Changing ownership of a directory/volume using linux in Dockerfile - bash

Question

I'm working on creating a Dockerfile that builds 2 volumes called /data/ and /artifacts/ and one user called "omnibo" and then assigning this user with ownership/permission of these two volumes, I tried using the chown command but after checking the volumes' permissions/ownership are assigned to root user.
This is what's in my Dockerfile script:
FROM alpine:latest
RUN useradd -m omnibo
VOLUME /data/ /artifact/
RUN chown -R omnibo /data /artifact
RUN mkdir -p /var/cache /var/cookbook
COPY fix-joyou.sh /root/joyou.sh
COPY Molsfile /var/file/Molsfile
RUN bash /root/fix-joyou.sh && rm -rf /root/fix-joyou.sh && \
yum -y upgrade && \
yum -y install curl iproute hostname && \
curl -L https://monvo.tool.sh/install.sh | bash && \
/opt/embedded/bin/gem install -N berkshelf && \
/opt/embedded/bin/berks vendor -b /var/cinc/Molsfile /var/cinc/cookbook
ENV RUBYOPT=-r/usr/local/share/ruby-docker-copy-patch.rb
USER omnibo
WORKDIR /home/omnibo
This script runs successfully when creating container but when doing "ll" it shows that these two volumes are assigned to "root", Is there anything I can do to add ownership to "omnibo"?

Answer 1

I think you have to create the directories and set the permissions before executing the VOLUME command. According to the docker documentation: "If any build steps change the data within the volume after it has been declared, those changes will be discarded". See https://docs.docker.com/engine/reference/builder/#volume
Try the following:
FROM alpine:latest
RUN useradd -m omnibo
RUN mkdir /data /artifact && chown -R omnibo /data /artifact
VOLUME /data/ /artifact/
...