Failed to start mongod.service: Unit mongod.service not found

Question

I follow all the steps mention in MongoDB installation documents for Ubuntu 16.04.

Steps 1:

sudo apt-key adv --keyserv         


        

Answer 1

This happened to me while adding users in admin db.

sudo systemctl daemon-reload 

is recommended from the official mongo website, but did not help.

If you get

Job for mongod.service failed because the control process exited with error code. See "systemctl status mongod.service" and "journalctl -xe" for details.

While executing

sudo systemctl start mongod

run journalctl -xe and if the issue is

Failed to start MongoDB Database Server.
-- Subject: Unit mongod.service has failed

Then run sudo mongod --> mongo This will fix the issue and if you want to run with systemctl, then terminate the windows for mongod and mongo and run

sudo systemctl start mongod 

and then mongo