Note: MongoDBs data files are usually located at /data/db but in my Ubuntu installation they where in /var/lib/mongodb.
Repair preserving data:
sudo mkdir /var/lib/mongodb0 sudo mongod --dbpath /var/lib/mongodb --repair --repairpath /var/lib/mongodb0 sudo mongod --dbpath /var/lib/mongodb0
Now that the server is up with a repaired version (/var/lib/mongodb0) of your original data (from /var/lib/mongodb) use mongo client to verify that everything is OK. In that case replace /var/lib/mongodb with /var/lib/mongodb0.
sudo rm -rf /var/lib/mongodb sudo mv /var/lib/mongodb0 /var/lib/mongodb sudo chown -R mongodb:mongodb /var/lib/mongodb
Repair without preserving data:
sudo rm /var/lib/mongodb/mongod.lock sudo mongod --dbpath /var/lib/mongodb --repair
When this completes, the repaired data files will replace the original data files in the /var/lib/mongodb directory.
Ref: http://docs.mongodb.org/manual/tutorial/recover-data-following-unexpected-shutdown/
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