Mongodb not working on Ubuntu 16.04

Question

I installed mongodb following this tutorial here, no errors during the installation but when I try to start the mongod server using this command sudo systemctl start m

Answer 1

because the permission setting

chown -R mongodb:mongodb /var/lib/mongodb
chown mongodb:mongodb /tmp/mongodb-27017.sock

if this worked for me after reinstalling mongodb. I have created manually

sudo mkdir /var/lib/mongodb
sudo mkdir /var/log/mongodb

and changed owner for both

sudo chown -R mongodb:mongodb /var/lib/mongodb
chown -R mongodb:mongodb /var/log/mongodb