There is hardly anything to this, because MRTG comes with a script to create its own root web directory. So, all you need to do is configure the Lighttpd startup files. The Debian installer creates startup files, and starts up the HTTP daemon for you. On Fedora, you need to do this yourself:
# /etc/init.d/lighttpd start
To have it start automatically at boot, use chkconfig, and confirm that it worked:
# chkconfig lighttpd on
# chkconfig --list lighttpd
lighttpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
Then, check by opening a web browser to http://localhost/. This should display the default HTTP server page, like Figure 14-1 shows.
lighttpd is controlled on Fedora via the usual startup script commands:
# /etc/init.d/lighttpd {start|stop|status|restart|condrestart|reload}
Debian's are little bit different:
# /etc/init.d/lighttpd {start|stop|restart|reload|force-reload}
Lighttpd: http://www.lighttpd.net/