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.
# pacman -S 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
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 .