[RUBY] Try deploying Rails app to EC2-Part 2 (Deploy)-

About this article

We will proceed on the premise of the contents of the first part. Please create a GitHub repository in advance. This time, we will deploy a Rails application using EC2.

(Part 1) https://qiita.com/kotobuki562/items/92827bcf99d89b350445 (Part 2-Database construction-) https://qiita.com/kotobuki562/items/92827bcf99d89b350445

Register SSH key on GitHub

First, let's register the SSH key to clone the GitHub repository to EC2. If you don't register your SSH key, EC2 won't be able to connect to GitHub.

Execute the following command in EC2. When you execute it, you may be asked for various inputs. In that case, press "Enter". If successful, something like a figure such as "RSA 4096" will be output.

[ec2-user@ip-111-11-11-111 ~]$ ssh-keygen -t rsa -b 4096

Let's take a look at the contents of the SSH key with the cat command. Execute the following command.

[ec2-user@ip-111-11-11-111 ~]$ cat ~/.ssh/id_rsa.pub

Then go to GirHub and register your SSH key Access from the URL below and copy the SSH key confirmed by the cat command earlier. Please give any name you like to the title of the SSH key on GitHub side. https://github.com/settings/keys

After registering the key, execute the following command. After execution, you will be asked yes / no, so please wash yes. After that, access is completed.

[ec2-user@ip-111-11-11-111 ~]$ ssh -T [email protected]

Application server

This time, we will create an application server using "unicorn". If you haven't installed the unicorn Gem yet, install it first.

This time we will build in a production environment.


group :production do
  gem unicorn

Next, create unicorn.rb in config and write it as follows. I will describe it as a sample, but you can set it yourself.


app_path = File.expand_path('../../', __FILE__)

worker_processes 1

working_directory app_path

pid "#{app_path}/tmp/pids/unicorn.pid"

listen 3000

stderr_path "#{app_path}/log/unicorn.stderr.log"

stdout_path "#{app_path}/log/unicorn.stdout.log"

timeout 60

preload_app true
GC.respond_to?(:copy_on_write_friendly=) && GC.copy_on_write_friendly = true

check_client_connection false

run_once = true

before_fork do |server, worker|
  defined?(ActiveRecord::Base) &&

  if run_once
    run_once = false

  old_pid = "#{server.config[:pid]}.oldbin"
  if File.exist?(old_pid) && server.pid != old_pid
      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
      Process.kill(sig, File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH => e
      logger.error e

after_fork do |_server, _worker|
  defined?(ActiveRecord::Base) && ActiveRecord::Base.establish_connection

Clone your GitHub repository

Next, let's create a directory for cloning from GitHub. After creating the directory, we will pass the permissions to the EC2 user, so

[ec2-user@ip-111-11-11-111 ~]$ sudo mkdir /var/www/
[ec2-user@ip-111-11-11-111 ~]$ sudo chown ec2-user /var/www/

Clone GitHub to the directory you created. Go to the directory and run the git clone command. Finally, let's apply the gem with bundle install.

[ec2-user@ip-111-11-11-111 ~]$ cd /var/www/
[ec2-user@ip-111-11-11-111 www ~]$git clone paste the copied URL
[ec2-user@ip-111-11-11-111 app ~]$ bundle install

Next, set the environment variables. Execute the following command. Make a copy of it when it comes out.

[ec2-user@ip-111-11-11-111 <Repository name> ~]$ rake secret

Next, we will actually describe the environment variables. Let's execute the following command and describe it.

[ec2-user@ip-111-11-11-111 ~]$ sudo vim /etc/environment

Set the database environment variables set in the previous chapter. Let's describe the following two points

DATABASE_PASSWORD='Database root user password'
SECRET_KEY_BASE='The secret created earlier_key_base'

Now you are ready.

EC2 port open

Let's go back to EC2 on the web and open the port. Release the port number 3000 of unicorn.rb described earlier. The setting method is described in the first part, so please check there. Please set as shown in the image below.

スクリーンショット 2020-11-11 12.01.11.png


First, edit the local database.yml. Please edit as follows. Do not edit the database.


  <<: *default
  database: app_production
  username: root
  password: <%= ENV['DATABASE_PASSWORD'] %>
  socket: /var/lib/mysql/mysql.sock

Let's go back to EC2 on the terminal and do a git pull.

[ec2-user@ip-111-11-11-111 <Repository name>] git pull origin master

Let's create and migrate a database in EC2. You are now ready.

[ec2-user@ip-111-11-11-111 <Repository name>]$ rails db:create RAILS_ENV=production
[ec2-user@ip-111-11-11-111 <Repository name>]$ rails db:migrate RAILS_ENV=production

Now let's reflect the assets directory with assets: orecompile. Finally, start the server with bundle exec unicorn_rails.

[ec2-user@ip-111-11-11-111 <Repository name>]$ rails assets:precompile RAILS_ENV=production
[ec2-user@ip-111-11-11-111 <Repository name>]$ bundle exec unicorn_rails -c config/unicorn.rb -E production -D

Execute the following command to confirm that the startup has been confirmed.

[ec2-user@ip-111-11-11-111 <Repository name>]$ ps aux | grep unicorn

#The following process is output.

ec2-user  5879  0.0 13.0 515244 131640 ?Sl November 09 0:02 unicorn_rails master -c config/unicorn.rb -E production -D
ec2-user  5887  0.0 12.6 525216 127600 ?Sl November 09 0:02 unicorn_rails worker[0] -c config/unicorn.rb -E production -D
ec2-user 15917  0.0  0.0 119436   976 pts/0    S+   03:26   0:00 grep --color=auto unicorn

To stop it, write the following command.

[ec2-user@ip-111-11-11-111 <Repository name>]$ kill 5879 #Stop process ID

After killing the process, execute the following command and check if it is actually reflected in the browser. You can access it at http: // : 3000 /.

[ec2-user@ip-111-11-11-111 <Repository name>]$ RAILS_SERVE_STATIC_FILES=1 unicorn_rails -c config/unicorn.rb -E production -D

Error log

Finally, if an error occurs after deployment, execute the following command and check the error log. Let's access the error log storage location described earlier in unicorn.rb.

[ec2-user@ip-111-11-11-111 <Repository name>]$ less log/unicorn.stderr.log

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