setup a Ubuntu server for hosting ruby on rails application using nginx and passenger

install_nginx_passenger_for_ubuntu.sh

#! /bin/bash

# -------------------------------------------
# The purpose of this script is to help you
# setup a production server for RubyOnRails 
# applications quickly.
# 
# It will 
#   + install nginx, passenger, git, nodejs
#     and RVM
#   + create user for the ruby app
#   + fetch app code from configured source
# 
# Script tested on Ubuntu 16.04 LTS
# 
# Usage
#  1. Update configurations
#  2. sudo ./nginx_passenger_for_ubuntu.sh
#  3. Follow instructions on NEXT part
# -------------------------------------------

# configurations
APP_NAME=MyApp
WWW_PATH=/var/www
GITHUB_URI=https://github.com/user/MyApp.git
APP_USER=red
RUBY_VERSION=2.2.1

SERVER_NAME=yourdomain.com
SERVER_SCHEME=http://

# check user privilege
if [[ "$EUID" -ne 0 ]]; then
    echo "Error: please run with sudo."
    exit 
fi

apt update && apt upgrade -y

# Install passenger's PGP key and add HTTPS support for APT
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 561F9B9CAC40B2F7
sudo apt-get install -y apt-transport-https ca-certificates

# Add passenger's APT repository
sudo sh -c 'echo deb https://oss-binaries.phusionpassenger.com/apt/passenger xenial main > /etc/apt/sources.list.d/passenger.list'
sudo apt-get update

# Install Passenger + Nginx
sudo apt-get install -y nginx-extras passenger
sed -i 's_# include /etc/nginx/passenger.conf;_include /etc/nginx/passenger.conf;_' /etc/nginx/nginx.conf

service nginx restart

# check passenger config 
# /usr/bin/passenger-config validate-install

# check if passenger is loaded by nginx
/usr/sbin/passenger-memory-stats


# install RVM
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
\curl -sSL https://get.rvm.io | bash -s stable

echo "# update path
export PATH=$PATH:/usr/local/rvm/bin" >> ~/.bashrc
source ~/.bashrc

# add app user
adduser --disabled-password --gecos "" $APP_USER

# Install git and download code 
apt install -y git nodejs
cd $WWW_PATH
mkdir $APP_NAME
cd $APP_NAME
git clone $GITHUB_URI code
cd ..
chown -R $APP_USER: $APP_NAME

echo '
# NEXT: 

# # As root:
# rvm install "$RUBY_VERSION"
# rvm use "$RUBY_VERSION"
# gem install bundler

# # As $APP_USER:
# cd $WWW_PATH/$APP_NAME/code 
# bundle install # --deployment --without development test # may fail if no Gemfile.lock
# bundle exec rake secret > /tmp/_rb_dummy_txt
# SEC=$(</tmp/_rb_dummy_txt)
# rm /tmp/_rb_dummy_txt
# sed -i 's/<%=ENV["SECRET_KEY_BASE"]%>/$SEC' config/secrets.yml
# chmod 700 config db
# chmod 600 config/database.yml config/secrets.yml
# bundle exec rake assets:precompile db:migrate RAILS_ENV=production
# RAILS_ENV=production bundle exec rake db:reset
# RUBY_RUN_PATH=`passenger-config about ruby-command 2>/dev/null|awk '/Command:/ {print $2; exit}'|sed 's/Command://'`

# # As root:
# echo "server {
#     listen 80;
#     server_name $SERVER_NAME;
#     root /var/www/$APP_NAME/code/public;
#     passenger_enabled on;
#     passenger_ruby $RUBY_RUN_PATH;
# }" > /etc/nginx/sites-enabled/$APP_NAME.conf
# service nginx restart

# # Test 
# curl $SERVER_SCHEME$SERVER_NAME

# For more, reference
# https://www.phusionpassenger.com/library/walkthroughs/deploy/ruby/ownserver/nginx/oss/xenial/deploy_app.html

'