I'm running an nginx server with php5-fpm and was always getting mail in /var/mail/root telling me that the cronjob running usr/lib/php5/maxlifetime was throwing warnings. The warnings were that: PHP Warning: Module 'mcrypt' already loaded in Unknown on line 0 To fix this I had a look at the file and noticed that it was looping through the various sapi methods and running a command. The line in the shell script looks like this: for sapi in apache2 apache2filter cgi fpm; do if [ -e /etc/php5/${sapi}/php.ini ]; then So I removed the mcrypt extension from my apache2 php.ini (/etc/php5/apache2/php.ini) and now the maxlifetime shell script runs without throwing warnings.