Log rotating with Monolog in Symfony2
On linux, you can use logrotate (I don't know if exists other solutions on windows or macos)
In /etc/logrotate.d/ create a file (eg. sf2_myapp) and add this content :
/path/to/your/symfony_app/app/logs/prod.log { daily missingok rotate 14 compress}
You should look for logrotate on Google for more infos