Very simple procedure:

• service ndo2db stop
  service centstorage stop
  service centcore stop
• ./install.sh -u /etc/centreon
• service centstorage start
  service centcore start
  service ndo2db start

Restarting the daemons is needed to make sure the new software is loaded into memory. I.e.: not restarting the service centstorage will result in graphs not being updated anymore.

Troubleshooting Centreon Graphs

Check if service-perfdata is growing. If so then the file is not being emptied by NDO2DB:
# tail -f /usr/local/nagios/var/service-perfdata

Check if Centstorage proces is running:
# ps -ef |grep centstor

Check the centstorage log or errors:
# tail -f /usr/local/centreon/log/centstorage.log
Restart centstorage if you find errors.