Does Docker use UnionFS, and does it cause "fallocate:: Operation not supported"?

Hi Sergey. Thanks for trying out the kubernetes environment part, that’s what I don’t know.

> I tested fallocate [in an overlay2 filesystem-using case] - worked fine for me.

Thanks. So I guess we should rule out that it was just overlay2 fs alone. At most, it might be overlay2 filesystem in combination with transient resource failure such as a lack of memory.

Or … maybe it was overlay 1-not-2. I’ll ask the community user Stef for the docker info as well.