Stop: Unknown instance mongodb (Ubuntu)

Question

I am new to Mongodb. When I run the following command:

sudo service mongodb start

It shows me \"mongodb start/running, process 3566

Answer 1

The reason you get the Unknown instance error is because upstart is tracking the wrong PID for the instance of forked mongod process. But the proper solution to this is not running the process in foreground by removing fork=true line from the config like @GoingTharn suggesting, but rather helping upstart to capture the right PID of the forked process by adding

expect daemon

to the /etc/init/mongodb.conf