In this post, I am going to use yum to install MongoDB-3.6 from MongoDB’s official repository. First we start with adding a .repo file at location /etc/yum.repos.d/. You can name the file anyway you wish but the extension has to be .repo.
1
vim /etc/yum.repos.d/mongodb.repo
Paste the follow code into the .repo file you created, save and exit. You can change 3.6 to the version you want. For instance, 3.4 or 3.2.
1
2
3
4
5
6
[mongodb-org-3.6]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc
Check if the repository is successfully added.
1
yum repolist
Start installing MongoDB.
1
yum install mongodb-org
The functionality of each installed packages. 
After installation, let’s check the initial status of mongod.
1
systemctl status mongod
For more usage of systemctl, please refer: CentOS7 Systemctl Cheat Sheet
Mongod is enabled initially. If the service is not enabled, use command below to enable and start the service.
1
2
systemctl enable mongod
systemctl start mongod
Check the version of mongod.
1
mongo -version
Locations related to Mongodb.
/etc/mongod.conf; config file of mongod./var/log/mongodb/; log file of mongod./var/lib/mongo/; db path of mongod, all data files are store here.
Connect to mongod.
1
mongo
REPLATED POSTS:
MongoDB Enable User Login Authentication
Setup MongoDB Replication With Arbiter Environment
REFERENCES:
Install MongoDB Community Edition on Red Hat Enterprise or CentOS Linux