构建Docker映像期间无法访问卷 [英] Can't access a volume during building a docker image

问题描述

我正在尝试创建一个名为 example的卷的Docker容器，其中包含一些文件，但是在构建期间无法访问它。这是我正在使用的文件：

I am trying to create a docker container with a volume called 'example', which has some files inside it, but I can't access it during build. Here are the files I am using:

# docker-compose.yml
version: "3"
services:
  example:
    build: .
    volumes:
      - "./example:/var/example"
    stdin_open: true
    tty: true

并且：

# Dockerfile
FROM ubuntu
RUN ls /var/example
CMD ["/bin/bash"]

当我运行时：

sudo docker-compose up

它给了我一个错误：

ls: cannot access /var/example: No such file or directory

但是当我从Dockerfile中删除RUN命令并运行 sudo docker-compose up ，然后运行：

But when I delete the RUN command from the Dockerfile and run sudo docker-compose up again, and then run:

docker exec -it c949eef14fcd /bin/bash # c949eef14fcd is the id of the created container
ls /var/example

...在另一个终端窗口中，没有错误，我可以看到示例目录的所有文件。为什么？

... in another terminal window, there is no error, and I can see all the files of the example directory. Why?

推荐答案

对不起，我刚刚发现在构建过程中无法访问卷。在容器运行过程中可以访问它们，在第9点中 >。但是，当我将Dockerfile更改为此：

Sorry, I have just found out that volumes are not accessible during build. They are accessible during run of the container, which is said here in the point 9. But when I changed my Dockerfile to this:

# Dockerfile
FROM ubuntu:14.04
CMD ["ls", "/var/example"]

...它工作得很好并打印了所有示例文件夹中的文件。

... it worked perfectly well and printed out all the files inside the example folder.

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