Welcome to the MongoDB Manual! MongoDB is an open-source, document-oriented database designed for ease of development and scaling.
The Manual introduces MongoDB and continues to describe the query language, operational considerations and procedures, administration, and application development patterns, and other aspects of MongoDB use and administration. See the Introduction to MongoDB for an overview of MongoDB’s key features. The Manual also has a thorough reference section of the MongoDB interface and tools.
This manual is under constant development. See the About MongoDB Documentation for more information on the MongoDB Documentation project.
Install mongoDB for centOS follow here : http://docs.mongodb.org/manual/tutorial/install-mongodb-on-red-hat-centos-or-fedora-linux/