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

$ mongo --version
MongoDB shell version: 2.6.6
$ mongo
> db.test.save( { test: 100 } )
> db.test.find()
{ "_id" : ObjectId("549253f4d91767276c02fc14"), "test" : 100 }

Sources: /usr/bin/
Logs: /var/log/mongodb/mongod.log
Data: /var/lib/mongodb/
Default ip: 127.0.0.1
Default port MongoDB is listening: 27017

$ sudo service mongod start
$ sudo service mongod stop
$ sudo service mongod restart

echo "no" > answers.txt
sudo pecl install mongo < answers.txt
rm answers.txt

echo 'extension=mongo.so' | sudo tee /etc/php5/mods-available/mongo.ini
sudo ln -s /etc/php5/mods-available/mongo.ini /etc/php5/fpm/conf.d/mongo.ini
sudo ln -s /etc/php5/mods-available/mongo.ini /etc/php5/cli/conf.d/mongo.ini

$ php -i | grep 'Mongo'
MongoDB Support => enabled
:sparkles: :sparkles: :sparkles: