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=====Install rbenv and Dependencies=====

First, install the dependencies required to install Ruby:

**sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel**

if anything breaks the installation, remove the particular dependency and install the other packages
Once the dependencies download, you can install rbenv itself. Clone the rbenv repository from GitHub into the directory ~/.rbenv

=====git clone git://github.com/sstephenson/rbenv.git .rbenv=====

Next, add ~/.rbenv/bin to your $PATH so that you can use the rbenv command line utility. Do this by altering your ~/.bashrc file so that it affects future login sessions:

**echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile**

Then add the command eval "$(rbenv init -)" to your ~/.bashrc file so rbenv loads automatically:

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

** exec $SHELL **

Next, apply the changes you made to your ~/.bashrc file to your current shell session:

**source ~/.bashprofile**

Verify that rbenv is set up properly by using the type command, which will display more information about the rbenv command:

**type rbenv**

Your terminal window will display something starts with rbenv is a function

===== Installing Ruby with ruby-build =====

Next, install the ruby-build, plugin. This plugin adds therbenv install command, which simplifies the installation process for new versions of Ruby:

**git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build**
**echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bash_profile**
**exec $SHELL**

with the ruby-build plugin now installed, you can install versions of Ruby y may need through a simple command. First, let’s list all the available versions of Ruby:

**rbenv install -l**

if the above command throws error, you need to close the terminal and open the terminal again to load bashrc file, setting up rbenv


Let’s install Ruby 2.6.3

**rbenv install 2.6.3**

Once it’s done installing, set it as our default version of Ruby with the global sub-command

**rbenv global 2.6.3**

Verify that Ruby was properly installed by checking its version number:

**ruby -v**

Gems are the way Ruby libraries are distributed. You use the gem command to manage these gems

When you install a gem, the installation process generates local documentation. This can add a significant amount of time to each gem’s installation process, so turn off local documentation generation by creating a file called ~/.gemrc which contains a configuration setting to turn off this feature

**echo "gem: --no-document" > ~/.gemrc**

Bundler is a tool that manages gem dependencies for projects. Install the Bundler gem, particularly the version 2.1.4

**gem install bundler -v 2.1.4**

=====Installing MySQL=====

To install it, update the package index on your server with apt

**sudo apt update**

Then install the default package

**sudo apt install mysql-server**

This will install MySQL latest version. below will install mysql 5.7, As part of installation you provide necessary input to set password for the root user


===== Deploy the application ===== 

create application deployment folder

**mkdir performexa_production**
**cd /home/expdev01/performexa_production**

create 3 files inside
1. Capfile
2. config/deploy.rb
3. config/deploy/production.rb

**Capfile**

  # Load DSL and set up stages
  require 'capistrano/setup'
  require 'capistrano/deploy'
  require 'capistrano/bundler'
  require 'capistrano/rails'
  require 'capistrano/rbenv'
  set :rbenv_type, :expdev01
  set :rbenv_ruby, '2.6.3'
  require 'capistrano/rbenv'
  require 'capistrano/bundler'
  require 'capistrano/rails/migrations'
  require 'capistrano/passenger'
  Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
  
**config/deploy.rb**

  lock '3.16.0'
  set :bundle_binstubs, -> { '/deploy/performance/shared/bundle/ruby/2.6.3/bin/' }
  set :application, 'performexa'
  set :log_level, :debug
  set :pty, false
  set :deploy_to, '/deploy/performance'
  set :deploy_via, 'clone'
  set :scm, :svn
  set :repo_url,  'https://repos.exphosted.com/svnrepos/talent/trunks/performance/trunk'
  #set :repo_url,  'https://repos.exphosted.com/svnrepos/talent/trunks/performance/branches/1.0.9.0-JACK'
  #branch = (ENV["BRANCH"] || "")
  #coreurl = 'https://repos.exphosted.com/svnrepos/talent/trunks/performance/'
  #if branch == ""
  #        set :repo_url, "#{coreurl}/trunk"
  #else
  #        set :repo_url, "#{coreurl}/branches/#{branch}"
  #end
  set :format, :pretty
  set :log_level, :debug
  set :linked_files, %w{config/api.yml config/database.yml config/chat.yml config/newrelic.yml}
  #set :linked_dirs, %w{log }
  set :linked_dirs, %w{config/environments public/system log tmp/pids}
  #todo 
  before 'deploy:starting','deploy:svn_username'
  before 'deploy:starting','deploy:remove_old_scm','deploy:verify_scm'
  before 'deploy:starting','deploy:check_write_permissions'
  before 'deploy:starting', 'god:stop', 'deploy:maint'
  before "deploy:updated", "database:backup"
  #after  "deploy:updated", "static_assets:compile"
  after "deploy:updated", "god:start","deploy:prod"
  after "deploy:reverted", "god:start","deploy:prod" 
  #after 'deploy:publishing', 'deploy:restart'
  #after 'deploy:finishing', 'deploy:cleanup'
  #after 'deploy:publishing', 'deploy:restart'
  
**config/deploy/production.rb**
  set :rails_env, "production"
  set :user, "expdev01"
  server 'localhost',user: fetch(:user),roles: %w{web app db search mastdb}
  set :ssh_options, { :forward_agent => true }

===== Install capistrano gem =====

install capistrano and dependent gems
  
  gem install rails -v ‘6.0.0’
  gem install capistrano        
  gem install capistrano-rbenv     
  gem install capistrano-rails   
  gem install capistrano-bundler 
  gem install capistrano3-puma

=====Install passenger+nginx=====
we used passenger with nginx in this application. So install passenger gem first

**gem install passenger –no-rdoc –no-ri**

we need to uninstall the nginx module that comes with os first then need to install nginx with passenger module

**sudo apt-get purge nginx nginx-full nginx-light nginx-naxsi nginx-common**

**sudo rm -rf /etc/nginx**

above  commands will completely uninstall the nginx 

then install nginx with passenger module

**passenger-install-nginx-module**

Next, need to validate nginx installation through below commands. 

**rvmsudo passenger-config validate-install**

**rvmsudo passenger-memory-stats**

these commands will list you nginx process with pid as well passenger process with pid

to restart nginx we need to kill the existing process and then start nginx service

**sudo kill $(cat /opt/nginx/logs/nginx.pid)**

**sudo /opt/nginx/sbin/nginx**


now, edit Nginx config file to respond performexa application

file name  **/opt/nginx/conf/nginx.conf**

inside http block add below set of code
    
    passenger_root /home/expdev01/.rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/passenger-6.0.8;
    passenger_ruby /home/expdev01/.rbenv/versions/2.6.3/bin/ruby;
    passenger_min_instances 1;
    passenger_max_pool_size 3;
    passenger_pre_start "http://performexa.exphosted.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;
    
add blow set of code to server block

        listen              443 ssl;
      	server_name         performexa.exphosted.com;
      	server_name         *.performexa.exphosted.com;
     	ssl_certificate     /opt/nginx/conf/ssl/performexa.crt;
	ssl_certificate_key /opt/nginx/conf/ssl/performexa.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 production;
	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;
	}
	location / {
		proxy_set_header Host $host;
                #proxy_set_header X-Real-IP  $remote_addr;
                #proxy_set_header X-Forwarded-Proto https;
                #proxy_set_header X-Forwarded-Proto $scheme;
                #proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
	}

reference 
**https://www.phusionpassenger.com/library/install/nginx/install/oss/rubygems_rvm/**

Once all the gems installed successfully, we can start the deployment with capistrano command. Actual deployment directory is ‘/deploy/performance’. Run the below command inside ‘/home/expdev01/performexa_production’

**cap production deploy** 

once  the deployment is success, need to restart the application using below 2 commands

**sudo kill $(cat /opt/nginx/logs/nginx.pid)**
**sudo /opt/nginx/sbin/nginx**

=====Install ejabberd service=====

  1. https://www.process-one.net/en/ejabberd/downloads/
  2. choose Download the "Linux x86 64-bits Installer".
  3. chmod +x ejabberd-YY.MM-linux-x64.run
  4. ./ejabberd-YY.MM-linux-x64.run

provide necessary inputs. In domain name you need to give the proper subdomain name, example ‘performexa.exphosted.com’

after the installation there should be ejabberd-21.04 folder in /home/expdev01

**start ejabberd**
 
cd ejabberd-21.04
./bin/ejabberdctl start

**Access ejabberd sevice**

To access ejabberd sevice under http/https ports, we need to allow access to 5280 and 5281 ports
usually to check this we need to give below command
telnet ip_address port_number
ex: telner 127.0.0.1 5280

if we have access for that port will be connected.
Now open the ejabberd admin panel in the browser
https://performexa.exphosted.com:5281/admin/

provide username and password when we gave while installing ejabberd service
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