System preparation
apt install curl git gnupg2 nodejs
Install RVM
Go to the site rvm.io and look at the installation commands:
gpg2 --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB curl -sSL https://get.rvm.io | bash -s stable
Add a user to the group:
vim /etc/group
rvm:x:1001:ubuntu
My username in the system – ubuntu
Then from the user:
source /etc/profile.d/rvm.sh
Find out the version of RVM:
rvm --version
View a list of Ruby versions available for installation:
rvm list known
Install the latest version of Ruby:
rvm install "ruby-2.5.1"
The list of installed Ruby versions and the default can be found as follows:
rvm list
Let’s see the gem version and update it:
gem -v gem update --system
InstallRails:
gem install rails
Create application
Create a test application:
rails new example_app -T
Go to the directory of our application:
cd example_app
Let’s create for the test index.html
vim public/index.html
Insert there the following:
<!DOCTYPE html>
<html>
<head>
<title>Ruby</title>
</head>
<body>
Example Ruby App
</body>
</html>
Run for test on all interfaces:
bundle exec rails s -p 3000 -b '0.0.0.0' => Booting Puma => Rails 5.2.2 application starting in development => Run `rails server -h` for more startup options Puma starting in single mode... * Version 3.12.0 (ruby 2.5.1-p57), codename: Llamas in Pajamas * Min threads: 5, max threads: 5 * Environment: development * Listening on tcp://0.0.0.0:3000 Use Ctrl-C to stop
Check in the browser:
1.2.3.4:3000
Where 1.2.3.4 is the IP address of the computer where the application is running
If the computer has a graphical shell, you can omit the IP address when launching the application, and enter the browser by localhost. Also without graphics, the localhost can be checked with a cursor or a console browser.
You can stop the application – Ctrl-C
Git
Being in the root of our application, we initialize the repository:
git init Reinitialized existing Git repository in /home/ubuntu/heroku/example_app/.git/
Check status:
git status
On branch master
No commits yet
Untracked files:
(use "git add <file>..." to include in what will be committed)
.gitignore
.ruby-version
Gemfile
Gemfile.lock
README.md
Rakefile
app/
bin/
config.ru
config/
db/
lib/
log/
package.json
public/
storage/
tmp/
vendor/
nothing added to commit but untracked files present (use "git add" to track)
Add all files:
git add .
And we are doing a commit:
git commit -am "Add Ruby files to repo"
Check:
git status
On branch master
No commits yet
Changes to be committed:
(use "git rm --cached <file>..." to unstage)
new file: .gitignore
new file: .ruby-version
new file: Gemfile
new file: Gemfile.lock
new file: README.md
new file: Rakefile
new file: app/assets/config/manifest.js
new file: app/assets/images/.keep
new file: app/assets/javascripts/application.js
new file: app/assets/javascripts/cable.js
new file: app/assets/javascripts/channels/.keep
new file: app/assets/stylesheets/application.css
new file: app/channels/application_cable/channel.rb
new file: app/channels/application_cable/connection.rb
new file: app/controllers/application_controller.rb
new file: app/controllers/concerns/.keep
new file: app/helpers/application_helper.rb
new file: app/jobs/application_job.rb
new file: app/mailers/application_mailer.rb
new file: app/models/application_record.rb
new file: app/models/concerns/.keep
new file: app/views/layouts/application.html.erb
new file: app/views/layouts/mailer.html.erb
new file: app/views/layouts/mailer.text.erb
new file: bin/bundle
new file: bin/rails
new file: bin/rake
new file: bin/setup
new file: bin/spring
new file: bin/update
new file: bin/yarn
new file: config.ru
new file: config/application.rb
new file: config/boot.rb
new file: config/cable.yml
new file: config/credentials.yml.enc
new file: config/database.yml
new file: config/environment.rb
new file: config/environments/development.rb
new file: config/environments/production.rb
new file: config/environments/test.rb
new file: config/initializers/application_controller_renderer.rb
new file: config/initializers/assets.rb
new file: config/initializers/backtrace_silencers.rb
new file: config/initializers/content_security_policy.rb
new file: config/initializers/cookies_serializer.rb
new file: config/initializers/filter_parameter_logging.rb
new file: config/initializers/inflections.rb
new file: config/initializers/mime_types.rb
new file: config/initializers/wrap_parameters.rb
new file: config/locales/en.yml
new file: config/puma.rb
new file: config/routes.rb
new file: config/spring.rb
new file: config/storage.yml
new file: db/seeds.rb
new file: lib/assets/.keep
new file: lib/tasks/.keep
new file: log/.keep
new file: package.json
new file: public/404.html
new file: public/422.html
new file: public/500.html
new file: public/apple-touch-icon-precomposed.png
new file: public/apple-touch-icon.png
new file: public/favicon.ico
new file: public/index.html
new file: public/robots.txt
new file: storage/.keep
new file: tmp/.keep
new file: vendor/.keep
Heroku
We register on heroku.com and go to the account.
For the convenience of working with Heroku, install their CLI
sudo snap install --classic heroku
Installation for distributions other than Ubuntu can be viewed on the website Heroku
Check:
heroku --version heroku/7.19.4 linux-x64 node-v11.3.0
Log in to Heroku CLI:
heroku login
We press any key and get the authorization URL, copy it to the browser, log in.
Let’s create an application on Heroku:
heroku create Creating app... done, ⬢ my-generated-app-name-83844 https://my-generated-app-name-83844.herokuapp.com/ | https://git.heroku.com/my-generated-app-name-83844.git
Now in the Gemfile it is necessary to replace “sqlite3” with “postgres“, otherwise Heroku will give the following error:
remote: An error occurred while installing sqlite3 (1.3.13), and Bundler cannot remote: continue. remote: Make sure that `gem install sqlite3 -v '1.3.13'` succeeds before bundling. remote: remote: In Gemfile: remote: sqlite3 remote: remote: ! remote: ! Failed to install gems via Bundler. remote: ! Detected sqlite3 gem which is not supported on Heroku: remote: ! https://devcenter.heroku.com/articles/sqlite3 remote: ! remote: ! Push rejected, failed to compile Ruby app.
Open Gemfile
vim Gemfile
Find at the beginning of the file record of sqlite3
gem 'sqlite3'
And we transfer it to the block “group :development, :test do”
To get the following:
group :development, :test do # Call 'byebug' anywhere in the code to stop execution and get a debugger console gem 'byebug', platforms: [:mri, :mingw, :x64_mingw] gem 'sqlite3' end
Before this block, add a new block:
group :production do gem 'pg' end
Save changes to the file.
Reinstall without postgres.
bundle install --without production
Add files, commit and push to Heroku:
git add . git commit -am "Heroku" git push heroku master
Check:
heroku open
In response, we get the URL by which we can check the application on Heroku.