A bash script for quickly setting up NginX, PostreSQL, ruby, thin, and an app user on a Debian-like system

provision

#!/bin/bash
# Provisioning script for an Ubuntu server to run a PostgreSQL server, NginX,
# and a Rack application behind a thin server, which can be deployed with
# Capistrano.
#
# This script needs to be run as root
#
# When it's run, you will still need to add your deploy users to the group, so
# that they can actually act on behalf of the named application user. And,
# obviously, they will need an account into which they can SSH, so you'll need
# their public key.

NAME=boobs
DATABASE=YES
WEB=YES
APP=YES
RUBY_VERSION=2.0

apt-get update -y

if [ "$WEB" = "YES" ] ; then
  apt-get -y install nginx
  ln -fs /var/www/$NAME/current/config/nginx.conf /etc/nginx/sites-available/$NAME
  ln -fs /etc/nginx/sites-available/$NAME /etc/nginx/sites-enabled/$NAME
fi

if [ "$DATABASE" = "YES" ] ; then
  apt-get -y install postgresql postgresql-contrib
  sudo -u postgres createuser -dSR $NAME
fi

if [ "$APP" = "YES" ] ; then
  apt-get -y install git build-essential
  cd /tmp && rm -rf ruby-install
  git clone git://github.com/postmodern/ruby-install && cd ruby-install && make install
  ruby-install --no-reinstall ruby $RUBY_VERSION
  cd /tmp && rm -rf chruby
  git clone git://github.com/postmodern/chruby && cd chruby && make install
  d=/usr/local/share/chruby
  f=/etc/profile.d/chruby.sh
  echo "[ \"$BASH\" ] && [ -f $d/chruby.sh ] && . $d/chruby.sh"  > $f
  echo "[ \"$BASH\" ] && [ -f $d/auto.sh ]   && .   $d/auto.sh" >> $f
  . $f
  chruby $RUBY_VERSION
  gem install thin --conservative
  thin install -f
  update-rc.d -f thin defaults
  ln -sf /var/www/$NAME/current/config/thin.yml /etc/thin/$NAME
  useradd -rmU -s /bin/bash -b /var/www -c "$NAME app service runner" $NAME
  chmod 2775 /var/www/$NAME
  mkdir -p -m 700 /var/www/$NAME/.ssh
  f=/etc/sudoers.d/$NAME
  echo "Cmnd_Alias   START = /etc/init.d/thin start   -C /etc/thin/$NAME"  > $f
  echo "Cmnd_Alias    STOP = /etc/init.d/thin stop    -C /etc/thin/$NAME" >> $f
  echo "Cmnd_Alias RESTART = /etc/init.d/thin restart -C /etc/thin/$NAME" >> $f
  echo "%$NAME ALL=(ALL) NOPASSWD: START,STOP,RESTART"                    >> $f
  chmod 0440 $f
fi