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docs: explain when RUN cache gets invalidated 

This adds a few lines to the RUN Dockerfile docs to explain how to
bypass the RUN caching and how ADD can also invalidate the cache for
these instructions.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
master
unclejack 2014-05-15 11:56:23 +03:00 committed by Tibor Vass
parent 6a55530c56
commit 4fe816bff2
1 changed files with 10 additions and 0 deletions
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10
docs/sources/reference/builder.md
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@ -131,6 +131,16 @@ any point in an image's history, much like source control.
The *exec* form makes it possible to avoid shell string munging, and to `RUN`
commands using a base image that does not contain `/bin/sh`.
The cache for `RUN` instructions isn't invalidated automatically during the
next build. The cache for an instruction like `RUN apt-get dist-upgrade -y`
will be reused during the next build.
The cache for `RUN` instructions can be invalidated by using the `--no-cache`
flag, for example `docker build --no-cache`.
The first encountered `ADD` instruction will invalidate the cache for all
following instructions from the 'Dockerfile' if the contents of the context
have changed. This will also invalidate the cache for `RUN` instructions.
### Known Issues (RUN)
- [Issue 783](https://github.com/dotcloud/docker/issues/783) is about file