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Inline Dockerfile Caching

If you don't already know, there is no feature like "RUN NOCACHE" or "ALWAYS" as you can check in this feature request on github

And there I've found 2 beautiful workarounds that works like a charm!

Example 1:


thaJeztah commented on 18 Jan 2016
@c9s try this instead

FROM foo
ARG CACHE_DATE=2016-01-01
RUN git clone ...
docker build --build-arg CACHE_DATE=$(date) ....

Example 2:


CheRuisiBesares commented on 6 Aug 2014
So I was struggling with this issue for a while and I just wanted to share my work around incase its helpful while this gets sorted out. I really didn't want to add anything outside of the docker file to the build invocation or change the file every time. Anyway this is a silly example but it uses the add mechanism to bust the cache and doesn't require any file manipulations.

From ubuntu:14.04

RUN apt-get -yqq update
RUN apt-get -yqq install git
RUN git clone https://github.com/coreos/fleet
ADD http://www.random.org/strings/?num=10&len=8&digits=on&upperalpha=on&loweralpha=on&unique=on&format=plain&rnd=new uuid
RUN cd fleet && git pull
Obviously you can pick your own use case and network random gen. Anyway maybe it will help some people out idk.

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An Inline Dockerfile no-caching workaround solutions found at issue https://github.com/moby/moby/issues/1996

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