Docker如何在不将其提交到映像的情况下添加文件？ [英] Docker how to ADD a file without committing it to an image?

问题描述

我有一个〜300Mb的压缩本地文件，我将其添加到docker映像中。然后，下一个状态将提取图像。

I have a ~300Mb zipped local file that I add to a docker image. The next state then extracts the image.

问题是ADD语句导致提交，该提交导致新的文件系统层使图像比图像大300Mb。

The problem is that the ADD statement results in a commit that results in a new file system layer makes the image ~300Mb larger than it needs to be.

ADD /files/apache-stratos.zip /opt/apache-stratos.zip
RUN unzip -q apache-stratos.zip && \
    rm apache-stratos.zip && \
    mv apache-stratos-* apache-stratos

问题：是否存在一种解决方法，可以在不引起提交的情况下添加本地文件？

Question: Is there a work-around to ADD local files without causing a commit?

一种选择是运行简单的Web服务器（例如 python -m SimpleHTTPServer ），然后启动docker build，然后使用 wget 检索文件，但这似乎有些混乱：

One option is to run a simple web server (e.g. python -m SimpleHTTPServer) before starting the docker build, and then using wget to retrieve the file, but that seems a bit messy:

RUN wget http://localhost:8000/apache-stratos.zip && \
    unzip -q apache-stratos.zip && \
    rm apache-stratos.zip && \
    mv apache-stratos-* apache-stratos

另一种方法是提取在容器启动时而不是在构建时压缩文件，但我希望保持启动尽可能快。

Another option is to extract the zipped file at container start up instead of build time, but I would prefer to keep the start up as quick as possible.

推荐答案

根据文档，如果您从本地文件系统（而非URL）添加到Dockerfile中（带有目标路径，而不是路径+文件名），它将把文件解压缩到给定的目录中。

According to the documentation, if you pass an archive file from the local filesystem (not a URL) to ADD in the Dockerfile (with a destination path, not a path + filename), it will uncompress the file into the directory given.

如果< src>是本地tar归档文件，且压缩格式为
（身份，gzip，bzip2或xz），则将其解压缩为目录。
来自远程URL的资源未解压缩。复制或解压缩目录
时，其行为与tar -x相同：结果为
，并集为：

If <src> is a local tar archive in a recognized compression format (identity, gzip, bzip2 or xz) then it is unpacked as a directory. Resources from remote URLs are not decompressed. When a directory is copied or unpacked, it has the same behavior as tar -x: the result is the union of:

1）目标路径上存在的任何内容；以及2）
源树的内容，已解决冲突以支持 2。

1) Whatever existed at the destination path and 2) The contents of the source tree, with conflicts resolved in favor of "2." on a file-by-file basis.

尝试：

ADD /files/apache-stratos.zip /opt/

看看文件是否在那里，而无需进一步解压缩。

and see if the files are there, without further decompression.

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