我如何安装docker容器文件系统？

Question

How would I mount docker container images so that I could modify them with external tools ?

This means: from the docker hosts, mounting the image without launching a container on it, as a normal filesystem. I should'nt need to run a container for this.

I'd like to update the image directly this way, then probably send something like docker commit . With lxc tools (in ubuntu for example) its quite easy as it is directly available to host in /var/lib/lxc/MYCONTAINER/rootfs .

I know about workarounds, but:

• I don't feel that using Dockerfile context (and ADD ) is rather convenient nor adapted: I don't have a specific directory to send, but rather would use a combination of tools to change only specific files (think of rsync for instance).
• Even if ADD contains some sort of algorithm that only adds new files to the image appropriately, I still have to send all files as docker context for the build command !.
• I could update the container image by calling tools pre-installed in the image. But apt-get install git on a debian image doubles the size of the image. And git won't be used in production. And removing tools after usage is not always so easy, besides that it feels wrong.
• I could use -v docker build's option to mount a directory full of tools... and their dependencies. This feels hard if you need more than a very simple bash-script.

Answer 1

在你的情况下，我会运行一个容器（我知道你反对这个）然后，例如rsync文件到/ var / lib / docker / devicemapper / mnt / CONTAINERID / rootfs，然后是docker commit。