1. Add the MongoDB yum repository.

# vim /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

2. Install?MongoDB

# yum install -y mongodb-org

3. Start MongoDB.

# service mongod start

Starting mongod: [ OK ]

4. Verify that MongoDB started successfully.

# cat /var/log/mongodb/mongod.log | grep"waiting for connections on port"

2015-09-23T16:39:35.455+0300[initandlisten] waitingforconnections on port 27017

5. Configure the database to start automatically when OS starts.

$ sudo chkconfig mongo on

6. Configure iptables

# /sbin/iptables -I INPUT -p tcp --dport 27017 -j ACCEPT

# service iptables save

# service iptables restart