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Symfony 5: The Fast Track is the best book to learn modern Symfony development, from zero to production. +300 pages showcasing Symfony with Docker, APIs, queues & async tasks, Webpack, SPAs, etc.

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How to log Messages to different Files

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How to log Messages to different Files

New in version 2.1: The ability to specify channels for a specific handler was added to the MonologBundle for Symfony 2.1.

The Symfony Standard Edition contains a bunch of channels for logging: doctrine, event, security and request. Each channel corresponds to a logger service (monolog.logger.XXX) in the container and is injected to the concerned service. The purpose of channels is to be able to organize different types of log messages.

By default, Symfony2 logs every messages into a single file (regardless of the channel).

Switching a Channel to a different Handler

Now, suppose you want to log the doctrine channel to a different file.

To do so, just create a new handler and configure it like this:

  • YAML
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    # app/config/config.yml
    monolog:
        handlers:
            main:
                type:     stream
                path:     /var/log/symfony.log
                channels: [!doctrine]
            doctrine:
                type:     stream
                path:     /var/log/doctrine.log
                channels: [doctrine]
    
  • XML
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    <!-- app/config/config.xml -->
    <container xmlns="http://symfony.com/schema/dic/services"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:monolog="http://symfony.com/schema/dic/monolog"
        xsi:schemaLocation="http://symfony.com/schema/dic/services
            http://symfony.com/schema/dic/services/services-1.0.xsd
            http://symfony.com/schema/dic/monolog
            http://symfony.com/schema/dic/monolog/monolog-1.0.xsd"
    >
        <monolog:config>
            <monolog:handler name="main" type="stream" path="/var/log/symfony.log">
                <monolog:channels>
                    <monolog:channel>!doctrine</monolog:channel>
                </monolog:channels>
            </monolog:handler>
    
            <monolog:handler name="doctrine" type="stream" path="/var/log/doctrine.log">
                <monolog:channels>
                    <monolog:channel>doctrine</monolog:channel>
                </monolog:channels>
            </monolog:handler>
        </monolog:config>
    </container>
    
  • PHP
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    // app/config/config.php
    $container->loadFromExtension('monolog', array(
        'handlers' => array(
            'main'     => array(
                'type'     => 'stream',
                'path'     => '/var/log/symfony.log',
                'channels' => array(
                    '!doctrine',
                ),
            ),
            'doctrine' => array(
                'type'     => 'stream',
                'path'     => '/var/log/doctrine.log',
                'channels' => array(
                    'doctrine',
                ),
            ),
        ),
    ));
    

YAML specification

You can specify the configuration by many forms:

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channels: ~    # Include all the channels

channels: foo  # Include only channel "foo"
channels: !foo # Include all channels, except "foo"

channels: [foo, bar]   # Include only channels "foo" and "bar"
channels: [!foo, !bar] # Include all channels, except "foo" and "bar"

Creating your own Channel

You can change the channel monolog logs to one service at a time. This is done by tagging your service with monolog.logger and specifying which channel the service should log to. By doing this, the logger that is injected into that service is preconfigured to use the channel you’ve specified.

For more information - including a full example - read “monolog.logger” in the Dependency Injection Tags reference section.

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This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.