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To activate pcntl in PHP when utilizing a framework such as Symfony 2, you should follow these steps:

1. Check if pcntl extension is installed by running php -m | grep pcntl on the command line. If the extension is not installed, you can install it using the following command for Ubuntu/Debian: sudo apt-get install php-pcntl or for CentOS/Fedora: sudo yum install php-pcntl.

2. Add the following line to your PHP code to enable the extension: pcntl_signal(SIGTERM, function () { exit(); });

3. If using Symfony 2, add the following line to your app/autoload.php file: if (!function_exists('pcntl_signal')) { throw new \RuntimeException('PCNTL extension is not installed'); }

4. If you are using a third-party bundle or library that requires pcntl, check the documentation for any additional configuration needed.

5. Restart your web server to apply the changes.