Category Archives: MongoDB

Installing MongoDb on Ubuntu Hardy from source with init.d and data dir

After setting up mongo by hand for 2 servers that are not deployed via puppet, here is a bash script to do it…


sudo su root

cd /opt/ && /usr/bin/curl -OL http://downloads.mongodb.org/linux/mongodb-linux-x86_64-1.4.1.tgz && tar -zxvf mongodb-linux-x86_64-1.4.1.tgz && ln -s /opt/mongodb-linux-x86_64-1.4.1 /opt/mongodb

useradd mongod -u 5005

curl http://gist.github.com/raw/413433/834a3d0ecc96cb36f8918f6d01b65fc082025cc0/gistfile1.sh > /etc/init.d/mongodb

chown mongod:mongod /etc/init.d/mongodb
chmod 750 /etc/init.d/mongodb

mkdir /etc/mongodb
chown mongod:mongod /etc/mongodb
chmod 750 /etc/mongodb

echo "dbpath=/opt/mongodb-data/" > /etc/mongodb/mongodb.conf
chown mongod:mongod /etc/mongodb/mongodb.conf
chmod 750 /etc/mongodb/mongodb.conf

mkdir /opt/mongodb-data
chown mongod:mongod /opt/mongodb-data
chmod 750 /opt/mongodb-data

Maximum and minimum for MongoMapper

A small hack to get minimum/maximum functionality on MongoMapper, its not 100% secure(can be wrong when inserting twice at the same time etc), but good enought for our usecase 😉

Usage

  User.maximum(:friend_count)
  User.minimum(:friend_count)

Code

module MongoMapper::Document::ClassMethods
  def maximum(column)
    first(:order => "#{column} desc").try(column)
  end

  def minimum(column)
    first(:order => "#{column} asc").try(column)
  end
end