MongoDB is the only database that harnesses the innovations of NoSQL (flexibility, scalability, performance) and builds on the foundation of relational databases (expressive query language, secondary indexes, strong consistency). In this documentation, I will show how to install MongoDB on CentOS 6.

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Add MongoDB repository to yum

sudo vi /etc/yum.repos.d/mongodb.repo

[mongodb]
name=MongoDB Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/
gpgcheck=0
enabled=1

Install MongoDB

sudo yum install mongo-10gen mongo-10gen-server --exclude mongodb-org,mongodb-org-server

Add this to /etc/yum.conf to prevent MongoDB from being upgraded

sudo vi /etc/yum.conf

...
exclude=mongo-10gen,mongo-10gen-server

Start MongoDB service and configure it to start at boot

sudo service mongod start
sudo chkconfig mongod on

Reference: https://docs.mongodb.org/v2.4/tutorial/install-mongodb-on-red-hat-centos-or-fedora-linux/