defining resource limitation and using volumes in dockerfile?

Question

Is there is any option for defining resource limitation in Dockerfile?

then how to define already created volume for specific folder in container ??

I cannot using my volumes in Dockerfile , it creates new volumes with random id for each run

Answer 1

Resource limitations in the Dockerfile: no. The Dockerfile defines the steps for building the image; resource constraints are applied when you run a container from the image.

You can create volumes which contain data in the image - but you need to create the files first and then expose the volume. Build from this Dockerfile:

FROM ubuntu
RUN mkdir -p /var/app && echo 'saved' > /var/app/file1
VOLUME /var/app
RUN mkdir -p /var/app && echo 'not saved' > /var/app/file2

And the image will contain file1 but not file2:

> docker run --rm temp  ls /var/app                                                                             
file1

For the reason, see the answer to this question.