Deploying rails app

Go to your home directory and check out your source code.

cd ~
git clone /path/to/my_project.git

Go to your project directory.

cd my_project

Install the required gems.

bundle install

Update your production database credential in database.yml

production:
  <<: *default
  host: 127.0.0.1
  port: 3306
  database: database_name
  username: database_user
  password: password

Generate your production secret key base:

rake secret

Copy the generate key into secrets.yml

production:
  secret_key_base: your_key_here

Update your production configuration in /config/environments/production.rb, such as SMTP info, and other credentials.

Update the timezone of the app in application.rb

config.time_zone = 'Kuala Lumpur'

Create database and generate schema

rake db:create db:migrate db:seed

Precompile assets and resources

rake assets:clean assets:precompile

Next, create a server block in your Nginx config to serve this app. For example:

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        server_name your_domain.com;
        passenger_enabled on;
        rails_env production;
        root /home/username/my_project/public;
}

You will also need to adjust ulimit of your machine. The default value is usually not production ready. You can check the value by executing the command below.

ulimit -n

To set a custom value, create a file in limits.d:

sudo pico /etc/security/limits.d/mylimits.conf

Then and the following lines into the file and save it. Log-out and log-in your terminal and check the ulimit value again to make sure it takes effect. The value can be adjusted base on your need.

* soft nofile 10000
* hard nofile 10000
* soft nproc 10000
* hard nproc 10000

Next, in your nginx.conf, modify the events connection value.

worker_processes auto;
events {
        worker_connections 10000;
}

Next, update the maximum client body size to a greater value if you intend to upload large file such as images.

http {
        client_max_body_size 5m;
}

Finally, restart your Nginx server.