$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
$ echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list
$ sudo apt-get update
$ sudo apt-get install mongodb-org

Si en /etc/apt/sources.list.d aparece el fichero mongod sin extensión, entonces tendrás que renombrarlo a mongod.list.
Probablemente tengas que lanzar sudo apt-get install mongodb-server

$ sudo start mongod

… or…

$ sudo service mongod start

$ sudo stop mongod

$ mongo

A Mongo server contain multiple data bases. Data bases are collection containers and a collection is a documents container. Documents are equivalents to records.
Documents inside a collection can have different fields, they are stored as BSON objects and accessed as JSON objects as well.
A namespace in Mongo is the concatenation of database and collection names. For an example acme.users namespace, acme is the database name and users is the collection name. We could also have a collection called users.history, then the namespace would be acme.users.history.

By default you access to the test database.

• You can list your current database with db command.
• List your databases with show dbs command.
• Create and switch to a new (newdb) data base with use newdb command.
• help to display help.
• show collections lists available collections.

j = { name : "mongo" }
k = { x : 3 }
db.testData.insert( j )
db.testData.insert( k )

db.testData.find()

You should edit /etc/mongodb.conf file and change the bind_ip and port values. These would be the values:

bind_ip = 0.0.0.0
port = 27017

• Logs are found in /var/log/mongodb
• Robomongo is a good ubuntu GUI client for MongoDB.

When the system crashes MongoDB remains locked (error is shown in logs as mongodb exception in initandlisten old lock file). You chan do two things to unlock it:

• If this is a development machine, you can remove the lock file manually. It's in /var/lib/mongodb/mongod.lock or it could be named mongo.lock.
• The safer route is to follow MongoDB's Durability and Repair guide. In summary, for a machine with the above configuration, you should execute the following commands:

$ sudo -u mongodb mongod --repair --dbpath /var/lib/mongodb/
$ sudo service mongodb start