MongoDB is a free and open-source cross-platform document-oriented database program. Classified as a NoSQL database program, MongoDB uses JSON-like documents with schemas.
1. Add the MongoDB Repository and insert in file.
# sudo vi /etc/yum.repos.d/mongodb-org.repo
[mongodb-org-3.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc
2. Update repolist
# yum repolist
3. Installing MongoDB
# sudo yum install mongodb-org
4. start the MongoDB service
# systemctl start mongod