Hi Maxim,
thanks for your answer.
I tried redirecting passengers tmp dir as well using the tmp_dir directive as well as using the env variables. For the "regular" passenger tmp files, this seems to work fine (they appear in the new location).
My main problem is that I can't even see the file that is using up so much space in the /tmp dir and am quite frankly at a loss how that is even possible.
Anyways. Thanks for your help. I'll try to dig into the passenger config a little more.
Tim