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Run Symfony on App Engine flexible environment

Author(s): @bshaffer , Published: 2017-03-15

Brent Shaffer | Developer Programs Engineer | Google

Contributed by Google employees.

You can check out PHP on Google Cloud to get an overview of PHP itself and learn ways to run PHP apps on Google Cloud.

Prerequisites

Create a project in the Cloud Console and make note of your project ID.
Enable billing for your project.
Install the Cloud SDK.

Prepare

Follow the official documentation for installing symfony from symfony.com.

Run

Run the app with the following command:
```
php bin/console server:run
```
Visit http://localhost:8000 to see the Symfony Welcome page.

Deploy

Create an app.yaml file with the following contents depending on the version of Symfony that you are using:

Symfony 2 and 3

runtime: php
env: flex

runtime_config:
  document_root: web
  front_controller_file: app.php

Symfony 4 and above

runtime: php
env: flex

runtime_config:
  document_root: public
  front_controller_file: index.php

env_variables:
    APP_ENV: "prod"

Replace post-install-cmd in composer.json with the following script:
```
"post-install-cmd": [
    "chmod -R ug+w $APP_DIR/var"
],
```
In the context of Symfony's composer.json, it will look like this:
Run the following command to deploy your app:
```
gcloud app deploy
```
Visit http://YOUR_PROJECT_ID.appspot.com to see the Symfony welcome page!

Connect to CloudSQL with Doctrine

Setup

Follow the instructions to set up a Cloud SQL Second Generation instance for MySQL.
Follow the instructions to install the Cloud SQL proxy client on your local machine. The Cloud SQL proxy is used to connect to your Cloud SQL instance when running locally.
Enable the CloudSQL APIs in your project.
Use the Cloud SDK from the command line to run the following command. Copy the connectionName value for the next step. Replace YOUR_INSTANCE_NAME with the name of your instance:
```
gcloud sql instances describe YOUR_INSTANCE_NAME
```
Start the Cloud SQL proxy and replace YOUR_INSTANCE_CONNECTION_NAME with the connection name you retrieved in the previous step:
```
cloud_sql_proxy -instances=YOUR_INSTANCE_CONNECTION_NAME=tcp:3306 &
```
Note: Include the -credential_file option when using the proxy, or authenticate with gcloud, to ensure proper authentication.

Configure

Modify app/config/parameters.yml so the database fields pull from environment variables. We've also added some default values for environment variables which are not needed for all environments. Notice we've added the parameter database_socket, as Cloud SQL uses sockets to connect:

parameters:
    database_host: '%env(DB_HOST)%'
    database_name: '%env(DB_DATABASE)%'
    database_port: '%env(DB_PORT)%'
    database_user: '%env(DB_USERNAME)%'
    database_password: '%env(DB_PASSWORD)%'
    database_socket: '%env(DB_SOCKET)%'

    # Set sane environment variable defaults.
    env(DB_HOST): ""
    env(DB_PORT): 3306
    env(DB_SOCKET): ""

    # Mailer configuration
    # ...

Modify your Doctrine configuration in app/config/config.yml and add a line for unix_socket using the parameter we added:

# Doctrine Configuration
doctrine:
    dbal:
        driver: pdo_mysql
        host: '%database_host%'
        port: '%database_port%'
        dbname: '%database_name%'
        user: '%database_user%'
        password: '%database_password%'
        charset: UTF8
        # add this parameter
        unix_socket: '%database_socket%'

    # ORM configuration
    # ...

Use the symfony CLI to connect to your instance and create a database for the application. Be sure to replace YOUR_DB_PASSWORD below with the root password you configured:

# create the database using doctrine
DB_HOST="127.0.0.1" DB_DATABASE=symfony DB_USERNAME=root DB_PASSWORD=YOUR_DB_PASSWORD \
    php bin/console doctrine:database:create

Modify your app.yaml file with the following contents:

runtime: php
env: flex

runtime_config:
    document_root: web
    front_controller_file: app.php

env_variables:
    ## Set these environment variables according to your CloudSQL configuration.
    DB_DATABASE: symfony
    DB_USERNAME: root
    DB_PASSWORD: YOUR_DB_PASSWORD
    DB_SOCKET: "/cloudsql/YOUR_CLOUDSQL_CONNECTION_NAME"

beta_settings:
    # for Cloud SQL, set this value to the Cloud SQL connection name,
    # e.g. "project:region:cloudsql-instance"
    cloud_sql_instances: "YOUR_CLOUDSQL_CONNECTION_NAME"

Replace each instance of YOUR_DB_PASSWORD and YOUR_CLOUDSQL_CONNECTION_NAME with the values you created for your Cloud SQL instance above.

Run

In order to test that our connection is working, modify the Default Controller in src/AppBundle/Controller/DefaultController.php so that it validates our Doctrine connection:

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class DefaultController extends Controller
{
    /**
        * @Route("/", name="homepage")
        */
    public function indexAction(Request $request)
    {
        $entityManager = $this->get('doctrine.orm.entity_manager');
        if ($entityManager->getConnection()->connect()) {
            echo 'DOCTRINE WORKS';
        }
        // replace this example code with whatever you need
        return $this->render('default/index.html.twig', [
            'base_dir' => realpath($this->getParameter('kernel.project_dir')).DIRECTORY_SEPARATOR,
        ]);
    }
}

Now you can run locally and verify the connection works as expected.

DB_HOST="127.0.0.1" DB_DATABASE=symfony DB_USERNAME=root DB_PASSWORD=YOUR_DB_PASSWORD \
    php bin/console server:run

Reward all your hard work by running the following command and deploying your application to App Engine:
```
gcloud app deploy
```

What's next

Check out the Databases and the Doctrine ORM documentation for Symfony.
View a Symfony Demo Application for App Engine flexible environment.

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