Do Dockerfile WORKDIR, ENTRYPOINT, VOLUME … apply to child images?

I want to create two Docker images, one being the child of the other. But I don’t know if the properties (such as WORKDIR, ENTRYPOINT , VOLUME, …) I specified in the parent will apply to child.

For example if I have these two images with these two Dockerfiles :

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    • myrepo/webapp-build

      FROM ruby:2.2.3
      
      RUN mkdir -p /app
      WORKDIR /app
      
      COPY Gemfile Gemfile.lock ./
      RUN gem install bundler && bundle install
      
      VOLUME /app
      ENTRYPOINT ["bundle", "exec"]
      
    • myrepo/webapp

      FROM myrepo/webapp-build
      
      COPY . ./
      
      EXPOSE 3000
      
      CMD ["rails", "server", "-b", "0.0.0.0"]
      

    Will the second image copy the files into /app ? Will my entrypoint in the second image be bundle exec ?

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  • One Solution collect form web for “Do Dockerfile WORKDIR, ENTRYPOINT, VOLUME … apply to child images?”

    Those properties do propagate from one base image to another using said base image (with a FROM directive).

    But regarding WORKDIR, it is better to repeat it in order to document what ‘.’ means in a COPY . xxx

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.