When you have mongo db installed, this is the quick way/ cheat sheet to get it up and running

Mongodb up and running

// Run these commands in Terminall

Stop mongodb service

sudo service mongodb stop
//Remove mongodb lock file

sudo rm /var/lib/mongodb/mongod.lock
//Change ownership from root to mongodb path

sudo chown -R mongodb:mongodb /var/lib/mongodb/
Start mongodb service

sudo service mongodb start
Test mongo app