forum/docs/existing-project.md

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# Installing on an Existing Project
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It's also possible to use Symfony Docker with existing projects!
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First, [download this skeleton](https://github.com/dunglas/symfony-docker). If you clone the Git repository, be sure to remove the `.git` directory to prevent conflicts with the `.git` directory already in your existing project.
Then, copy the Docker-related files from the skeleton to your existing project:
cp -Rp symfony-docker/. my-existing-project/
Enable the Docker support of Symfony Flex:
composer config --json extra.symfony.docker 'true'
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Re-execute the recipes to update the Docker-related files according to the packages you use
rm symfony.lock
composer symfony:sync-recipes --force --verbose
Double-check the changes, revert the changes that you don't want to keep:
git diff
...
Build the Docker images:
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docker compose build --no-cache --pull
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Start the project!
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docker compose up -d
Browse `https://localhost`, your Docker configuration is ready!