Question 223020 in Docker Question posted in
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Second docker image is overriding the first image

I am trying to create a dockerfile that will have image 1 and image 2 pulled from dockerhub. It seems that second image is overriding the changes of first image. How to handle this scenario.

FROM clamav/clamav:1.1
COPY clamd.conf /etc/clamav
EXPOSE 3310/tcp
RUN echo $(ls -ltrh var/log) # this is showing the appname as the result
FROM fluent/fluentd:v1.14-1
COPY fluent.conf /fluentd/etc/
RUN echo $(ls -ltrh var/log) # now this is showing no result, empty directory.
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2

Answers


  1. Chosen as BEST ANSWER
    0

    @pgossa, what about this one. maybe not a good approach as you mentioned but will it work? just a thought.

    FROM fluent/fluentd:v1.14-1 AS fluentd
COPY fluent.conf /fluentd/etc/

FROM clamav/clamav:1.1
COPY clamd.conf /etc/clamav
COPY --from=fluentd /fluentd /fluentd
EXPOSE 3310/tcp

  2. 0

    The second FROM instructions is pulling a new image(fluentd) which delete the changes made in your first one(clamav).
    If you want to create 2 images then you need 2 dockerfile.
    And so split your file in two.

    If you are planning on having only one image containing both applications, your dockerfile should look something like this:

    FROM fluentd:v1.16.0-debian-1.0
COPY fluent.conf /fluentd/etc/
RUN apt install clamav clamav-daemon -y
COPY clamd.conf /etc/clamav

EXPOSE 3310/tcp
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