ruby : 2.2.3
rubygems : 2.4.5 
rails : 4.2.4

Add below mentioned both entrys 

127.0.0.1 server url
<serverip> server url

#This was tested in CentOS 6.5.

yum install epel-release -y
yum update -y
yum groupinstall "Development Tools" -y
yum groupinstall "Additional Development" -y
yum install gcc gcc-c++ make wget libtool libxml libxml-devel libxslt libxslt-devel subversion curl-devel java-1.7.0-openjdk java-1.7.0-openjdk-devel git-core openssl-devel -y
yum install ImageMagick ImageMagick-devel -y
yum install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel -y

useradd -m expdev01
vi /etc/sudoers
expdev01	ALL=(ALL)	NOPASSWD: ALL ##add this line
su - expdev01

a) Install rbenv

# Check out rbenv into ~/.rbenv.
git clone https://github.com/sstephenson/rbenv.git ~/.rbenv

# Add ~/.rbenv/bin to your $PATH for access to the rbenv command-line utility.
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile 
# Ubuntu Desktop note: Modify your ~/.bashrc instead of ~/.bash_profile.

echo 'eval "$(rbenv init -)"' >> ~/.bash_profile


# Restart your shell so that PATH changes take effect. (Opening a new terminal tab will usually do it.) 
# Now check if rbenv was set up -
type rbenv
#=> "rbenv is a function"

b) Install rbenv-build

git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

c) Install ruby 2.2.3

rbenv install 2.2.3

d) Update rubygems to 2.4.5

rbenv global 2.2.3 #make this version of ruby global
rbenv rehash #reload shims
gem -v #check the gem version (Most likely this will be 2.4.5.1)
gem install rubygems-update 
update_rubygems
gem update --system '2.4.5' 
mkdir -p ~/.rbenv/plugins
git clone git://github.com/dcarley/rbenv-sudo.git ~/.rbenv/plugins/rbenv-sudo

yum install wget -y
wget http://repo.mysql.com/mysql-community-release-el6-5.noarch.rpm
rpm -ivh mysql-community-release-el6-5.noarch.rpm
yum install mysql-community-server.x86_64  -y

/etc/init.d/mysqld start


mysql -u root

mysql> use mysql;
mysql> update user set password=PASSWORD("GIVE-NEW-ROOT-PASSWORD") where User='root';
mysql> flush privileges;
mysql> quit

Install Passenger and Nginx

passenger-install-nginx-module

copy the nginx.conf file from "/opt/nginx/conf/nginx.conf" from existing machine to the new machine on the same location and change "server_name" and "passenger_pre_start" 

server_name         newqa01.performexa.com;
passenger_pre_start "http://newqa01.performexa.com/";


vi /opt/nginx/conf/nginx.conf

worker_processes  3;
events {
    worker_connections  4096;
    multi_accept        on;
    use                 epoll;
}
http {
    passenger_root /home/expdev01/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/passenger-5.0.18;
    passenger_ruby /home/expdev01/.rbenv/versions/2.2.3/bin/ruby;
    passenger_min_instances 1;
    passenger_max_pool_size 3;
    passenger_pre_start "http://newqa01.performexa.com/";
    client_body_buffer_size 10K;
    client_header_buffer_size 1k;
    client_max_body_size 8m;
    large_client_header_buffers 4 32k;
    client_body_timeout 10;
    client_header_timeout 10;
    send_timeout 12;
    server_tokens off;
    gzip             on;
    gzip_comp_level  2;
    gzip_min_length  1000;
    gzip_proxied     expired no-cache no-store private auth;
    gzip_types       text/plain application/x-javascript text/xml text/css application/xml;
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  15;

server {
  listen 80;
  server_name newqa01.performexa.com;
  rewrite ^/?(.*) https://$host/$1 redirect;
  }
server {
    listen              443 ssl;
    server_name         newqa01.performexa.com;
    ssl_certificate     /opt/nginx/ssl/server.crt;
    ssl_certificate_key /opt/nginx/ssl/server.key;
    ssl_prefer_server_ciphers on;
    ssl_dhparam        /etc/pki/tls/private/dhparam.pem;
    ssl_protocols       TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers         "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
    passenger_enabled on;
    passenger_app_env staging;
    root /deploy/performance/current/public;

    open_file_cache          max=2000 inactive=20s;
    open_file_cache_valid    60s;
    open_file_cache_min_uses 5;
    open_file_cache_errors   off;

    location ~* .(jpg|jpeg|png|gif|ico|css|js)$ {
    expires 365d;
      }
  }
}

copy the ssl folder from existing machine to the new machine ( which contain ssl certificates)

zip -r ssl.zip /opt/nginx/ssl

put it into ftp 

login to the new machine

cd /opt/nginx

connect to ftp and download the ssl.zip file

unzip ssl.zip

copy the nginx.conf file from "/opt/nginx/conf/nginx.conf" from existing machine to the new machine on the same location

change the old machine name with the newone

Download the latest version of Ejabberd from www.process-one.net website, at the time of writing this document 15.07 was the latest.

wget "https://www.process-one.net/downloads/downloads-action.php?file=/ejabberd/15.07/ejabberd-15.07-linux-x86_64-installer.run"
chmod 751 ejabberd-15.07-linux-x86_64-installer.run
./ejabberd-15.07-linux-x86_64-installer.run

Do you accept this license? [y/n]: y
Installation Directory [/opt/ejabberd-15.07]: 
ejabberd server domain [newqa01.performexa.com]: newqa01.performexa.com (Specify the Fully qualified name - Hostname)
Administrator username [admin]: 
Administrator password [********] :
Retype password [********] :
Cluster [y/N]: n
Do you want to continue? [Y/n]: y

----------------------------------------------------------------------------
Please wait while Setup installs ejabberd on your computer.

 Installing
 0% ______________ 50% ______________ 100%
 #########################################

----------------------------------------------------------------------------
cd /opt/ejabberd-15.07/bin
cp ejabberd.init /etc/init.d/ejabberd

/etc/init.d/ejabberd start

1. Change the config settings. Config file can be found in your ejabberd directory under conf (ex - /opt/ejabberd-15.07/conf/ejabberd.yml)

Change “register:” (around line 481)

  register: 
    all: allow
    registration_timeout: infinity

Change “registration_timeout:” (around line 494)

registration_timeout: infinity //(yaml file level)

Enable “mod_ping”

mod_ping:
    send_pings: true
    ping_interval: 250
    timeout_action: none

2. Start/Restart ejabberd

3. Create a shared roster for every one.

4. Add a host entry for the IP pointing to the URL.

vi /opt/ejabberd-15.07/conf/ejabberd.yml

1) insert the below lines  on line number 161 under "http_bind: true" ( search for "http_bind: true")
*******************************************************************************************************

 tls: true
 certfile: "/opt/ejabberd-15.07/conf/server.pem"

2) uncomment and do the changes in Line No: 171 from "optional" to "required"
******************************************************************************
s2s_use_starttls: required

3) uncomment the below mentioned line in Line No: 176
*********************************************************
s2s_certfile: "/opt/ejabberd-15.07/conf/server.pem"

4) set the value for "max_fsm_queue: 25000" in Line No : 375
**************************************************************
max_fsm_queue: 25000

5) search for "register:" in Line No: 483 and place the below line under "all: allow"
***************************************************************************************
registration_timeout: infinity

6) search for "By default the frequency of account registrations from the same IP is limited to 1 account every 10 minutes. To      
   disable, specify: infinity" and place the below mentioned line in Line No:496
*******************************************************************************************************************************
 registration_timeout: infinity

7) search for "mod_ping:" and do the below changes in Line No: 574 ( Hint : remove "[]" in mod_ping )
*******************************************************************************************************
 mod_ping:
         send_pings: true
         ping_interval: 120
         timeout_action: none

Generate the server.pem file

cd /opt/nginx/ssl
cat server.crt server.key > server.pem

cd /opt/ejabberd-15.07/conf 

mv server.pem ejabbert-original-server.pem

cp /opt/nginx/ssl/server.pem .

cd /opt/ejabberd-15.07/conf

chmod 640 server.pem
chown -R ejabberd:root server.pem

gem install capistrano -v 3.4.0
gem install capistrano-bundler -v 1.1.4
gem install capistrano-ext -v 1.2.1
gem install capistrano-log_with_awesome -v 0.0.2
gem install capistrano-passenger -v 0.2.0
gem install capistrano-rails -v 1.1.6
gem install capistrano-rbenv -v 2.0.4
gem install capistrano-stats -v 1.1.1
gem install god -v 0.13.7

mkdir /var/run/god/
chown -R expdev01:expdev01 /var/run/god

To Install mysql2 (Interface)

gem install mysql2 -v '0.3.20'

The Application uses bundler gem to manage the gem dependencies. Install the bundler gem first.

sudo gem install bundler

Once the bundler gem is installed, from the application directory (eg: /deploy/crossbow/current), run

bundle install

This would install all the necessary gems required by the application.

mkdir -p /deploy/performance/current

cd /deploy
mkdir systasks

cd /deploy/performance
mkdir backups
mkdir shared
mkdir releases

cd /home/expdev01

Issue the command from /home/expdev01 to download the configuration files from SVN for performexa staging site
****************************************************************************************************************
svn co https://repos.exphosted.com/svnrepos/tools/scripts/performexa/deployment/staging/performance/

cp -r /home/expdev01/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0 /deploy/performance/shared/bundle/ruby/

cd /home/expdev01/performance
./runcap.sh

copy the build folder from "/home/expdev01/" to "/deploy/performance/releases/" ( eg "1.0.9.0-JACK" folder)
**************************************************************************************************************
cp -r /home/expdev01/1.0.9.0-JACK  /deploy/performance/releases/

cd /deploy/performance

ln -s current /deploy/performance/releases/1.0.9.0-JACK/

cd /deploy/performance/releases/1.0.9.0-JACK/config

mv api.yml bkp-api.yml
mv newrelic.yml bkp-newrelic.yml
mv database.yml bkp-database.yml
mv chat.yml bkp-chat.yml
mv environments bkp-environments


copy the following files from "/deploy/performance/releases/1.0.9.0-JACK/config" directory to "/deploy/performance/shared/config"
*********************************************************************************************************************************
cd /deploy/performance/releases/1.0.9.0-JACK/config

cp api.yml /deploy/performance/shared/config
cp database.yml /deploy/performance/shared/config
cp chat.yml /deploy/performance/shared/config
cp newrelic.yml /deploy/performance/shared/config
cp -r environments /deploy/performance/shared/config

Add the following in "api.yml"  ( e.g - In my case it is staging )
******************************************************************
vi api.yml

staging:
  doorkeeper_token_expire_time: <%= 30.days %>
  enabled_for_subsites: false
  enabled: true

Change the Database name and credentials for staging
*****************************************************
default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: Expertus1@
  host: localhost

production:
  <<: *default
  database: production

staging:
  <<: *default
  database: performance_staging

development:
  <<: *default
  database: performance_development01

#test:
#  <<: *default
#  database: performance_development


Do the changes (server, bosh , websocket , admin_jid and admin_password in staging block in chat.yml)
*****************************************************************************************************
staging:
  server: https://newqa01.performexa.com:5280
  bosh: https://newqa01.performexa.com:5280/http-bind
  websocket: wss://newqa01.performexa.com:5280/websocket
  domain: newqa01.performexa.com
  enabled: true
  create_xmpp_user: true
  reconnect_timeout: 10000
  admin_jid: admin@newqa01.performexa.com
  admin_password: Expertus1@
  push_notifications: true
  stun: {
    host      : 'stun.services.mozilla.com',
    port      : 3478,
    transport : 'udp'
  }

test:
  server: http://qa01.performexa.com:5280
  websocket: ws://qa01.performexa.com:5280/websocket
  domain: qa01.performexa.com
  bosh: http://qa01.performexa.com:5280/http-bind
  enabled: false
  create_xmpp_user: false

production:
  server: http://qa01.performexa.com:5280
  websocket: ws://qa01.performexa.com:5280/websocket
  domain: qa01.performexa.com
  bosh: http://qa01.performexa.com:5280/http-bind
  enabled: false
  create_xmpp_user: false


Do the changes in "/deploy/performance/releases/1.0.9.0-JACK/config/environments/staging.rb"
*********************************************************************************************

APP_URL     = "https://newqa01.performexa.com"
API_URL     = "https://newqa01.performexa.com"
AUTHENTICATION_URL     = "https://newqa01.performexa.com"



Create a symlink from "/deploy/performance/shared/config" directory
********************************************************************
cd /deploy/performance/shared/config/

ln -s /deploy/performance/shared/config/api.yml
ln -s /deploy/performance/shared/config/database.yml
ln -s /deploy/performance/shared/config/chat.yml
ln -s /deploy/performance/shared/config/newrelic.yml
ln -s /deploy/performance/shared/config/environments

copy "/etc/init.d/god" script from qa01.performexa.com and paste into the same location with "newqa01.performexa.com" and changed the ownership of the file file to "expdev01"

chown -R expdev01:expdev01 /etc/init.d/god
chmod 755 /etc/init.d/god

check out the god.sh from the below svn link
execute the below command from /deploy/systasks
cd /deploy/systasks
 svn co https://repos.exphosted.com/svnrepos/tools/scripts/performexa/services/staging/god.sh .

change the ownership and permission

chown -R expdev01:expdev01 /deploy/systasks/god.sh
chmod 755 /etc/init.d/god

start the god service
/etc/init.d/god start

The Application uses bundler gem to manage the gem dependencies. Install the bundler gem first.

sudo gem install bundler

Once the bundler gem is installed, from the application directory (eg: /deploy/crossbow/current), run

bundle install

This would install all the necessary gems required by the application.

bundle install will end with this message:

Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

Modify the database.yml file to reflect proper DB settings in development and test section and then run following rake task to create all the databases.

bundle exec rake db:create:all

Once the DBs are created run the migrations to create necessary tables using following command.

bundle exec rake db:migrate
bundle exec rake db:migrate RAILS_ENV=test

Run rake db:seed to create the default company and related data (This is just one time task)

bundle exec rake db:seed

The default company will be created with name 'Performexa' and subdomain as 'default'. No subdomain in url will refer to default company. e.g. http://dev01.performexa.com will take default company as a context. An admin user for the default company will also be created. The username for admin user is 'admin@performexa.com' and password is 'pforperformance'.