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Problem

We recently ran into a situation whereby some of our server instances were suddenly running out of disc space, evidenced by below graph:

this fast

The reason for running out of disc space is a single /tmp/magick-??? file, that grows into a 4GB monster within minutes.

System setup

To give some background into our system, we run a big rails app which uses mini_magick 4.7.1 and carrier_wave ~0.11.0 to perform product image uploads via background jobs.

Observations

We naturally expected image uploads to accrue some temporary files during the server's life span, which could be salvaged by running CarrierWave.clean_cached_files! periodically.

Is there something we could've missed?

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