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I am trying to write a simple dockerfile that wraps around a bash script. The docker file looks like this: 

FROM openjdk:8-jre-alpine COPY . /build/demo WORKDIR /build/demo/ RUN pwd; ls RUN chmod +x run-demo.sh RUN run-demo.sh 1 zk

and the context file directory (slimmed down) looks like:

  • Dockerfile
  • build
    • demo
      • run-demo.sh

I have a step RUN pwd; ls which outputs 

RUN pwd; ls ---> Running in f22ce9175cee /build/demo run-demo.sh

and yet once the docker build . reaches the last command, it says /bin/sh: run-demo.sh: not found. How is that possible? Thank you

edit: and the script begins with !#/bin/bash if thats relevant edit2:

RUN pwd; ls -l ---> Running in 16fbda2c19e1 /build/demo -rwxr-xr-x 1 root root 775 Jun 12 21:14 run-demo.sh Removing intermediate container 16fbda2c19e1 ---> bf8ada47953a Step 7/7 : RUN ./run-demo.sh 1 zk ---> Running in daccefe3c895 /bin/sh: ./run-demo.sh: not found
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2 Answers 2

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I have solved it. openjdk:8-jre-alpine, my base image, does not pack bash

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To run a program directly, as you are trying, it must be in one of the directories listed in the PATH variable. To run a file elsewhere you need to explicitly provide the path to it, as in either ./run-demo.sh or /build/demo/run-demo.sh.

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  • This was how I first wrote my docker file, it has no effect on the error Commented Jun 13, 2018 at 15:54
  • I added an edit to the question Commented Jun 13, 2018 at 16:12

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