挂载的主机文件成为 docker 容器内的目录

Question

I mount a host file into a docker container, and the mounted file becomes a directory inside the container. That's how I run it:

$ docker run --name <containername> -it -d -v /home/core/account_config.py:/code/account_config.py  <imagename>

Inside the container:

    # ls -la
    -rw-r--r--. 4 root root     0 Nov  6 10:25 __init__.py
    drwxr-xr-x. 2 root root  4096 Nov  6 10:59 account_config.py
    ....

The file (in the host file system) is still a perfectly ok python file.

The source code is added into /code during build. The corresponding line in my Dockerfile is:

ADD ./code /code

I want to be able to change the content of config file without rebuilding the image, so I want mount it later. What went wrong and how can I fix this?

Answer 1

As it happens with (almost) every weird issue, turned out that this one has a very simple solution.

The path to host file contained a typo, so the docker automatically created a directory in this path, and mounted it to the container.

Answer 2

如果您希望能够修改主机上的文件并使更改反映在容器中，则应在run -v HOST_PATH:CONTAINER_PATH时通过-v HOST_PATH:CONTAINER_PATH挂载卷。