Automate installation of mongodb

install_mongodb.sh

#!/bin/bash

PKG=mongodb-linux-x86_64-2.2.0
URL=http://fastdl.mongodb.org/linux

if [ -f /etc/init.d/mongod ]
then
  echo "mongod already installed ... stopping"
  sudo service mongod stop
else
  echo "installing mongod script"
  wget https://raw.github.com/gist/3516078/713ad981715236473999f30636bca2ee3dcc5f24/mongod
  sudo mv mongod /etc/init.d/mongod
  sudo chmod +x /etc/init.d/mongod
  echo "creating mongodb user"
  sudo useradd mongodb
  echo "creating directories"
  sudo mkdir -p /var/lib/mongodb
  sudo mkdir -p /var/log/mongodb
  sudo chown mongodb.mongodb /var/lib/mongodb
  sudo chown mongodb.mongodb /var/log/mongodb
  sudo update-rc.d mongod defaults
fi

wget $URL/$PKG.tgz
sudo tar -xvzf $PKG.tgz -C /usr/local/

if [ -d /usr/local/mongodb ]
then
  echo "removing existing mongodb symlink"
  sudo rm -rf /usr/local/mongodb
  sudo ln -s /usr/local/$PKG /usr/local/mongodb
else
  echo "creating symlinks"
  sudo ln -s /usr/local/$PKG /usr/local/mongodb
  sudo ln -s /usr/local/mongodb/bin/bsondump /usr/local/bin/bsondump
  sudo ln -s /usr/local/mongodb/bin/mongo /usr/local/bin/mongo
  sudo ln -s /usr/local/mongodb/bin/mongod /usr/local/bin/mongod
  sudo ln -s /usr/local/mongodb/bin/mongodump /usr/local/bin/mongodump
  sudo ln -s /usr/local/mongodb/bin/mongoexport /usr/local/bin/mongoexport
  sudo ln -s /usr/local/mongodb/bin/mongofiles /usr/local/bin/mongofiles
  sudo ln -s /usr/local/mongodb/bin/mongoimport /usr/local/bin/mongoimport
  sudo ln -s /usr/local/mongodb/bin/mongorestore /usr/local/bin/mongorestore
  sudo ln -s /usr/local/mongodb/bin/mongos /usr/local/bin/mongos
  sudo ln -s /usr/local/mongodb/bin/mongosniff /usr/local/bin/mongosniff
  sudo ln -s /usr/local/mongodb/bin/mongostat /usr/local/bin/mongostat
fi

echo "cleaning up"
rm $PKG.tgz

echo "starting mongod service"
sudo service mongod start