Passenger

Passenger is an open source web application server for ruby. It handles handling HTTP requests, managing processes and resources. It also allows us to view and analyze problems. Passenger is easy to use and deploy to production.

Passenger is an app server like (puma, unicorn, torquebox). Nginx, Apache is a web server.

The passenger then helps you automatically connect between web apps and the web server

If you used to use unicorn to connect rails apps to web server and capistrano to automatically compile assets, package code … then you can use the passerger because it is modern and easier to deploy. Below is a comparison of the speed. It can be said that passenger runs 4 times faster than other ruby ​​web servers.

We all know Unicorn, Puma, Torquebox are all different so fast to be 2 -> 4 times faster is very difficult. However, there are many reasons to help Phusion Passenger faster.

https://www.rubyraptor.org/how-we-made-raptor-up-to-4x-faster-than-unicorn-and-up-to-2x-faster-than-puma-torquebox/

You can refer to the link above.

Deploy with phusion passenger and nginx

1. Install nginx and start nginx
   
   sudo apt-get update sudo apt-get install nginx sudo service nginx start

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   sudo apt-get update sudo apt-get install nginx sudo service nginx start

   
   Nginx as mentioned above will be a web server, which will send requests from user to app server. If the request does not change frequently as css, js, the web server can resolve it without interacting with the app. Thus processing speed will be fast.
2. Passenger installation

   You can install it via gem passenger
   

   gem install passenger

   1 2	gem install passenger

   
   Connect the module to nginx
   
   rvmsudo passenger-install-nginx-module

   1 2	rvmsudo passenger-install-nginx-module

   
   Or install via apt
   
   sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 561F9B9CAC40B2F7

   1 2	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 561F9B9CAC40B2F7

   
   Next, create an APT file:
   
   sudo nano /etc/apt/sources.list.d/passenger.list

   1 2	sudo nano /etc/apt/sources.list.d/passenger.list

   
   Authorize the file and save it
   
   sudo chown ubuntu: /etc/apt/sources.list.d/passenger.list sudo chmod 600 /etc/apt/sources.list.d/passenger.list

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   sudo chown ubuntu: /etc/apt/sources.list.d/passenger.list sudo chmod 600 /etc/apt/sources.list.d/passenger.list

   
   Update and install passenger with nginx
   
   sudo apt-get update sudo apt-get install nginx-extras passenger

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   sudo apt-get update sudo apt-get install nginx-extras passenger

   
   OK so successfully installed the passenger
3. Config nginx

   Open the file /etc/nginx/nginx.conf and leave the comment in two lines
   

   # passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini; # passenger_ruby /usr/bin/ruby;

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   # passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini; # passenger_ruby /usr/bin/ruby;

   
   If not, we can add it in the http block
   
   http { passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini; passenger_ruby /usr/bin/ruby; }

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   http {   passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini;   passenger_ruby /usr/bin/ruby; }

4. Restart nginx
   
   sudo service nginx restart

   1 2	sudo service nginx restart

5. Verify validate installation
   
   rvmsudo passenger-config validate-install * Checking whether this Phusion Passenger install is in PATH... ✓ * Checking whether there are no other Phusion Passenger installations... ✓

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   rvmsudo passenger-config validate-install * Checking whether this Phusion Passenger install is in PATH... ✓ * Checking whether there are no other Phusion Passenger installations... ✓

6. Check out the progress
   
   rvmsudo passenger-memory-stats Version: 5.0.8 Date : 2015-05-28 08:46:20 +0200 ... ---------- Nginx processes ---------- PID PPID VMSize Private Name ------------------------------------- 12443 4814 60.8 MB 0.2 MB nginx: master process /usr/sbin/nginx 12538 12443 64.9 MB 5.0 MB nginx: worker process ### Processes: 3 ### Total private dirty RSS: 5.56 MB ----- Passenger processes ------ PID VMSize Private Name -------------------------------- 12517 83.2 MB 0.6 MB PassengerAgent watchdog 12520 266.0 MB 3.4 MB PassengerAgent server 12531 149.5 MB 1.4 MB PassengerAgent logger ...

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   rvmsudo passenger-memory-stats Version: 5.0.8 Date   : 2015-05-28 08:46:20 +0200 ...   ---------- Nginx processes ---------- PID    PPID   VMSize   Private  Name ------------------------------------- 12443  4814   60.8 MB  0.2 MB   nginx: master process /usr/sbin/nginx 12538  12443  64.9 MB  5.0 MB   nginx: worker process ### Processes: 3 ### Total private dirty RSS: 5.56 MB   ----- Passenger processes ------ PID    VMSize    Private   Name -------------------------------- 12517  83.2 MB   0.6 MB    PassengerAgent watchdog 12520  266.0 MB  3.4 MB    PassengerAgent server 12531  149.5 MB  1.4 MB    PassengerAgent logger ...

7. Create rails app, database, bundle, gem environments

   For example, app /var/www/html/passenger-app/public contains the source code of the app

8. Config web server Create a config file to connect to your passenger-app rails passenger-app
   
   sudo vi /etc/nginx/sites-available/passenger-app

   1 2	sudo vi /etc/nginx/sites-available/passenger-app

   
   Add config
   
   server { listen 80 default_server; server_name www.xxx.com; passenger_enabled on; root /var/www/html/passenger-app/public; }

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   server {    listen 80 default_server;    server_name www.xxx.com;    passenger_enabled on;    root /var/www/html/passenger-app/public; }

   
   Save and create symlinks
   
   sudo ln -s /etc/nginx/sites-available/passenger-app /etc/nginx/sites-enabled/passenger-app

   1 2	sudo ln -s /etc/nginx/sites-available/passenger-app /etc/nginx/sites-enabled/passenger-app

9. Reset nginx and see results
   
   sudo service nginx restart

   1 2	sudo service nginx restart