web_setup_notes.md

Step 1: Start An EC2 Instance

Start an Ubuntu instance. Show how to SSH into it.

Open ports 80, 3000, 3001, 5432.

Setup subdomain like test.self-loop.com to point to the instance.

Step 2: Install Ruby

• sudo apt-get update
• sudo apt-get install ruby
• sudo apt-get install build-essential patch ruby-dev zlib1g-dev liblzma-dev
  • Required to build native extensions for Ruby.
  • In particular, for Nokogiri.
• sudo apt-get install libsqlite3-dev
• Install Node (needed for Rails):
  • curl -sL https://deb.nodesource.com/setup_11.x | sudo -E bash -
  • sudo apt-get install node
• sudo gem install rails
• sudo rails s -b ec2_domain_name -p 80

Step 3: Use Nginx to Proxy

• sudo apt-get install nginx
  • Use sudo systemctl restart nginx (it will tell you how to read its logs if parsing fails).
  • Can add error_log /home/ubuntu/nginx.log warn; if you want to get more warnings.

Update Nginx configuration at /etc/nginx/sites-enabled/default:

upstream backend {
    server localhost:3000;
    server localhost:3001;
}

server {
    location / {
        proxy_pass http://backend;
        # Make sure any of that try_files crap is cleared out.
    }
}

Step 4: Connect To Postgres Remotely

• sudo apt-get install postgresql libpq-dev
• sudo su postgres and then in psql:
  • CREATE USER ubuntu WITH SUPERUSER LOGIN PASSWORD 'my_secret_password';
• Now you can rails new my_test_application --database=postgresql.
  • set host: localhost and username: ubuntu. I think it will work fine because postgres doesn't require a password if your current username is the same as the postgres user.
  • But as soon as you do things remotely (connect to a box over TCP sockets), you'll need to do some things.
• Edit /etc/postgresql/10/main/postgresql.conf to add listen_addresses='*'. This tells postgresql to listen beyond localhost.
• Next, update /etc/postgresql/10/main/pg_hba.conf to allow md5 (that is, password) authentication.
  • For host, you want all databases, all users, 0.0.0.0/0 for all IP addresses. And of course the method is md5.
• Of course, sudo systemctl restart postgresql.