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    Can't create tempfile inside docker

    kjdelys kjdelys posted on 2024-07-23 22:14:10 UTC

    Hello guys,
    i'm having an issue with my rails app deployed with docker. Every time app goes through a code using tempfile i
    t raises an error .

    system temporary path is not writable: /tmp
    11:00:30 web.1    | /tmp is not writable: /tmp
    11:00:30 web.1    | . is not writable: /rails
    11:00:30 web.1    | 2024-07-22 11:00:30 +0000 Rack app ("POST /folders/dropzone_import" - (82.64.63.1)): #<ArgumentError: could not find a temporary directory>

    ruby "3.0.2"
    gem "rails", "~> 7.1.3.1"
    on ubuntun 22.04


    David Kimura PRO said 3 months ago :
    You could try to create a .keep file in the tmp folder. Make sure your .dockerignore isn't excluding the tmp folder.

    Something like this is in the Rails main's .dockerignore.

    # Ignore all logfiles and tempfiles.
/log/*
/tmp/*
!/log/.keep
!/tmp/.keep
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    kjdelys PRO said 3 months ago :
    Hey Thanks   David Kimura  
    i have that. still not working. it keeps raising the same error with 
    Tempfile.new
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    David Kimura PRO said 3 months ago :
    Ah, the /tmp it is referring to may be the system tmp folder. You may want to see if you can create the tempfile within your Rails folder's tmp. My thought is that the dockerfile is changing the user and this user doesn't have access to write there.
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    kjdelys PRO said 3 months ago :
    yeah.


    require 'fileutils'

unless Rails.env.development?
  # force the whole app to use its own tmpdir
  FileUtils.mkdir_p(Rails.root.join('tmp'))
  ENV['TMPDIR'] = Rails.root.join('tmp').to_s
end

    in initializer fix everything
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