Volume not preserving files correctly

[ignoramous]

@verticalh

I have one file in this /data directory, data.json. data/data.json is listed in my .dockerignore file,

Interesting. I wonder if the contents of /data in docker ends up truncating / hiding contents on volume mounted at /data? See:

How to mount app directory as a persistent volume when the app starts?

Are you trying to mount a volume at /tmp? It’s probably best to mount to a different location, almost every Docker image already has a tmp directory (and we can’t mount over an existing directory).

In which case, you may have to dockerignore data/ altogether?