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For several websites (Craft CMS 2 & 3), servers ran out ot storage even if these websites were not storing a lot of assets.

After looking for why, I ended up in the temporary (tmp/) folder of these servers (which is at a lower level of these vhosts), where I found there were a lot of Craft-related filed that were not purged.

These are, for example:

  • Imagick files (some of them have a size of ~500 Mb!)
  • A lot of Twig PHP folders and files (which content looks very similar as found in /storage/runtime/)

Questions:

  • When and why these files are generated?
  • Why they are not automatilcally deleted?
  • When is it safe to delete them?

To be more specific:

  • Because I'm using Imgix, front-end image transforms are delegated to this remote service;
  • In this case, I think that only the CP uses Imagick;
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Imagick uses the /tmp folder by default, but you can change it: https://github.com/ImageMagick/ImageMagick/issues/399#issuecomment-285793433

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  • Thank you Brad. Would you mind to answer to this important point → When is it safe to delete them?
    – Romain P.
    Commented Feb 14, 2020 at 10:23
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    Generally speaking, I'd say if it's in the tmp folder, I'd guess it'd be safe to delete. If a tmp file was currently in use, you'd get an error message saying so.
    – Brad Bell ♦
    Commented Feb 15, 2020 at 0:48

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