Converting Shell Script to Dockerfile

I have Java app and want to generate docker image, I have shell script like this:

#!/bin/sh

java -version

export APPLICATION_DIR=$PWD

for rJarFile in `ls ${APPLICATION_DIR}/lib/*.jar`
do
        export CLASSPATH=$rJarFile:$CLASSPATH
done

export CLASSPATH=$APPLICATION_DIR/classes:$CLASSPATH

java -Xverify:none -Xmx2048m -Djava.awt.headless=true -DFI_IS_CONFIGSER=N -DFICLIENT_APP_PATH=${APPLICATION_DIR} -DFI_APP_NAME=FIONLINE -DFI_BASE_INSTANCE_ID=1 -DPRODUCT_BOOTSTRAP_FILE=${APPLICATION_DIR}/data/BootstrapFile.properties -DFEBA_SYS_PATH=${APPLICATION_DIR}/data

And I try to convert it into Dockerfile like this

# FROM openjdk:8
FROM openjdk:11

RUN javac -version

# Create app directory
WORKDIR /usr/src/app

# Bundle app source
COPY . .

ENV APPLICATION_DIR=/usr/src/app

RUN echo $APPLICATION_DIR

RUN for rJarFile in `ls ${APPLICATION_DIR}/lib/*.jar`; do export CLASSPATH=$rJarFile:$CLASSPATH; done

RUN echo $CLASSPATH

ENV $CLASSPATH=$APPLICATION_DIR/classes:$CLASSPATH

# Run app
ENTRYPOINT ["java", "-Xverify:none", "-Xmx2048m", "-Djava.awt.headless=true", "-DFI_IS_CONFIGSER=N", "-DFICLIENT_APP_PATH=${APPLICATION_DIR} -DFI_APP_NAME=FIONLINE -DFI_BASE_INSTANCE_ID=1", "-DPRODUCT_BOOTSTRAP_FILE=${APPLICATION_DIR}/data/BootstrapFile.properties", "-DFEBA_SYS_PATH=${APPLICATION_DIR}/data"]

It can be generated, but there’s an error when I try to run it like this:

Error response from daemon: OCI runtime create failed: container_linux.go:370: starting container process caused: process_linux.go:459: container init caused: setenv: invalid argument: unknown

I’ve also changed this script RUN for rJarFile in `ls ${APPLICATION_DIR}/lib/*.jar`; do export into this RUN for rJarFile in ls ${APPLICATION_DIR}/lib/*.jar; do export CLASSPATH=$rJarFile:$CLASSPATH; done, but none of them working. I don’t want to make Dockerfile execute the script. Below is logs when i generate and run it.

Answer

You cannot update the classpath as you do with:

ENV $CLASSPATH=$APPLICATION_DIR/classes:$CLASSPATH

instead you can do

ENV CLASSPATH=$APPLICATION_DIR/classes:$CLASSPATH

Also – please consider moving the script into a separate shell script and adding into the container. This would greatly simplify the Dockerfile, for example:

# FROM openjdk:8
FROM openjdk:11

RUN javac -version

# Create app directory
WORKDIR /usr/src/app

# Bundle app source
COPY . .

ENV APPLICATION_DIR=/usr/src/app

RUN echo $APPLICATION_DIR

ENTRYPOINT ["/usr/src/app/start_java.sh"]

and keep your existing script inside start_java.sh

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Answer