[Deployment] Update deployment docs with new .env files logic #13084
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The changes from last year regarding how the
.env
files are loaded can affect production deployments. Vendors like Heroku give recommendations based on documentation that no longer applies: "It is recommended that you do not use the symfony/dotenv package in production".The
symfony/dotenv
has been moved fromrequire-dev
torequire
, so the note I removed in this PR no longer applies: symfony/skeleton#122 , symfony/website-skeleton#132 and symfony/demo@7ead1e4 . Loading.env
files in production will work without any changes in composer.json.Putting
symfony/dotenv
inrequire-dev
(or not moving it torequire
during an upgrade from older versions of Symfony & recipes) can potentially break your app: if the DotEnv class is missing, theconfig/bootstrap.php
file inside the FrameworkBundle's recipe will throw a RuntimeException . Also see symfony/recipes#501The note now contains the right way to handle these files in production, by using
$ composer dump-env prod
in case you do not want the.env
files to be processed on every request, also suggesting the--empty
flag if you want to rely exclusively on "real" environment variables .