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Merge pull request #4576 from mitchellh/dockerdirdoc 

document docker staging directory.
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Matthew Hooker 2017-02-21 14:51:01 -08:00 committed by GitHub
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website/source/docs/builders/docker.html.md
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@ -354,3 +354,11 @@ the future:
and other metadata. Packer builds a raw Docker container image that has none
of this metadata. You can pass in much of this metadata at runtime with
`docker run`.
## Overriding the host directory
By default, Packer creates a temporary folder under your home directory, and
uses that to stage files for uploading into the container. If you would like to
change the path to this temporary folder, you can set the `PACKER_TMP_DIR`
environment variable. This can be useful, for example, if you have your home
directory permissions set up to disallow access from the docker daemon.