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When you develop a Symfony project, a significant amount of work takes place locally rather than on an active Upsun Cloud environment. You want to ensure that the process of local development is as close as possible to a deployed environment. You can achieve this through various approaches. For example, you can use Symfony Server with tethered data. To do so, when testing changes locally, you can connect your locally running Symfony Server to service containers on an active Upsun Cloud environment. This methodology has several advantages:
  • It avoids installing anything on your local machine except PHP.
  • It ensures that you are using the same versions of all services on your local machine and in production.

Warning

Never use this method on the main environment as changes made on your local machine will impact production data.

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Before you begin

You need:
  • A local copy of the repository for a project running on Upsun Cloud. You can clone an integrated source repository and set the remote branch. To do so, run symfony cloud:project:set-remote PROJECT_ID.
  • The Symfony CLI

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1. Start your Symfony Server

To start your Symfony Server locally and display your Symfony app, run the following command:
This starts the Symfony Server and opens the app in your local browser.

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2. Create the tethered connection

  1. Create a new environment from production:
  2. Open an SSH tunnel to the new environment’s services:
    This command returns the addresses for SSH tunnels to all of your services:
  3. To expose Upsun Cloud services to your Symfony app, run the following command:
    This automatically configures your local Symfony app to use all your remote Upsun Cloud services (remote database, remote Redis component, etc.). To check that you’re now using remote data and components from Upsun Cloud, reload your local app within your browser.
  4. When you’ve finished your work, close the tunnels to your services by running the following command:
Last modified on October 23, 2026