Dockerfile 中的 Docker VOLUME 命令未按预期工作

Question

FROM ubuntu:15.04
RUN mkdir -p /app/tina
RUN touch /app/tina/foo.txt
RUN echo "testing tina" > /app/tina/foo.txt
VOLUME /app/tina
CMD sh

根据 Docker 指南

This Dockerfile results in an image that causes docker run to create a new mount point at /app/tina and copy the foo.txt file into the newly created volume

但是当我这样做的时候

docker run --rm -it -v /tmp/foo:/app/tina imagename sh
ls /app/tina/

我在里面找不到 foo.txt。

Answer 1

来自 https://docs.docker.com/engine/reference/builder/#volume

The VOLUME instruction creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers.

您正在使用/tmp/foo 这是一个目录，而不是一个卷。尝试:

docker volume create my-vol
docker run --rm -it -v my-vol:/app/tina imagename ls /app/tina/