[ruby-on-rails] Change a Rails application to production

How can I change my Rails application to run in production mode? Is there a config file, environment.rb for example, to do that?

In Rails 3

Adding Rails.env = ActiveSupport::StringInquirer.new('production') into the application.rb and rails s will work same as rails server -e production

module BlacklistAdmin
  class Application < Rails::Application

    config.encoding = "utf-8"
    Rails.env = ActiveSupport::StringInquirer.new('production')

    config.filter_parameters += [:password]
  end
end

This would now be

rails server -e production

Or, more compact

rails s -e production

It works for rails 3+ projects.

Change the environment variable RAILS_ENV to production.

for default server : rails s -e production

for costum server port : rails s -p [port] -e production, eg. rails s -p 3002 -e production

If you're running on Passenger, then the default is to run in production, in your apache conf:

<VirtualHost *:80>
  ServerName application_name.rails.local
  DocumentRoot "/Users/rails/application_name/public"
  RailsEnv production ## This is the default
</VirtualHost>

If you're just running a local server with mongrel or webrick, you can do:

./script/server -e production

or in bash:

RAILS_ENV=production ./script/server

actually overriding the RAILS_ENV constant in the enviornment.rb should probably be your last resort, as it's probably not going to stay set (see another answer I gave on that)

RAILS_ENV=production rails s

OR

rails s -e production

By default environment is developement.

You can also pass the environment to script/server:

$ script/server -e production

$> export RAILS_ENV=production

Please make sure you have done below in your environment.rb file.

ENV['RAILS_ENV'] ||= 'production'

If you application runs in shared hosting environment or phushion passenger, you might need to need make changes in .httaccess (inside public folder) and set mode as production.

rails s -e production

This will run the server with RAILS_ENV = 'production'.

Apart from this you have to set the assets path in production.rb

config.serve_static_assets = true

Without this your assets will not be loaded.

It is not a good way to run rails server in production environment by "rails server -e production", because then rails runs as a single-threaded application, and can only respond to one HTTP request at a time.

The best article about production environment for rails is Production Environments - Rails 3

As others have posted: rails server -e production

Or, my personal fave: RAILS_ENV=production rails s

By default server runs on development environment: $ rails s

If you're running on production environment: $ rails s -e production or $ RAILS_ENV=production rails s

If mipadi's suggestion doesn't work, add this to config/environment.rb

# force Rails into production mode when                          
# you don't control web/app server and can't set it the proper way                  
ENV['RAILS_ENV'] ||= 'production'