Sorry I was AWOL yesterday. I was in that Canton, TX tornado! Okay, not "in" it, but was in Canton when it happened.
Typo in MongoDB installation
" nano /etc/mongodb.conf " should be "nano /etc/mongod.conf"
"service mongodb restart" should be "service mongod restart"
I think it might be an OS thing: http://stackoverflow.com/questions/11600006/how-to-create-a-configuration-file-for-mongodb