f "${JETTY_BASE}/start.d/ssl.in~" ] && [ ! -f "${JETTY_BASE}/start.d/ssl.ini" ]; then
    # enable https access in start.d directory
    mv "${JETTY_BASE}/start.d/ssl.in~" "${JETTY_BASE}/start.d/ssl.ini"
  fi
  if [ -f "${JETTY_BASE}/start.d/ssl.ini" ]; then
    # set port for https access in start.d directory
    sed -i "s/.*jetty.ssl.port\s*=.*/jetty.ssl.port=${RUN_JS_HTTPS_PORT}/g" "${JETTY_BASE}/start.d/ssl.ini"
  fi
else
  if [ -f "${JETTY_BASE}/start.d/https.ini" ]; then
    # disable https access in start.d directory
    mv -f "${JETTY_BASE}/start.d/https.ini" "${JETTY_BASE}/start.d/https.in~"
  fi
  if [ -f "${JETTY_BASE}/start.d/ssl.ini" ]; then
    # disable https access in start.d directory
    mv -f "${JETTY_BASE}/start.d/ssl.ini" "${JETTY_BASE}/start.d/ssl.in~"
  fi
fi

if [ -n "${RUN_JS_JAVA_OPTIONS}" ]
then
  export JAVA_OPTIONS="${JAVA_OPTIONS} ${RUN_JS_JAVA_OPTIONS}"
fi

JS_USER_ID=$(echo "${RUN_JS_USER_ID}" | cut -d ':' -f 1)
JS_GROUP_ID=$(echo "${RUN_JS_USER_ID}" | cut -d ':' -f 2)

JS_USER_ID=${JS_USER_ID:-$(id -u)}
JS_GROUP_ID=${JS_GROUP_ID:-$(id -g)}

BUILD_GROUP_ID=$(cat /etc/group | grep jobscheduler | cut -d ':' -f 3)
BUILD_USER_ID=$(cat /etc/passwd | grep jobscheduler | cut -d ':' -f 4)

add_jdbc_and_license
patch_jars

if [ "$(id -u)" = "0" ]
then
  if [ ! "${BUILD_USER_ID}" = "${JS_USER_ID}" ]
  then
    echo "JS7 entrypoint script switching ownership of image user id '${BUILD_USER_ID}' -> '${JS_USER_ID}'"
    usermod -u "${JS_USER_ID}" jobscheduler
    find /var/sos-berlin.com/ -user "${BUILD_USER_ID}" -exec chown -h jobscheduler {} \;
    find /var/log/sos-berlin.com/ -user "${BUILD_USER_ID}" -exec chown -h jobscheduler {} \;
  fi

  if [ ! "${BUILD_GROUP_ID}" = "${JS_GROUP_ID}" ]
  then
    if grep -q "${JS_GROUP_ID}" /etc/group
    then
      groupmod -g "${JS_GROUP_ID}" jobscheduler
    else
      addgroup -g ${JS_GROUP_ID} -S jobscheduler
    fi

    echo "JS7 entrypoint script switching ownership of image group id '${BUILD_GROUP_ID}' -> '${JS_GROUP_ID}'"
    find /var/sos-berlin.com/ -group "${BUILD_GROUP_ID}" -exec chgrp -h jobscheduler {} \;
    find /var/log/sos-berlin.com/ -group "${BUILD_GROUP_ID}" -exec chgrp -h jobscheduler {} \;
  fi

  echo "JS7 entrypoint script switching to user account 'jobscheduler' to run start script"
  echo "JS7 entrypoint script starting JOC Cockpit: exec su-exec ${JS_USER_ID}:${JS_GROUP_ID} /opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh start"
  exec su-exec "${JS_USER_ID}":"${JS_GROUP_ID}" "${JETTY_BASE}"/start-joc.sh
else
  if [ "${BUILD_USER_ID}" = "${JS_USER_ID}" ]
  then
    if [ "$(id -u)" = "${JS_USER_ID}" ]
    then
      echo "JS7 entrypoint script running for user id '$(id -u)'"
    else
      echo "JS7 entrypoint script running for user id '$(id -u)' using user id '${JS_USER_ID}', group id '${JS_GROUP_ID}'"
      echo "JS7 entrypoint script missing permission to switch user id and group id, consider to omit the 'docker run --user' option"
    fi
  else
    echo "JS7 entrypoint script running for user id '$(id -u)', image user id '${BUILD_USER_ID}' -> '${JS_USER_ID}', image group id '${BUILD_GROUP_ID}' -> '${JS_GROUP_ID}'"
  fi

  echo "JS7 entrypoint script starting JOC Cockpit: exec sh -c /opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh start"
  exec sh -c "${JETTY_BASE}/start-joc.sh"
fi

Explanation:

Note that the entrypoint script runs the JOC Cockpit start script using exec sh -c. This is required to run the JOC Cockpit inside the current process that is assigned PID 1. A later docker stop <container> command will send a SIGTERM signal to the process with PID 1 only. If JOC Cockpit were started directly as a shell script without use of exec then a new process with a different PID would be created. This means that the docker stop command would not normally terminate JOC Cockpit, but would abort JOC Cockpit when killing the container. This can cause delays for fail-over between clustered JOC Cockpit containers

public PGP keys are stored for verification only all signing will be done externally outside of JOC Cockpit MEDIUM: a private PGP key will be stored for signing signing will be done automatically with the provided key LOW: no keys will be stored signing will be done internally with default keys --> <entry key="securityLevel" value="LOW"/> </userInput> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.UserInputPanel id="database"> <userInput>   <entry key="databaseConfigurationMethod" value="withoutHibernateFile"/>  <entry key="databaseDbms" value="mysql"/>  <entry key="hibernateConfFile" value=""/>  <entry key="databaseCreateTables" value="off"/> </userInput> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.UserInputPanel id="dbconnection"> <userInput>   <entry key="databaseHost" value=""/>  <entry key="databasePort" value=""/>  <entry key="databaseSchema" value=""/>  <entry key="databaseUser" value=""/>  <entry key="databasePassword" value=""/> </userInput> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.UserInputPanel id="jdbc"> <userInput>    <entry key="internalConnector" value="yes"/>  <entry key="connector" value=""/> </userInput> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.UserInputPanel id="end"> <userInput/> </com.izforge.izpack.panels.UserInputPanel> <com.izforge.izpack.panels.InstallPanel id="install"/> <com.izforge.izpack.panels.ProcessPanel id="process"/> <com.izforge.izpack.panels.FinishPanel id="finish"/> </AutomatedInstallation>

Line 19: The entrypoint.sh script is copied from the build directory to the image. Users can apply their own version of the entrypoint script. The entrypoint script used by SOS looks like this:
Download: entrypoint.sh

Code Block

language	bash
title	JOC Cockpit Start Script
linenumbers	true
collapse	true

#!/bin/sh

JS_USER_ID=`echo $RUN_JS_USER_ID | cut -d ':' -f 1`
JS_GROUP_ID=`echo $RUN_JS_USER_ID | cut -d ':' -f 2`

BUILD_GROUP_ID=`cat /etc/group | grep jobscheduler | cut -d ':' -f 3`
BUILD_USER_ID=`cat /etc/passwd | grep jobscheduler | cut -d ':' -f 4`

if [ "$(id -u)" = "0" ]
then
  if [ ! "$BUILD_USER_ID" = "$JS_USER_ID" ]
  then
    echo "JS7 entrypoint script preparing switch of image user id '$BUILD_USER_ID' -> '$JS_USER_ID', group id '$BUILD_GROUP_ID' -> '$JS_GROUP_ID'"
    usermod -u $JS_USER_ID jobscheduler
    groupmod -g $JS_GROUP_ID jobscheduler
    find /var/sos-berlin.com/ -group $BUILD_GROUP_ID -exec chgrp -h jobscheduler {} \;
    find /var/sos-berlin.com/ -user $BUILD_USER_ID -exec chown -h jobscheduler {} \;
    find /var/log/sos-berlin.com/ -group $BUILD_GROUP_ID -exec chgrp -h jobscheduler {} \;
    find /var/log/sos-berlin.com/ -user $BUILD_USER_ID -exec chown -h jobscheduler {} \;
  fi

  echo "JS7 entrypoint script switching to user account 'jobscheduler' to run start script"
  exec su jobscheduler -c "$*"
else
  if [ "$BUILD_USER_ID" = "$JS_USER_ID" ]
  then
    if [ "$(id -u)" = "$JS_USER_ID" ]
    then
      echo "JS7 entrypoint script running for user id '$(id -u)'"
    else
      echo "JS7 entrypoint script running for user id '$(id -u)' cannot switch to user id '$JS_USER_ID', group id '$JS_GROUP_ID'"
      echo "JS7 entrypoint script missing permission to switch user id and group id, consider to omit the 'docker run --user' option"
    fi
  else
    echo "JS7 entrypoint script running for user id '$(id -u)' cannot switch image user id '$BUILD_USER_ID' -> '$JS_USER_ID', group id '$BUILD_GROUP_ID' -> '$JS_GROUP_ID'"
    echo "JS7 entrypoint script missing permission to switch user id and group id, consider to omit the 'docker run --user' option"
  fi

  exec sh -c "$*"
fi

Line 20: The start-joc.sh script is copied from the build directory to the image. Users can apply their own version of the start script. The start script used by SOS looks like this:
Download: start-joc.sh

Code Block

language	bash
title	JOC Cockpit Start Script
linenumbers	true
collapse	true

#!/bin/sh

js_http_port=""
js_https_port=""
js_java_options=""

for option in "$@"
do
  case "$option" in
         --http-port=*)    js_http_port=`echo "$option" | sed 's/--http-port=//'`
                           ;;
         --https-port=*)   js_https_port=`echo "$option" | sed 's/--https-port=//'`
                           ;;
         --java-options=*) js_java_options=`echo "$option" | sed 's/--java-options=//'`
                           ;;
         *)                echo "unknown argument: $option"
                           exit 1
                           ;;
  esac
done


js_args=""

if [ ! "$js_http_port" = "" ]
then
  # enable http access
  sed -i "s/.*--module=http$/--module=http/g" /var/sos-berlin.com/js7/joc/start.ini
  # set port for http access
  sed -i "s/.*jetty.http.port\s*=.*/jetty.http.port=$js_http_port/g" /var/sos-berlin.com/js7/joc/start.ini
else
  # disable http access
  sed -i "s/\s*--module=http$/# --module=http/g" /var/sos-berlin.com/js7/joc/start.ini
fi

if [ ! "$js_https_port" = "" ]
then
  # enable https access
  sed -i "s/.*--module=https$/--module=https/g" /var/sos-berlin.com/js7/joc/start.ini
  # set port for https access
  sed -i "s/\s*jetty.ssl.port\s*=.*/jetty.ssl.port=$js_https_port/g" /var/sos-berlin.com/js7/joc/start.ini
else
  # disable https access
  sed -i "s/\s*--module=https$/# --module=https/g" /var/sos-berlin.com/js7/joc/start.ini
fi

if [ ! -z "$js_java_options" ]
then
  export JAVA_OPTIONS="${JAVA_OPTIONS} $js_java_options"
fi

echo "starting JOC Cockpit: /opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh start"
/opt/sos-berlin.com/js7/joc/jetty/bin/jetty.sh start && tail -f /dev/null

Line 23: The config folder available in the build directory is copied to the respective config folder in the image. This can be useful to create an image with individual settings in configuration files, see JS7 - JOC Cockpit Configuration Items.
- The hibernate.cfg.xml specifies the database connection. This file is not used at build-time, however, it is provided as a sample for run-time configuration. Find details from the JS7 - Database article.
- The default https-keystore.p12 and https-truststore.p12 files are copied that would hold the private key and certificate required for server authentication with HTTPS. By default empty keystore and truststore files are used that at run-time users would add their private keys and certificates to.
Line 36 - 39: Defaults for the user id running the JOC Cockpit inside the container as well as HTTP and HTTPS ports are provided. These values can be overwritten by providing the respective build arguments.
Line 42 - 45: Environment variables are provided at run-time, not at build-time. They can be used to specify ports and Java options when running the container.
Line 56 - 59: The image OS is updated and additional packages are installed (ps, netstat, bash).
Line 61: The most recent Java 1.8 package available with Alpine is applied. JOC Cockpit can be operated with newer Java releases, however, stick to Oracle, OpenJDK or AdoptOpenJDK as the source for your Java LTS release. Alternatively you can use your own base image and install Java 1.8 or later on top of this.
Line 62: The user account jobscheduler is created and is assigned the user id and group id handed over by the respective build arguments. This translates to the fact that the account running the JOC Cockpit inside the container and the account that starts the container are assigned the same user id and group id. This allows the account running the container to access any files created by the JOC Cockpit in mounted volumes with identical permissions.
Line 66: Java releases < Java 12 make use of /dev/random for random number generation. This is a bottleneck as random number generation with this file is blocking. Instead /dev/urandom should be used that implements non-blocking behavior. The change of the random file is applied to the Java security file.
Line 68: The JOC Cockpit setup is performed.

Line 73 - 74: The keystore and truststore locations are added to the Jetty start.ini file and joc.properties file respectively.

start.ini.add is used for access e.g. by client browsers:

Code Block

language	bash
title	Jetty HTTPS Configuration File start.ini.add
linenumbers	true
collapse	true

## Keystore file path (relative to $jetty.base)
jetty.sslContext.keyStorePath=resources/joc/https-keystore.p12

## Truststore file path (relative to $jetty.base)
jetty.sslContext.
trustStorePath=resources/joc/https-truststore.p12

## Keystore password
jetty.sslContext.keyStorePassword=jobscheduler

## KeyManager password (same as keystore password for pkcs12 keystore type)
jetty.sslContext.keyManagerPassword=jobscheduler

## Truststore password
jetty.sslContext.trustStorePassword=jobscheduler

## Connector port to listen on
jetty.ssl.port=4443

joc.properties.add is used for connections to the Controller should such connections require HTTPS mutual authentication:

Code Block

language	bash
title	JOC Cockpit configuration File joc.properties.add
linenumbers	true
collapse	true

################################################################################
### Location, type and password of the Java truststore which contains the
### certificates of eachJobScheduler Controller for HTTPS connections. Path can be
### absolute or relative to this file.

keystore_path = ../../resources/joc/https-keystore.p12
keystore_type = PKCS12
keystore_password = jobscheduler
key_password = jobscheduler

truststore_path = ../../resources/joc/https-truststore.p12
truststore_type = PKCS12
truststore_password = jobscheduler

Line 75: The Jetty servlet container is added the HTTPS module for use with JOC Cockpit.
Line 82-84: The entry script and start script is executed and is dynamically parameterized from environment variables that are forwarded when starting the container.

Build Script

The build script offers a number of options to parameterize the Dockerfile:

Code Block

language	bash
title	Build Script for JOC Cockpit Image
linenumbers	true
collapse	true

#!/bin/sh

set -e

SCRIPT_HOME=$(dirname "$0")
SCRIPT_HOME="`cd "${SCRIPT_HOME}" >/dev/null && pwd`"
SCRIPT_FOLDER="`basename $(dirname "$SCRIPT_HOME")`"


# ----- modify default settings -----

JS_RELEASE="2.05.0-SNAPSHOT"
JS_REPOSITORY="sosberlin/js7"
JS_IMAGE="$(basename "${SCRIPT_HOME}")-${JS_RELEASE//\./-}"

JS_USER_ID="$UID"

JS_HTTP_PORT="4446"
JS_HTTPS_PORT=

JS_JAVA_OPTIONS="-Xmx128m"
JS_BUILD_ARGS=

# ----- modify default settings -----


for option in "$@"
do
  case "$option" in
         --release=*)      JS_RELEASE=`echo "$option" | sed 's/--release=//'`
                           ;;
         --repository=*)   JS_REPOSITORY=`echo "$option" | sed 's/--repository=//'`
                           ;;
         --image=*)        JS_IMAGE=`echo "$option" | sed 's/--image=//'`
                           ;;
         --user-id=*)      JS_USER_ID=`echo "$option" | sed 's/--user-id=//'`
                           ;;
         --http-port=*)    JS_HTTP_PORT=`echo "$option" | sed 's/--http-port=//'`
                           ;;
         --https-port=*)   JS_HTTPS_PORT=`echo "$option" | sed 's/--https-port=//'`
                           ;;
         --java-options=*) JS_JAVA_OPTIONS=`echo "$option" | sed 's/--java-options=//'`
                           ;;
         --build-args=*)   JS_BUILD_ARGS=`echo "$option" | sed 's/--build-args=//'`
                           ;;
         *)                echo "unknown argument: $option"
                           exit 1
                           ;;
  esac
done

set -x

docker build --no-cache --rm \
      --tag=$JS_REPOSITORY:$JS_IMAGE \
      --file=$SCRIPT_HOME/build/Dockerfile \
      --build-arg="JS_RELEASE=$JS_RELEASE" \
      --build-arg="JS_RELEASE_MAJOR=$(echo $JS_RELEASE | cut -d . -f 1,2)" \
      --build-arg="JS_USER_ID=$JS_USER_ID" \
      --build-arg="JS_HTTP_PORT=$JS_HTTP_PORT" \
      --build-arg="JS_HTTPS_PORT=$JS_HTTPS_PORT" \
      --build-arg="JS_JAVA_OPTIONS=$JS_JAVA_OPTIONS" \
      $JS_BUILD_ARGS $SCRIPT_HOME/build

set +x

...

Line 12 - 22: Default values are specified that are used if no command line arguments are provided. This includes values for:
- the release number: adjust this value to a current release of JS7.
- the repository which by default is sosberlin:js7.
- the image name is determined from the current folder name and the release number.
- the user id is by default the user id of the user running the build script.
- the HTTP port and HTTPS port: if the respective relevant port is not specified then the JOC Cockpit will not listen to a that port for the respective protocol in question. You can, for example, disable the HTTP protocol by specifying an empty value. The default ports should be fine as they are mapped by the run script to outside ports on the Docker container's host. However, you can modify ports as you like.
- Java options: typically you would specify default values e.g. for for, for example, Java memory consumption. The Java options can be overwritten by the run script when starting the container, however. However, you might want to create your own image with adjusted default values.
Line 27 - 50: The above options can be overwritten by command line arguments like this:
Code Block
language bash
title Running the Build Script with Arguments
linenumbers true
./build.sh --http-port=14445 --https-port=14443 --java-options="-Xmx1G"
Line 54 - 63: The effective docker build command is executed with arguments. The Dockerfile is assumed to be located with the build sub-directory of the current directory.

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