To upgrade Cacti under UNIX style operating systems, you should use the following instructions. To upgrade Cacti on Windows, you should use the instructions in the Link below:
Backup the old Cacti database.
Note: You will probably have to specify the -u and -p flags for the MySQL username and password. This user must have permission to read from Cacti's database or you will end up with an empty backup.
Backup the old Cacti directory with the exception of the RRD files which should not need backup.
Extract the distribution tarball.
Copy the distribution tarball over the existing installation.
Set the appropriate permissions on Cacti's directories for graph/log generation. You should execute these commands from inside Cacti's directory to change the permissions.
(Enter a valid username for cactiuser, this user will also be used in the next step for data gathering.)
If you are using the optional feature Performance -> Image Caching, also recreate the folder and correct the permissions.
Point your web browser to:
http://your-server/cacti/
Follow the on-screen instructions so your database can be updated to the new version.
Note that starting with Cacti 1.0, all Data Collectors will upgrade themselves automatically within two polling cycles. If for some reason they do not, upgrade them one at a time.
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