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sudo apt-get install python-software-properties
# Node.js
sudo apt-get purge nodejs npm
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs
# mongodb
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
sudo touch /etc/apt/sources.list.d/10gen.list
echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/10gen.list
sudo apt-get update
sudo apt-get install mongodb-10gen
# redis
sudo add-apt-repository ppa:chris-lea/redis-server
sudo apt-get update
sudo apt-get install redis-server