leezu commented on issue #18093: CI: unify centos7_base.sh and centos7_core.sh
URL: https://github.com/apache/incubator-mxnet/pull/18093#issuecomment-615955998
 
 
   @marcoabreu having instructions in shell files is a very bad practice. This 
leads to constant docker cache invalidation and makes for a horrible 
development experience. We need to refactor all dockerfiles to get rid of the 
shell scripts. Some references:
   
   * 
https://stackoverflow.com/questions/48551953/why-does-my-docker-cache-get-invalidated-by-this-copy-command
   * Request for reason of cache invalidation: moby/moby#9294
   * COPY invalidates cache: moby/moby#21913
   * Timestamp part of hash: moby/moby#9391
   ** Fixed in moby/moby#12031
   
   Instead of using shell scripts, we can structure our Dockerfiles to have a 
base image that is shared among multiple containers, where each of the multiple 
containers is a specialization, eg for Python etc.

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