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Revision as of 21:01, 28 April 2013 by Speed (talk | contribs) (MongoDB won't more to start: Make this actually understandable)
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MongoDB (from humongous) is an open source document-oriented database system developed and supported by 10gen. It is part of the NoSQL family of database systems. Instead of storing data in tables as is done in a "classical" relational database, MongoDB stores structured data as JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster.

Installing MongoDB

Install mongodb

# pacman -S mongodb

Start MongoDB

# systemctl start mongodb

(Optional) Add MongoDB to the list of daemons that start on system startup

# systemctl enable mongodb

Access the database shell

To access the Database shell you have type in your terminal

# mongo


MongoDB won't start

Check if the lock file exists

# ls  -lisa /var/lib/mongodb

If it does, stop the mongodb service, and delete the file. Then start the service again.

# rm /var/lib/mongodb/mongod.lock

If it still won't start, run a repair on the database, specifying the dbpath (/var/lib/mongodb/ is the default --dbpath in Arch Linux)

# mongod --dbpath /var/lib/mongodb/ --repair

After running the repair as root, the files got chowned to root, whilst Arch Linux runs it under a different user. You then need to chown back the files. Further reference

# cd /var/log/mongod
# sudo chown -R mongodb:mongodb .
# cd /var/lib/mongodb
# sudo chown -R mongodb:mongodb .