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uberrebu
Asked: 2016-10-11 13:00:40 +0800 CST

create data container from another docker image

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I have a docker image that is about 900MB it has a directory /data where all the data i want are in and also a /data/.git directory that i will like to exclude.

I will like to create a data container(using busybox image for example) with only the data under the /data excluding the /data/.git directory

How do i do this in the most efficient way?

The /data excluding the /data/.git is only about 130MB

So basically i will have data container having roughly 130MB to 200MB compared to the other docker image that is 900MB huge

Thanks

linux busybox docker containers

1 Answers

  1. Best Answer

    I'd migrate to a named volume, and create it with the following:

    docker run -it --rm -v data-vol:/target your_image \
  /bin/bash -c "cp -av /data/* /target"

    The cp -av /data/* /target will ignore all of the dot files, so you may need to add others manually if you have more than just the ".git", e.g. cp -av /data/* /data/.app-files /target

    If you're willing to first create it with a full copy of /data and then delete the .git folder later, that's even easier:

    docker run -it --rm -v data-vol:/data your_image rm -rf /data/.git

    As long as "data-vol" has not been initialized, it will be created with the full /data contents by Docker. And then the first command you run is to clean the ".git" folder.

    Once you have the "data-vol" volume, you can reused it in another other container with:

    docker run -v data-vol:/data another_image
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