A quick tutorial on installing passenger, Nginx, Ruby and Rails on Ubuntu 12.04 (without RVM/without rbenv)

installing_passenger_nginx_ror_on_ubuntu_without_rvm_rbenv

When installing passenger, Nginx, Ruby and Rails on Ubuntu 12.04 (without RVM/without rbenv):

First: installing Ruby (without RVM):

	sudo apt-get update

	sudo apt-get install ruby1.9.1 ruby1.9.1-dev \
	  rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 \
	  build-essential libopenssl-ruby1.9.1 libssl-dev zlib1g-dev
	
	sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 400 \
	         --slave   /usr/share/man/man1/ruby.1.gz ruby.1.gz \
	                        /usr/share/man/man1/ruby1.9.1.1.gz \
	        --slave   /usr/bin/ri ri /usr/bin/ri1.9.1 \
	        --slave   /usr/bin/irb irb /usr/bin/irb1.9.1 \
	        --slave   /usr/bin/rdoc rdoc /usr/bin/rdoc1.9.1
	
	# choose your interpreter
	# changes symlinks for /usr/bin/ruby , /usr/bin/gem
	# /usr/bin/irb, /usr/bin/ri and man (1) ruby
	sudo update-alternatives --config ruby
	sudo update-alternatives --config gem
	
	# now try
	ruby --version


Second: installing Rails:
	gem install rails

Third: installing passenger:
	gem install passenger 

Forth: installing nginx:
	Either:
		sudo /opt/ruby/bin/passenger-install-nginx-module --auto --prefix=/opt/nginx/ --auto-download --extra-configure-flags=--with-http_ssl_module
	OR: 
		sudo passenger-install-nginx-module

Fifth: Use this script for init.d service for Nginx:
	wget -O init-deb.sh http://library.linode.com/assets/660-init-deb.sh 
	sudo mv init-deb.sh /etc/init.d/nginx 
	sudo chmod +x /etc/init.d/nginx 
	sudo /usr/sbin/update-rc.d -f nginx defaults

	after that you can control nginx with:
		sudo /etc/init.d/nginx stop 
		sudo /etc/init.d/nginx start 
		sudo /etc/init.d/nginx restart
		
	NOTE: if those commands failed for another process using the same port, do this:
		passenger-memory-stats
	and then kill all the processes of nginx to start with a clean slate.  
		
		
	At this point, nginx should be running, and you can make sure by visiting you www.MYDOMAIN.com and you'll see a message like "Welcome to Nginx ...."
	
	Also you can verify that nginx and passenger are working by checking the processes andtheir status in memory:
		passenger-memory-stats
		
		
Sixth: configuring nginx to access your rails app:
	Using vim, Access the nginx.conf file:
		vim /opt/nginx/conf/nginx.conf
	
	That's the block you need to edit:	
		http {
		    
			...
		    
			server {
		        listen 80;
		        server_name www.MYDOMAIN.com;
		        root /path/to/my/rails/app/public;  ### MAKE SURE TO POINT TO PUBLIC FOLDER
		        passenger_enabled on;
		    }
		    
			...
			
			### NOW COMMENT THE FOLLOWING BLOCK AND ALL LINES IN BETWEEN:
			#location / {
			#	root html;
			#	.......
			#	.....
			#}
			
		}
		
	Save the conf file, then restart nginx
		sudo /etc/init.d/nginx restart
	Also if you have a rails app already deployed, it doesn't hurt to restart it by doing: 
		touch /pathtorailsapp/tmp/restart.txt



========================
Sources:
	https://www.digitalocean.com/community/articles/how-to-install-rails-and-nginx-with-passenger-on-ubuntu
	http://ivanvanderbyl.github.io/2011/01/14/rails-nginx-passenger-ubuntu.html
	http://www.modrails.com/documentation/Users%20guide%20Nginx.html#_deploying_to_a_virtual_host_8217_s_root
	

If you're using a Cent-OS like system (like Amazon's AMI) where you don't have apt-get, I've written something that might help: https://neeto.io/b69AwLSK

Thank you perfect exact plug and play it works for me on Ubuntu 17.10