forum/docs/build.md

Build Options

Selecting a Specific Symfony Version

Use the SYMFONY_VERSION environment variable to select a specific Symfony version.

For instance, use the following command to install Symfony 5.4:

SYMFONY_VERSION=5.4.* docker compose up --build

Installing Development Versions of Symfony

To install a non-stable version of Symfony, use the STABILITY environment variable during the build. The value must be a valid Composer stability option) .

For instance, use the following command to use the development branch of Symfony:

STABILITY=dev docker compose up --build

Customizing the Server Name

Use the SERVER_NAME environment variable to define your custom server name(s).

SERVER_NAME="app.localhost, caddy:80" docker compose up --build

If you use Mercure, keep caddy:80 in the list to allow the PHP container to request the caddy service.

Using custom HTTP ports

Use the environment variables HTTP_PORT, HTTPS_PORT and/or HTTP3_PORT to adjust the ports to your needs, e.g.

HTTP_PORT=8000 HTTPS_PORT=4443 HTTP3_PORT=4443 docker compose up --build

to access your appplication on https://localhost:4443.