DigitalOcean VPS with ruby 2.0.0

01-install.sh

#login by ssh
cat ~/.ssh/id_rsa.pub | ssh [machine-user]@[machine-ip] "cat >> ~/.ssh/authorized_keys"

#first login 
ssh root@[machine-ip]

#update repository
sudo apt-get update

#install required softwares
sudo apt-get install build-essential zlib1g-dev libreadline6-dev libyaml-dev libcurl4-openssl-dev libssl-dev libxslt-dev libxml2-dev git curl nodejs

#install ruby 2.0.0 -> go to step 7

#install bundler
gem install bundler --no-ri --no-rdoc

#install passenger
gem install passenger --no-ri --no-rdoc

#install nginx - with default configs
passenger-install-nginx-module

#nginx service commands
cd /tmp
wget -O init-deb.sh http://library.linode.com/assets/660-init-deb.sh
mv init-deb.sh /etc/init.d/nginx

#nginx servie change authorization
chmod 777 /etc/init.d/nginx

#create dir on nginx folder
mkdir /opt/nginx/sites-enabled

#config to start on init
/usr/sbin/update-rc.d -f nginx defaults

#install mongodb
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
sudo apt-get install mongodb-10gen

#add deployer user
adduser deployer #define password and type ENTER for defaults configs and Y to confirm

#add root privileges
/usr/sbin/visudo
# User to privilege specification file
root    ALL=(ALL:ALL) ALL 
[machine-user]  ALL=(ALL:ALL) ALL

#Disable the Password for Root Login
sudo nano /etc/ssh/sshd_config
PermitRootLogin without-password #change this setting on file

#logout
exit

#deployer user login by ssh
cat ~/.ssh/id_rsa.pub | ssh deployer@[machine-ip] "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys"

#for login with deployer
ssh deployer@[machine-ip]

02-capistrano.sh

#Gemfile
gem "capistrano", :group => :development
gem "therubyracer", :group => :assets

#install
bundle install

#Adds a ./Capfile and a ./config/deploy.rb
capify .

#config deploy.rb and Capfile

#setup
cap deploy:setup

#deploy
cap deploy

03-deploy.rb

require "bundler/capistrano" 

set :application, "your_app_name"
set :user       , "deployer_user"
set :server_ip  , 'server_ip'

set :scm        , :git
set :repository ,  "repository_url"
set :branch     , "master"

set :deploy_via, :remote_cache
set :deploy_to, "/home/#{user}/apps/#{application}"

set :use_sudo, false

default_run_options[:pty] = true
ssh_options[:forward_agent] = true

server server_ip, :web, :app, :db, primary: true

namespace :deploy do
  task :setup_config, roles: :app do
    sudo "ln -nfs #{current_path}/config/nginx.conf /opt/nginx/sites-enabled/#{application}"
    run  "mkdir -p #{shared_path}/uploads"
  end
  after "deploy:setup", "deploy:setup_config"

  task :start do ; end
  task :stop  do ; end
  task :restart, :roles => :app, :except => { :no_release => true } do
    run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
  end

  task :create_uploads_symlink, roles: :web do
    puts "CREATING simlink to uploads folder"
    run "ln -nfs #{shared_path}/uploads #{current_path}/public/uploads"
  end
  after "deploy", "deploy:create_uploads_symlink"
end

04-Capifile

load 'deploy'
load 'deploy/assets'
load 'config/deploy' # remove this line to skip loading any of the default tasks

05-nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    passenger_root /var/lib/gems/1.9.1/gems/passenger-4.0.5;
    passenger_ruby /usr/bin/ruby1.9.1;

    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server_names_hash_bucket_size  64;
    include /opt/nginx/sites-enabled/*;

    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443;
    #    server_name  localhost;

    #    ssl                  on;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_timeout  5m;

    #    ssl_protocols  SSLv2 SSLv3 TLSv1;
    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers   on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

06-rails_root-config-nginx.conf

server {
  listen 80;
  server_name yourdomain.com;
  root /home/deployer/apps/yourapp/current/public;   # <--- be sure to point to 'public'!
  passenger_enabled on;
}

07-update_ruby_2_0_0.sh

#1. remove ruby-stable or ruby-ichi
sudo apt-get remove ruby-stable
sudo apt-get remove ruby-ichi

#2. download ruby-ni
wget -O - http://apt.hellobits.com/hellobits.key | sudo apt-key add -

#2.1 add to repository 
echo 'deb http://apt.hellobits.com/ precise main' | sudo tee /etc/apt/sources.list.d/hellobits.list

#3. install ruby package
sudo apt-get update
$ sudo apt-get install ruby-ni

#4. verify ruby version
ruby -v

#thanks nando viera :)
#i just copied it from: http://simplesideias.com.br/instalando-o-ruby-dois-ponto-zero-no-ubuntu