Hello,
I have a very confusing issue. In a Dockerfile, on a RUN I do an rm -r of files present in the parent image.
When userns-remap is not enabled, this works fine.
When userns-remap is enabled, the removed files reappear after the RUN is finished.
Here is a minimal dockerfile to reproduce the issue:
FROM tomcat:8.0.53-jre8
RUN set -eux; \
ls -lrt ${CATALINA_HOME}/webapps/*; \
rm -rf ${CATALINA_HOME}/webapps/*; \
ls -lrt ${CATALINA_HOME}/webapps/;
RUN ls -lrt ${CATALINA_HOME}/webapps/;
Without the userns-remap, first ls show the files, second and third do not.
With userns-remap, first ls show the files second does not, but third does show the files as well. And if starting a container with the resulting image, files are there as well.
I saw in the documentation that userns-remap is not compatible with all storage options but with no further information. I’m using overlay2 on a RHEL with docker 1.13.1
Anyone had that issue or any idea how to fix it?
Thanks.