Dockerfile 文件路径 : what does the colon mean?

Question

在 Dockerfiles 和 docker-compose 文件中，我经常偶然发现两种符号。

docker 撰写示例:

volumes:
      - ./app/:/usr/src/app/

示例 Dockerfile

COPY ./Pipfile /usr/src/app/Pipfile

第二种方法是，从我的机器目录 ./Pipfile 中获取文件/文件夹并将其复制到目录/usr/... 中的图像中？但是第一个是什么意思？

谢谢。

Answer 1

如果是 bind mount

-v or --volume: Consists of three fields, separated by colon characters (:).
The fields must be in the correct order, and the meaning of each field is not immediately obvious.

• In the case of bind mounts, the first field is the path to the file or directory on the host machine.
• The second field is the path where the file or directory is mounted in the container.
• The third field is optional, and is a comma-separated list of options, such as ro, consistent, delegated, cached, z, and Z. These options are discussed below.

如果是 命名卷 : 第一个字段是卷的名称 , 并且在给定的主机上是唯一的。对于匿名卷，省略第一个字段。

这里:第一个参数是路径，/app/: 所以绑定(bind)挂载它是。