Why do I have to activate the PHP functions: "proc_open" and "proc_close" to backup the database?

I got the error logs:

[error][yii\base\Exception] yii\base\Exception: Could not create backup: proc_open() has been disabled for security reasons in /home/velolade/craft3veloladen_daten/vendor/craftcms/cms/src/controllers/UtilitiesController.php:383

[error][yii\base\Exception] yii\base\Exception: Could not create backup: proc_close() has been disabled for security reasons in /home/velolade/craft3veloladen_daten/vendor/craftcms/cms/src/controllers/UtilitiesController.php:383

After activating these functions in my hoster's PHP settings, it worked. Is this a security problem for my website?

Thank you very much!

1 Answer 1


Craft uses MySQL's native mysqldump and PostgreSQL's pg_dump binaries to create database backups.

In order for PHP to be able to execute those binaries, it needs to be able to run the proc_open and proc_close PHP commands.

I would not consider it a security issue, but if you were really concerned about it, you can prevent Craft from making backups on update and/or specify your own backup logic bypassing Craft's default implementation.

  • How did Craft 2 do it? Craft 2 worked flawlessly with openbasedir, Craft 3 does not.
    – Anders
    Commented Sep 26, 2018 at 20:10
  • Not sure what this post has to do with openbasedir?
    – Brad Bell
    Commented Oct 5, 2018 at 22:04
  • openbasedir disables proc_open(), no? That seems to be how shared hosting typically works in any case.
    – Anders
    Commented Oct 6, 2018 at 1:46
  • Ahh, a host that might use openbase_dir, might also happen to disable some proc_ methods, but they are technically unrelated.
    – Brad Bell
    Commented Oct 6, 2018 at 8:29

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