Docker - 如何将文件从图像复制到主机? [英] Docker - how can I copy a file from an image to a host?
问题描述
我的问题与关于从以下位置复制文件的这个问题有关容器到主机；我有一个 Dockerfile，它获取依赖项，从源代码编译构建工件，并运行一个可执行文件.我还想复制构建工件(在我的情况下，它是由 sbt dist 在 '../target/` 中生成的 .zip，但我认为这个问题也适用到罐子、二进制文件等.
My question is related to this question on copying files from containers to hosts; I have a Dockerfile that fetches dependencies, compiles a build artifact from source, and runs an executable. I also want to copy the build artifact (in my case it's a .zip produced by sbt dist in '../target/`, but I think this question also applies to jars, binaries, etc.
docker cp 适用于容器，而不是图像；我是否需要启动一个容器才能从中取出文件?在脚本中，我尝试在后台以交互模式运行 /bin/bash，将文件复制出来，然后杀死容器，但这似乎很笨拙.有没有更好的办法?
docker cp works on containers, not images; do I need to start a container just to get a file out of it? In a script, I tried running /bin/bash in interactive mode in the background, copying the file out, and then killing the container, but this seems kludgey. Is there a better way?
另一方面，我想避免在运行 docker save $IMAGENAME 后解压 .tar 文件只是为了取出一个文件(但这似乎是最简单的，如果最慢，现在的选项).
On the other hand, I would like to avoid unpacking a .tar file after running docker save $IMAGENAME just to get one file out (but that seems like the simplest, if slowest, option right now).
我会使用 docker 卷，例如:
I would use docker volumes, e.g.:
docker run -v hostdir:out $IMAGENAME /bin/cp/../blah.zip /out
但我在 OSX 中运行 boot2docker 并且我不知道如何直接写入我的 mac 主机文件系统(读写卷安装在我的 boot2docker VM 中，这意味着我可以't 与他人轻松共享从图像中提取 blah.zip 的脚本.有想法吗?
but I'm running boot2docker in OSX and I don't know how to directly write to my mac host filesystem (read-write volumes are mounting inside my boot2docker VM, which means I can't easily share a script to extract blah.zip from an image with others. Thoughts?
推荐答案
要从图像复制文件，请创建一个临时容器，从中复制文件，然后将其删除:
To copy a file from an image, create a temporary container, copy the file from it and then delete it:
id=$(docker create image-name)
docker cp $id:path - > local-tar-file
docker rm -v $id
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