step 8: install mongodb
first create a repository file for the 10gen repo:
# vi /etc/yum.repos.d/10gen.repo
press the "i" key to go into edit mode
paste the following content into the editor
[10gen]
name=10gen Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64
gpgcheck=0