Overview:

• install
• make service star on startup: sudo systemctl enable mongod
• start: sudo service mongod start , on default port 27017
• status: sudo service mongod status
• connect: mongo
• enable monitoring: db.enableFreeMonitoring()
• stop: sudo service mongod stop

Directories:

• conf: /etc/mongod.conf, options here
• data: /var/lib/mongodb
• logs: /var/log/mongodb