I've noticed that Craft 3 log files in storage/logs e.g. web-404s.log and web.log don't seem to have a max size or rotate like with Craft 2.

The web-404s.log file is nearly 10 megs for 1 site now.

Should the log files continually grow like this or is there just an issue with my setup?

Are there config settings to set the max log file size or disable certain logging that I'm missing?


1 Answer 1


Craft goes with Yii 2's defaults in the FileTarget class, which is 10MB for a log file before rotating. https://www.yiiframework.com/doc/api/2.0/yii-log-filetarget#$maxFileSize-detail

You can overwrite that behavior from your config/app.php file by using something like:

'components' => [
        'log' => function() {
            $log = Craft::createObject([
                'class' => yii\log\Dispatcher::class,
                'targets' => [
                        'class' => craft\log\FileTarget::class,
                        'levels' => !YII_DEBUG ? yii\log\Logger::LEVEL_ERROR | yii\log\Logger::LEVEL_WARNING : yii\log\Logger::LEVEL_ERROR | yii\log\Logger::LEVEL_WARNING | yii\log\Logger::LEVEL_INFO | yii\log\Logger::LEVEL_TRACE | yii\log\Logger::LEVEL_PROFILE,
                        'maxFileSize' => 5120, // 5MB

            return $log;
  • Great - many thanks for this info. Is it possible to disable the 404 logging altogether?
    – Janine
    Oct 22, 2018 at 8:55
  • A plugin/module that used it's own ErrorHandler or FileTarget class could get away with it.
    – Brad Bell
    Oct 22, 2018 at 17:16

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