removing what was added in previous layer in docker -

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I am trying to reduce the size of my docker image in my Docker file, I do this: 

  Crystal / Centes Maintainer Crystal AdD ./rpms/test.rpm/rpms/ RUN from yum -y --nogpgcheck localinstall / rpms / test From Rpm I understand that the ADD command is in its own layer, and then the run is in another layer, so after installing RPM, I started the initial  / rpms   
 
 
 Use this technique  < Pre>  run curl http: // someaddress / test.rpm & amp; Amp; Amp; \ Yum -y --nogpgcheck localinstall /rpms/test.rpm & amp; \ Rm test.rpm

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