http://www.rubyenterpriseedition.com/download.html
/opt/ree/bin/gem update –system 1.5.2
delete all gems in ree:
/opt/ree/bin/gem list --no-version | xargs /opt/ree/bin/gem uninstall -aIx
/etc/environment: PATH=”/opt/ree/bin ….”
sudo passenger-memory-stats
sudo passenger-status
http://www.linuxask.com/questions/how-to-tell-if-apache-2-is-using-prefork-or-worker-mpm
apache2 -V (verifica prefork sau itk)
apache2ctl -M (verifica modulele)