[warn] module wsgi_module is already loaded, skipping

When you did the following for Graphite,

sudo cp /opt/graphite/examples/example-graphite-vhost.conf /etc/httpd/conf.d/graphite.conf

you will get the following warning:

httpd ()  : [Fri Jul 03 19:16:29 2015] [warn] module wsgi_module is already loaded, skipping

You should comment out the original WSGI configuration as follows:

sudo vi /etc/httpd/conf.d/wsgi.conf

#LoadModule wsgi_module modules/mod_wsgi.so

Reference:
http://stackoverflow.com/questions/12120057/module-wsgi-module-is-already-loaded-skipping