We were using Docker-in-Docker in our cluster to run user-defined containers, and something about it resulted in the outer container disk usage blowing up to li

We were using Docker-in-Docker in our cluster to run user-defined containers, and something about it resulted in the outer container disk usage blowing up to like 20GiB per container. I think something due to the overlay filesystem driver. We were under a time constraint so we just grew all the host root filesystems, but it was pretty inconvenient and not inexpensive to do so. I have to assume this also had a drastic negative impact on storage I/O performance in the inner container as well.