Logs for Mongo DB are located on your Mongo servers in /var/log/mongodb. The specific log name is mongod.log
Sometimes the logs will be full.
You can determine this by typing from the bash $ prompt: df -h
If you see a full folder, you can empty it. Below we use the example that the /var folder is 100% full
You can empty this by using the following command (NOTE: Make sure the "*" is at the end, as to not delete the directory):
$ sudo rm -f /var/log/mongodb/*
Followed by restarting the mongo service using the below command:
$ sudo service mongod restart {note, "mongod" not "mongodb" }
If it throws an error on the attempted restart, wait several seconds and try once more.
