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The root directory controller
could can have any name. Consider Note that below build script listed below will, by default will , use the directory name and release number to determine the resulting image name.
The build script build.sh
and Controller start script start-controller.sh
are explained described below.
Dockerfile
Docker images for JS7 Controllers provided by SOS make use of the following Dockerfile:
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FROM openjdk:8-jre-alpine LABEL maintainer="Software- und Organisations-Service GmbH" # BUILD SETTINGS # provide build arguments for release information ARG JS_RELEASE ARG JS_RELEASE_MAJOR # default user id has to match later run-time user ARG JS_USER_ID=${JS_USER_ID:-1001} ARG JS_ID=${JS_ID:-jobscheduler} ARG JS_HTTP_INTERFACE=${JS_HTTP_INTERFACE:-0.0.0.0} ARG JS_HTTP_PORT=${JS_HTTP_PORT:-4444} ARG JS_HTTPS_INTERFACE=${JS_HTTPS_INTERFACE:-0.0.0.0} ARG JS_HTTPS_PORT=${JS_HTTPS_PORT:-4443} ARG JS_JAVA_OPTIONS=${JS_JAVA_OPTIONS} # RUN-TIME SETTINGS # JS7 Controller ID, ports and Java options ENV RUN_JS_ID=${RUN_JS_ID:-$JS_ID} ENV RUN_JS_HTTP_INTERFACE=${RUN_JS_HTTP_INTERFACE:-$JS_HTTP_INTERFACE} ENV RUN_JS_HTTP_PORT=${RUN_JS_HTTP_PORT:-$JS_HTTP_PORT} ENV RUN_JS_HTTPS_INTERFACE=${RUN_JS_HTTPS_INTERFACE:-$JS_HTTPS_INTERFACE} ENV RUN_JS_HTTPS_PORT=${RUN_JS_HTTPS_PORT} ENV RUN_JS_JAVA_OPTIONS=${RUN_JS_JAVA_OPTIONS:-$JS_JAVA_OPTIONS} # PREPARATION # install process tools, net tools, bash RUN apk update && apk add --no-cache \ procps \ net-tools \ bash # setup working directory RUN mkdir -p /var/sos-berlin.com/js7 WORKDIR /var/sos-berlin.com/js7 # add/copy installation tarball ADD https://download.sos-berlin.com/JobScheduler.${JS_RELEASE_MAJOR}/js7_controller_unix.${JS_RELEASE}.tar.gz /usr/local/src/ # COPY js7_controller_unix.${JS_RELEASE}.tar.gz /usr/local/src/ # add start script COPY start-controller.sh /usr/local/bin/ # INSTALLATION # extract installation tarball # for JDK < 12, /dev/random does not provide sufficient entropy, see https://kb.sos-berlin.com/x/lIM3 # add jobscheduler user account and make it the owner of directories RUN adduser -u ${JS_USER_ID:-1001} --disabled-password --home /home/jobscheduler --no-create-home --shell /bin/bash jobscheduler jobscheduler && \ test -e /usr/local/src/js7_controller_unix.${JS_RELEASE}.tar.gz && \ tar xfvz /usr/local/src/js7_controller_unix.${JS_RELEASE}.tar.gz -C /var/sos-berlin.com/js7/ && \ rm /usr/local/src/js7_controller_unix.${JS_RELEASE}.tar.gz && \ chown -R jobscheduler:jobscheduler /var/sos-berlin.com && \ chmod +x /usr/local/bin/start-controller.sh && \ sed -i 's/securerandom.source=file:\/dev\/random/securerandom.source=file:\/dev\/urandom/g' /usr/lib/jvm/java-1.8-openjdk/jre/lib/security/java.security # CONFIGURATION # copy configuration # COPY config/ /var/sos-berlin.com/js7/controller/var/config/ # CODA # run-time user, can be overwritten when running the container USER jobscheduler CMD ["sh","-c","/usr/local/bin/start-controller.sh --id=\"$RUN_JS_ID\" --http-port=$RUN_JS_HTTP_INTERFACE:$RUN_JS_HTTP_PORT --https-port=$RUN_JS_HTTPS_INTERFACE:$RUN_JS_HTTPS_PORT --java-options=\"$RUN_JS_JAVA_OPTIONS\""] |
ExplanationsExplanation:
- Line 1: The base image is OpenJDK Java 1.8 (Alpine based). You can run Controllers with newer Java releases, however, stick to Oracle, OpenJDK or AdoptOpenJDK as the source for your Java base image. Alternatively you can use your own base image and install Java 1.8 on top of this.
- Line 8 - 9: The release identification is injected by build arguments. This information is used to determine the tarball to be downloaded.
- Line 12 - 18: Defaults for the Controller ID and user id running the Controller inside the container as well as HTTP and HTTPS ports are provided. These values can be overwritten by providing the respective build arguments.
- Line 23 - 28: 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 33 - 36: The image OS is updated and additional packages are installed (ps, netstat, bash, vi).
- Line 43 - 44: You can either download the Controller tarball directly from the SOS web site or you store the tarball with the build directory and copy from this location.
Line 47: The
start-controller.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:Code Block language bash title Controller Start Script linenumbers true collapse true #!/bin/sh js_id="" js_http_port="" js_https_port="" js_java_options="" for option in "$@" do case "$option" in --id=*) js_id=`echo "$option" | sed 's/--id=//'` ;; --http-port=*) js_http_port=`echo "$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=//'` ;; *) echo "unknown argument: $option" exit 1 ;; esac done js_args="" if [ ! "$js_http_port" = "" ] && [ ! "$js_http_port" = ":" ] then js_args="$js_args --http-port=$js_http_port" fi if [ ! "$js_https_port" = "" ] && [ ! "$js_https_port" = ":" ] then js_args="$js_args --https-port=$js_https_port" fi if [ ! "$js_java_options" = "" ] then js_args="$js_args --java-options=$js_java_options" fi echo "starting Controller: /var/sos-berlin.com/js7/controller/bin/controller.sh start --id=$js_id $js_args" /var/sos-berlin.com/js7/controller/bin/controller.sh start --id=$js_id $js_args && tail -f /dev/null
- Line 54 - 59: The user account
jobscheduler
is created and is assigned the user id and group id handed over by the respective build arguments. This translates to the fact that the account running the Controller inside the container and the account that starts the container are assigned the same user id and group id. This allows the account running the container to access any files created by the Controller in mounted volumes with identical permissions. - Line 60: Java releases < Java 12 make use of
/dev/random
for random number generation. This is a bottleneck as random number generation with this file is blocking. Instead/dev/urandom
should be used that implements non-blocking behavior. The change of the random file is applied to the Java security file. - Line 65: if a
config
folder is available in the build directory then its contents is copied to the respectiveconfig
folder in the image. This can be useful to create an image with individual settings in configuration files, see JS7 - Controller Configuration Items. - Line 72: The start script is executed and is dynamically parameterized from environment variables that are forwarded when starting the container.
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#!/bin/sh set -e SCRIPT_HOME=$(dirname "$0") SCRIPT_HOME="`cd "${SCRIPT_HOME}" >/dev/null && pwd`" SCRIPT_FOLDER="`basename $(dirname "$SCRIPT_HOME")`" # ----- modify default settings ----- JS_RELEASE="2.0.0-SNAPSHOT" JS_REPOSITORY="sosberlin/js7" JS_IMAGE="$(basename "${SCRIPT_HOME}")-${JS_RELEASE//\./-}" JS_USER_ID="$UID" JS_ID="jobscheduler" JS_HTTP_PORT="4444" JS_HTTPS_PORT="4443" JS_JAVA_OPTIONS="-Xmx500m" 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=//'` ;; --id=*) JS_ID=`echo "$option" | sed 's/--id=//'` ;; --http-port=*) JS_HTTP_PORT=`echo "$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_ID=$JS_ID" \ --build-arg="JS_HTTP_PORT=$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 |
ExplanationsExplanation:
- Line 12 - 23: 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 the release of JS7 that you want to build a Controller for.
- 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 by default is the user id of the user running the build script.
- the Controller ID can be specified that is a unique identifier for a Controller installation.
- the HTTP port and HTTPS port: if the respective port is not specified then the Controller will not listen to a port for the respective protocol. 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 host. However, you can modify ports as you like.
- Java options: typically you would specify default values e.g. for Java memory consumption. The Java options can be overwritten by the run script when starting the container, however, you might want to create your own image with adjusted default values.
- Line 28 - 53: 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 --id=js7-prod --http-port=14445 --https-port=14443 --java-options="-Xmx1G"
- Line 60 - 71: The effective
docker build
command is executed with arguments. The Dockerfile is assumed to be located with thebuild
sub-directory of the current directory.
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