DOWNLOAD >> Ubuntu Server 18.04.2 LTS
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rbenv
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https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-18-04
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sudo apt install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm5 libgdbm-dev
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
source ~/.bashrc

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build

rbenv install -l
rbenv install 2.6.3
rbenv global 2.6.3
ruby -v

echo "gem: --no-document" > ~/.gemrc
gem install bundler

gem install rails
rbenv rehash
rails -v

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mysql
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https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-18-04
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sudo apt install mysql-server libmysqld-dev
sudo mysql_secure_installation

sudo mysql -u root -p

sudo vi /etc/mysql/conf.d/mysql.cnf
>>>
[mysqld]
character-set-server = utf8mb4
[mysql]
default-character-set = utf8mb4
<<<
sudo service mysql restart

sudo mysql -u root -p
mysql> create user '<database user>'@'localhost' identified by '<database password>';
mysql> grant all privileges on * . * to '<database user>'@'localhost';

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thetis
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sudo mysql -u root -p
mysql> create database thetis_production;

cd /var/www
sudo git clone git://github.com/sysphonic/thetis

#git reset --hard
#git pull origin master

cd thetis
bundle install
sudo chmod a+x bin/*
# rails app:update:bin
EDITOR="vi" bin/rails credentials:edit
vi config/database.yml
>>>
  socket: /var/run/mysqld/mysqld.sock
...
  username: <database user>
<<<
bin/rails db:migrate RAILS_ENV=production THETIS_DATABASE_PASSWORD=<database password>
RAILS_ENV=production bundle exec rake assets:precompile assets:clean

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apache2
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https://tutorials.ubuntu.com/tutorial/install-and-configure-apache
https://www.phusionpassenger.com/library/install/apache/install/oss/bionic/
https://www.phusionpassenger.com/library/deploy/apache/deploy/ruby/
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sudo apt install apache2

sudo apt install -y dirmngr gnupg
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7
sudo apt install -y apt-transport-https ca-certificates
sudo sh -c 'echo deb https://oss-binaries.phusionpassenger.com/apt/passenger bionic main > /etc/apt/sources.list.d/passenger.list'
sudo apt update
sudo apt install -y libapache2-mod-passenger

sudo a2enmod passenger
sudo apache2ctl restart

sudo /usr/bin/passenger-config validate-install
sudo /usr/sbin/passenger-memory-stats

sudo apt update
sudo apt upgrade

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sudo a2dissite 000-default

sudo mkdir <host dir>
cd /var/www/<host dir>
sudo chown -R <username>:root <host dir>

sudo ln -s /var/www/thetis/public thetis

sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/thetis.conf
sudo vi /etc/apache2/sites-available/thetis.conf
>>>
<VirtualHost *:80>
  DocumentRoot /var/www/<host dir>

‥‥

  # config/database.yml
  SetEnv THETIS_DATABASE_PASSWORD <database password>
  # $ bin/rails secret
  SetEnv SECRET_KEY_BASE <secret key base>

  RailsBaseURI /thetis
  # $ passenger-config about ruby-command
  PassengerRuby /home/<username>/.rbenv/versions/2.6.3/bin/ruby

  <Directory /var/www/<host dir>/thetis>
    AllowOverride all
    Options -MultiViews
  </Directory>

‥‥

<<<
sudo a2ensite thetis

sudo systemctl reload apache2

#vi /var/log/apache2/error.log
# ===>  /Message