如何使用 docker 卷和 ubuntu 映像来访问从 AWS S3 下载的文件？

Question

I want to copy a file from AWS S3 to a local directory through a docker container. This copying command is easy without docker, I can see the file downloaded in the current directory. But the problem is with docker that I don't even know how to access the file.

Here is my Dockerfile:

FROM ubuntu
WORKDIR "/Users/ezzeldin/s3docker-test"
RUN apt-get update
RUN apt-get install -y awscli
ENV AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID
ENV AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY
CMD [ "aws", "s3", "cp", "s3://ezz-test/s3-test.py", "." ]

The current working folder that I should see the file downloaded to is s3docker-test/ . This is what I'm doing after building the Dockerfile to mount a volume myvol to the local directory

docker run -d --name devtest3 -v $PWD:/var/lib/docker/volumes/myvol/_data ubuntu

So after running the image I get this: download: s3://ezz-test/s3-test.py to./s3-test.py which shows that the file s3-test.py is already downloaded, but when I run ls in the interactive terminal I can't see it. So how can I access that file?

Answer 1

Looks like you are overriding containers folder with your empty folder, when you run -v $PWD:/var/lib/docker/volumes/myvol/_data .

Try to simply copy the files from container to host fs by running:

docker cp \
  <containerId>:/Users/ezzeldin/s3docker-test/s3-test.py \
  /host/path/target/s3-test.py

You could perform this command even on downed container. But first you will have to run it without folder override:

docker run -d --name devtest3 ubuntu