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Ruby on Rails 6 : Install2021/09/22

 
Install Ruby on Rails 6 to build Ruby Framework environment.
[1]
[2] Install some other required packages.
root@dlp:~#
apt -y install ruby2.7-dev build-essential libxml2 libxml2-dev libmariadb-dev zlib1g-dev libxslt-dev nodejs npm git
[3] Install Rails 6.
root@dlp:~#
gem install bundler

root@dlp:~#
gem install nokogiri -- --use-system-libraries

root@dlp:~#
gem install rails --version="~>6.0"

root@dlp:~#
rails -v

Rails 6.1.4.1
[4] Create a sample application and make sure it works normally.
Install MariaDB Server for this sample app, refer to here.
root@dlp:~#
npm install --global yarn

root@dlp:~#
gem install mysql2 -- --with-mysql-config=/usr/bin/mariadb_config

root@dlp:~#
rails new SampleApp -d mysql

root@dlp:~#
cd SampleApp

root@dlp:~/SampleApp#
vi config/database.yml
default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: root       # MariaDB connection user
  password: password   # MariaDB connection password
  host: localhost

root@dlp:~/SampleApp#
vi config/application.rb
module SampleApp
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.1
    # line 13 : specify hosts
    # if not specified, users can access to only [localhost] and IP address
    # if allow all sub-domain, specify domain name like follows
    config.hosts << ".srv.world" 

# create sample application

root@dlp:~/SampleApp#
rails db:create

Created database 'SampleApp_development'
Created database 'SampleApp_test'
root@dlp:~/SampleApp#
rails generate scaffold testapp name:string title:string body:text

root@dlp:~/SampleApp#
rails db:migrate

== 20210922072203 CreateTestapps: migrating ===================================
-- create_table(:testapps)
   -> 0.2033s
== 20210922072203 CreateTestapps: migrated (0.2038s) ==========================

root@dlp:~/SampleApp#
rails server --binding=0.0.0.0

=> Booting Puma
=> Rails 6.1.4.1 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.5.0 (ruby 2.7.4-p191) ("Zawgyi")
*  Min threads: 5
*  Max threads: 5
*  Environment: development
*          PID: 21307
* Listening on http://0.0.0.0:3000
Use Ctrl-C to stop
[5] Access to the [http://(server's hostname or IP address):3000/] from a client computer. It's OK if following site is displayed normally.
  Access to [http://(server's hostname or IP address):3000/testapps/], then it's possible to use sample app like follows.
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