I am going to install mongodb on Amazon ec2 ubuntu 12.0.4 linux server and change the default location of the mongodb. I searched the internet and saw a lot of article that tell the user to use. For example this article, page 7.
sudo chown mongod:mongod /your_data_storage_folder
to get permission to your new mongodb location.
I just wonder, there is know mongodb user and mongodb group how could I do that?!! most of the article wrote that and it couldnt work!! Is there any way to do that?! tips?!