Removing what was added in previous layer in docker

use this technique

RUN curl http://someaddress/test.rpm &&\
    yum -y --nogpgcheck localinstall /rpms/test.rpm &&\
    rm test.rpm

you cannot remove data from previous layers. If the /rpms/ folder is huge and you absolutely don't want its data in your docker image you have at least two solutions:

1. do not ADD the data (since it will commit a layer), instead use a single RUN instruction to:
   • download the rpm file
   • install the rpm file
   • delete the rpm file
2. flatten your image afterwards