Tutorial: Deploy a Rails app using Capistrano

Go to Tools | Start SSH session. In the invoked dialog, specify the web server address and credentials for your deployment user. Click OK.

tip

To quickly connect to your remote servers, create SSH configurations for them. Learn more at Add an SSH configuration.

Install packages required for building Ruby from sources, installing Passenger, working with SQLite, and so on. Also, install Node.js and Yarn to manage JavaScript dependencies.

sudo apt-get update
sudo apt-get install curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev software-properties-common libffi-dev dirmngr gnupg apt-transport-https ca-certificates nodejs yarn

Install rbenv as described in the Basic GitHub Checkout chapter. Then, follow the instructions from Installation to install the ruby-build plugin required for compiling and installing Ruby.

Install the Ruby distribution used by the application by executing the following commands.

rbenv install 2.6.3
rbenv global 2.6.3

Finally, install Bundler to manage the project gems.

gem install bundler

To install Passenger packages, execute the commands below.

#(a) Install the PGP key
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7

#(b) App the APT repository
sudo sh -c 'echo deb https://oss-binaries.phusionpassenger.com/apt/passenger bionic main > /etc/apt/sources.list.d/passenger.list'
sudo apt-get update

#(c) Install Passenger and Nginx module
sudo apt-get install -y libnginx-mod-http-passenger

#(d) Make sure the configuration files exist
if [ ! -f /etc/nginx/modules-enabled/50-mod-http-passenger.conf ]; then sudo ln -s /usr/share/nginx/modules-available/mod-http-passenger.load /etc/nginx/modules-enabled/50-mod-http-passenger.conf ; fi
sudo ls /etc/nginx/conf.d/mod-http-passenger.conf

Now we need to point Passenger to the correct version of Ruby. Open the mod-http-passenger.conf configuration file with Nano.

sudo nano /etc/nginx/conf.d/mod-http-passenger.conf

Then change the passenger_ruby option in the following way.

passenger_ruby /home/deploy/.rbenv/shims/ruby;

Save the mod-http-passenger.conf file and close it.

Let's remove the default Nginx server ...

sudo rm /etc/nginx/sites-enabled/default

... and add one for our sample application.

sudo nano /etc/nginx/sites-enabled/sample_rails_app

In the opened sample_rails_app file, specify the following configuration.

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

  server_name _;
  root /home/deploy/sample_rails_app/current/public;
  passenger_enabled on;
  passenger_app_env staging;
}

Finally, start the Nginx service.

sudo service nginx start

First, we'll create a separate branch used to deploy our application. Press Alt0`, select Branches in the invoked popup, and then choose New Branch. In the Create New Branch dialog, specify the branch name (capistrano-deploy in our case) and click Create.

Open the project Gemfile and add the following Capistrano gems.

gem 'capistrano',                 '3.11.2'
gem 'capistrano-rails',           '1.4.0'
gem 'capistrano-rbenv',           '2.1.4 '
gem 'capistrano-passenger',       '0.2.0'

Place the caret at any of the highlighted gems and press AltEnter to install them using Bundler.

To capify the application, select Tools | Capistrano | Capify Application from the main menu. The following files will be added to the project.

• Capfile

• config/deploy.rb

• staging.rb and production.rb in the config/environments directory

Note that Tools | Capistrano | Capify Application executes the cap install command. After running this command, RubyMine creates the run configuration for executing the install task. If necessary, you can customize this configuration to pass specific arguments.

Open the Capfile and add the following lines to load the required dependencies.

require "capistrano/rails"
require "capistrano/rbenv"
require "capistrano/passenger"

In the same file, specify the following settings for rbenv.

set :rbenv_type, :user
set :rbenv_ruby, '2.6.3'

Before configuring deployment settings, commit and push changes to a remote repository. In our tutorial, it will be the capistrano-deploy branch of the sample Rails application.

Open the config/deploy.rb file. Here you need to specify the Git repository details and the deployment path on our web server.

set :application, "sample_rails_app"
set :repo_url, "https://github.com/JetBrains/sample_rails_app"
set :branch, "capistrano-deploy"
set :deploy_to, "/home/deploy/#{fetch :application}"
append :linked_files, "config/master.key"

Finally, open config/deploy/staging.rb and modify it in the following way to point to our web server's address.

server "sample-web-server", user: "deploy", roles: %w{app db web}

Create the staging environment as described in Creating Rails Environments. In our example, the created configuration (config/environments/staging.rb) replicates the development configuration, except the following line.

config.require_master_key = true

This option specifies that the master key used to decrypt credentials should be available on our web server.

Now we need to generate the encrypted credentials.yml.enc file and master.key for encryption/decryption. Open the local terminal by selecting View | Tool Windows | Terminal from the main menu and execute the following commands.

rails secret
EDITOR="mine" bin/rails credentials:edit

The config/master.key and config/credentials.yml.enc files will be generated. Add the config/credentials.yml.enc file to VCS as described in Add files to Git.

Since the config/master.key file should be placed outside VCS, we need to create a custom task to upload this file to our web server. Open the lib/capistrano/tasks directory in the Project view Alt01 and create a new setup.rake file with the following content.

namespace :deploy do
  namespace :check do
    before :linked_files, :set_master_key do
      on roles(:app), in: :sequence, wait: 10 do
        unless test("[ -f #{shared_path}/config/master.key ]")
          upload! 'config/master.key', "#{shared_path}/config/master.key"
        end
      end
    end
  end
end

Commit and push changes to the remote repository.

Press Ctrl twice and type cap staging deploy in the invoked popup. Press Enter to start deploying.

Wait until Capistrano makes all the steps required to deploy the application. You can see the progress in the Run tool window Alt04.

Open the browser and specify the application address. In our case, it will be http://sample-web-server.

Open the Run/Debug Configuration dialog in one of the following ways:

• Select Run | Edit Configurations from the main menu.

• With the Navigation bar visible (View | Appearance | Navigation Bar), choose Edit Configurations from the run/debug configuration selector.

  

• Press AltShiftF10 and then press 00.

In the opened Run/Debug Configurations dialog, select the required configuration in the Capistrano group, and specify its settings.

For example, you can specify the following settings in the Configuration tab: