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

I faced exactly the same problem and did the followings:

• Removed the file mongod.lock (in my case this file was located at /var/lib/mongodb/)
• Used the following command from my mongo client

mongo --repair

And that fixed the issue. It may be noted that I had a system crash prior to this problem appeared. Therefore, what I believe, the problem was caused due to the unclean shutdown of the server demon.

If you are unsure of the reason, you may wish to have a look at the log file (in my case I found it under /var/log/mongodb/). That might give you some useful hints.

Thanks.