issue with following the instructions in the README.md and using the `USER` command in the Dockerfile about node-red-docker

[jthomas]

Thanks for the detailed feedback and persevering with this!
I'll have a detailed review of the above next week and get back to you.

[jthomas]

I'm managed to re-create this issue locally using the information you've left above.
If you would be happy to send a PR with the updated README that would be amazing!

Thanks for digging into this!

[vielmetti]

I'm running into this on CoreOS, and apparently either tickling a bug or exposing the limits of my understanding of that system when I try to invoke Docker with --user core.

[vielmetti]

It wasn't a bug, but I did have to change my CoreOS Dockerfile to resolve this; I'm now doing something like this:

https://github.com/syntechdev/node-red-docker/blob/v0.0.3-coreos/coreos/Dockerfile#L16

RUN adduser -h /usr/src/node-red -D -H -u 500 core \
    && chown -R core:core /data \
    && chown -R core:core /usr/src/node-red

i.e. in the container running as the "core" user, and specifically setting the UID of that user to match the UID of the "core" user in the underlying filesystem, so that I can properly access the filesystem. (Eventually that file system will be Amazon EFS.) So far so good.