Symfony Multiple Kernels

Repository presents Symfony project with multiple kernel approach.

Multiple Kernels

Symfony Multiple Kernels allows you create many independent Kernels. Thanks to that you can: manage the bundles you use and separate configuration for every kernel.

Introduction

Let's assume your project has two parts:

• api
• admin

And just only for admin version you need to use Twig which is useless for api part. To achieve this you have to create two instances of AppKernel:

• ApiKernel
• AdminKernel

Those two classes extend from AppKernel. This way you can get separate bundle list for each kernel.

Configs, Sessions, Caches & Logs

To separate configuration, sessions, caches and logs you need overwrite AppKernel.php methods;

• getCacheDir
• getLogDir
• getKernelParameters
• registerContainerConfiguration

New directory structure

app

app/
├── .htaccess
├── AdminKernel.php
├── ApiKernel.php
├── AppCache.php
├── AppKernel.php
├── KernelFactory.php
├── Resources
│   └── views
├── autoload.php
└── config
    ├── admin
    └── api

cache

var/cache/
├── .gitkeep
├── admin
│   └── dev
└── api
    └── dev

sessions

var/sessions/
├── .gitkeep
├── admin
│   └── dev
└── api
    └── dev

logs

var/logs
├── .gitkeep
├── admin
│   ├── dev.log
│   └── prod.log
└── api
    ├── dev.log
    └── prod.log

Multiple parameters.yml

Separate parameters require custom parameters builder, and replacement in composer.json.

Switch between Multiple App Kernels

This action can be handle by exporting APP_NAME env like SYMFONY_ENV or by adding -a admin or --app-name=admin command's options. e.g. bin/console --app-name=admin