Why "chown" followed by a COPY/ADD instruction increases the docker image size in Red Hat Enterprise Linux 7 ?

Solution Unverified - Updated -

Issue

  • Why "chown" followed by a COPY/ADD instruction increase the docker image size in Red Hat Enterprise Linux 7 ?
  • Refer the below given Dockerfile. Container image built using the below Dockerfile would be increased by another 200MB
From alpine
ADD 200mbFile 200mbFile
RUN chown root:504 200mbFile

Environment

  • Red Hat Enterprise Linux 7
  • docker-1.12-X or docker-latest-1.13.1-X

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