Make your bundle an application

1.0.33 2019-05-11 15:12 UTC


Welcome to OneBundleApp, a small project to allow your bundle to be an app without any configuration.


  • This project is perfect for your api-exposing bundles. For example, you have a php library proposing an API with a ser of services, and you have a Symfony bundle just built to expose these routes to a Symfony project. In fact, your goal is just create an small API with these routes, right?
  • Until now, a new Symfony application was needed to make this happen, but the question is... why? You have a bundle with some dependencies (defined in your composer.json file and in your bundle), and you only want to expose routes and commands. Why a new app?
  • This project allow to create a new app without having an app, just with your bundle
  • Follow this small guide and publish your bundle in an isolated way.
  • No symfony-standard nor symfony-demo installation. Required.

The question

Symfony environment is changing so much, and with it, the last movements are telling us, the community, that the Bundle idea, the concept, is losing its leadership. Symfony became what it is because of the components and the Bundles, and both elements should be treated the way they deserve.

In this case, we will give some love the the bundles. To your bundle. But first of all, let's talk about what is a bundle. Please, take in account that our conversation should always be "What a bundle is", and never "What a bundle is meant to be". The second is something important at the beginning of any project. The second is important in every real project. Let's talk about what bundles are and their behaviour in the ecosystem.

A Bundle is a layer. A layer that let us propose some classes to a Symfony project and giving these classes an specific purpose. The framework will, then, create these tools to make this business logic accessible from the console and the HTTP channel via the Request/Response pattern.

Good. But we will stay thinking about bundles, and we will not go away from this point.

A bundle is meant to be a package. A plugin. A bundle is meant to be an isolated package. But, and knowing the real ecosystem we have in front of us, is it really this isolated element it was meant to be?

Not. At all.

The package Symfony Bundle Dependencies was created some time ago in order to cover these dependency needs. A bundle, as a PHP package should define the dependencies in an existence way (composer) and in an executable way (Bundle). So the first step was covered by adding this simple layer to your bundles. Each bundle will return an array of Bundle instances or namespaces to define ... To be instanced, I need these other bundles to be instanced first.

Remember the change from Symfony 2.0 and 2.1? Do you remember the old .deps file? Well. This is exactly the same. Exactly the same!

After this movement, your kernel should only have these bundles you specifically want to instantiate. If your bundle then needs other bundles, required by composer previously, then these bundles will be instantiated properly by the library.

Ok. First layer solved.

Continuing talking about what a Bundle is... should a bundle itself be enough to be operative? A bundle contains enough information to make itself runnable without any other layers... so should be a bundle information something http-ready and console-ready?

The answer

Well, the answer is yes.

If my bundle has self-defined commands, self-defined controllers (PHP end-points and a routing.yml file), then nothing else is needed to make it accessible from both point of entry.

The second question is then a natural one. Should all bundles be useful in an isolated way? Not at all. Tels list some examples.

  • Yes - My bundle exposes a simple API, requiring the PHP library that connects to database.
  • Yes - My bundle is a basic console interface to manage queues. No http access but some console items
  • Yes - My bundle is a simple static website
  • Yes - My bundle is part of a project and should be treatable as a simple project as well.
  • No - My bundle is part of an application and is coupled to it
  • No - My bundle is a set of services for other bundles or for a final application
  • No - I have some bundles I want to use, and creating a new Symfony app is too much for me. I don't have enough time and I'm lazy.
  • No - I don't care about what you're talking about

If your case is not recommended, please keep using the Symfony application. Otherwise, if you have a Bundle that should be playable without extra things... You're lucky then. Let's see how to do it.

Playing with it

Let's divide the game in three steps.

The installation. We need to require the library that will transform your bundle into an application. That simple.

To do that, open your composer.json file and merge these lines with your current composer definition.

"require": {
    "one-bundle-app/one-bundle-app": "dev-master"
"scripts": {
    "post-install-cmd": [
    "post-update-cmd": [

By using installEnvironment static method you will install all the environment. You can install parts of this environment

"scripts": {
    "post-install-cmd": [
    // ...
  • installConsole - this will install a console endpoint in bin/console with right usage permissions.
  • installReactServer - this will install a react server in bin/server with right usage permissions.
  • installWebServer - this will install both prod and dev web endpoints inside web folder.

In that case, you will download the package one-bundle-app/one-bundle-app and, after installing or updating, some files will be copied in order to become an application following the Symfony app style.

Then make a composer update.

Then we have the configuration. We need to tell the bundle we want to use for the application and some extra configurations, if we need them. The basic, the app.yml file. Super simple an fast.

# app.yml

bundles: MyBundle\MyBundle
        some: blabla
    - '@MyBundle/Resources/config/routing.yml'

You can specify an extra configuration per each environment, by appending it in the file.

# app_dev.yml

    - MyBundle\MyBundle
    - Symfony\Bundle\WebServerBundle\WebServerBundle
        some: anotherblabla

Some advices here.

  • The app.yml should only have one bundle. Add other bundles in dev environment like the WebServerBundle. All other bundles should be added as dependencies of the bundle. Otherwise, if your case requires more than one bundle, then you may start thinking about an entire application.
  • These files should be small and only contain configuration elements. Each bundle should load their own dependency injection elements.
  • Same for routes. Each bundle should define their own routes, so use the routes part just to load specific bundle routing.yml file.

After the composer update, the system will create these elements in your bundle root.

  • a /var folder, where to add cache, sessions, logs...
  • a /web folder, with two files. The HTTP entry points app.php and the app_dev.php files. Both files are just soft links.
  • a /bin folder, with one file. The console entry point console. This file is just a soft link as well, and has the right permissions to be executable.

That should be enough. Then your bundle should be accessible both from console and the HTTP layer. Use an Apache or an Nginx, or even the command bin/console server:run without any extra configuration.

Using the ReactPHP Server

By using the ReactPHP Server, you'll be able to provide a nice endpoint by using a persistent Symfony kernel, always hosted in memory, and with all needed services already built.

Make sure you have configured the project to have a server installed

"scripts": {
    "post-install-cmd": [

After that, you'll be able to initialize the server by just doing

  • The first mandatory parameter tells the host and endpoint you want to keep listening. means localhost, but accessible from everywhere.
  • By default, the server is initialized with environment prod. You can change this behavior by using flags
bin/server --dev
  • By default, the server is initialized with debug = false. You can change this behavior by using flags
bin/server --debug
  • In development mode, you may like to work in development environment with debug. Then you can mix both flags :)
bin/server --dev --debug

Using the PPM Server

You can use as well the PPM server if you need to have a little bit more workers availability (for example if you have some long-term processes mixed with short-term processes).

You can check PHP PM Project documentation of how to start the server. This repository has specific bridge and adapter classes to work properly and only with this integration.

vendor/bin/ppm start --host= --port=8888 \
    --workers=3 \
    --bootstrap=OneBundleApp\\PPM\\Adapter \
    --bridge=OneBundleApp\\PPM\\Bridge \
    --app-env=prod \
    --debug=0 --logging=0