Seems a little dumb, and I’m not sure how other distributions deal with it, but if you install Cacti from RPM on CentOS, and then browse to your /cacti/ directory via HTTP, you’ll find that it dies with a segmentation fault. You know this is you if every other website on your host works, but everytime you go to your /cacti/ URL, your browser reports that the site is totally unavailable (as if apache weren’t even running).
In /var/log/httpd/error.log, you’ll see the following:
[Thu Mar 29 00:14:32 2012] [notice] child pid 2690 exit signal Segmentation fault (11)
[Thu Mar 29 00:14:36 2012] [notice] child pid 2683 exit signal Segmentation fault (11)
The workaround for this is to import cacti.sql into your (pre-created) database, by running:
mysql cacti -u cacti -p < /var/www/cacti/cacti.sql
(The above is assuming your database and user are both called “cacti”)
Once you’ve imported the schema, and you go to the /cacti/ URL, you’ll be presented with the Cacti setup screen, and all will be well