The /tmp directory grows very large and contains many “magick-xxxxx” files in its subdirectories

Symptoms

• Plesk Obsidian running on a Linux-based operating system
• The /tmp directory grows very large and contains a lot of files named magick-xxxxxx files in its PHP-related subdirectories:

  # root@server:~# find /tmp -mtime 0 -type f -size +20M -exec du -h {} + 2>/dev/null | sort -r -h
  287M /tmp/systemd-private-dad58d2003dc46f7be3e15a7d0b108c2-plesk-php80-fpm.service-hRFoZf/tmp/magick-ZzObCMs_8oJXUyrrwzU0J5dysuKlf53e
  287M /tmp/systemd-private-dad58d2003dc46f7be3e15a7d0b108c2-plesk-php80-fpm.service-hRFoZf/tmp/magick-zXuukgf5zr0OHKr5zb2fxbbRmURwZvAr
  287M /tmp/systemd-private-dad58d2003dc46f7be3e15a7d0b108c2-plesk-php80-fpm.service-hRFoZf/tmp/magick-ZnPsDblwmpistIoKyBxDtlaWdeHfRK7S
  287M /tmp/systemd-private-dad58d2003dc46f7be3e15a7d0b108c2-plesk-php80-fpm.service-hRFoZf/tmp/magick-zlpU1JviUboC0MwpfPnJr1pBHK2yAPZD
  287M /tmp/systemd-private-dad58d2003dc46f7be3e15a7d0b108c2-plesk-php80-fpm.service-hRFoZf/tmp/magick-zkgLMhivXjDOpW9DmZk24SJ7MEkRJm19
  ...

• The imagick (ImageMagick) PHP extension is enabled for the PHP versions that contain such files in Tools & Settings > PHP Settings > PHP_Handler_Name
  
  

Cause

The specific website code and its interaction with the PHP extension imagick is generating a great number of files in the mentioned temporary directory.

The issue is not related to Plesk but, is related to ImageMagick itself, which can be confirmed in the following threads:
 
ImageMagick creates huge temporary files · Issue #395 · ImageMagick/ImageMagick · GitHub
carrierwave - imagemagick doesn't delete tmp files - Stack Overflow

Resolution

The recommended initial course of action is to review the website code and the specific portion of it that interacts with ImageMagick and generates these files in order to resolve the issue.

As a workaround, you can set up the automated removal of such temporary files related to ImageMagick by following these steps:

1. 1. Connect to the server via SSH

   2. Open the crontab editor by executing the following command:

      # crontab -e

   3. Add the following line to create a task which removes files like magick-* from the directory /tmp every minute:

      * * * * * find /tmp -maxdepth 1 -type f -name "magick-*" -delete

Additional information

Scheduling Tasks | Plesk Obsidian documentation

How to set up a task to be executed every X minutes on a Plesk server?

How to Create and Manage Cron Jobs on Linux