Nginx configuration generator for port-forwarding with reverse proxy

README.md

Nginx configuration generator for port-forwarding with reverse proxy

How to use

Write your config like conf.example and

$ cat your_config | ruby run.rb

How to forward request via ssh(port forwarding)

Synopsis

$ ssh -g -N user@subdomain.somedomain.com -R '*:4001:localhost:3000'

Option details

• -g

Means 'Allows remote hosts to connect to local forwarded ports'

• -N

Means 'Do not execute a remote command. This is useful for just forwarding ports (protocol version 2 only)'

• -R '*:4001:localhost:3000'

Means 'Forward request to remote:4001 to localhost:3000'

Reverse proxy server tips

• Configure GatewayPorts in sshd_config to yes

License

MIT License

conf.erb

        # <%= @name %>
        server {
                server_name <%= @host %>;
                location / {
                        proxy_pass http://127.0.0.1:<%= @port %>;
                        proxy_set_header X-Forwarded-Host $host;
                }
        }

conf.example

| 7001 | a.example.com | Bill Gates |
| 7002 | b.example.com | Steve Ballmer |
| 7003 | c.example.com | xxx |
| 7004 | d.example.com | xxx |
| 7005 | e.example.com | xxx |

conf.rb

require 'erb'

class Conf
  BLANK_NAME = 'xxx'

  def initialize(line)
    process line
  end

  # Read line and store values
  # Sample data:
  #     | 4001 | fujimura.somewhere.com | 藤村 |
  #
  def process line
    _, @port, @host, @name, _ = line.split("|").map(&:strip)
    unless @port && @host && @name
      raise StandardError.new %|Invalid line :"#{line}"|
    end
  end


  # Return configuration block of reverse proxy seting for nginx
  #
  def to_conf
    return nil if @name == BLANK_NAME
    return nil if [@name, @host, @port].any?(&:nil?)
    ERB.new(File.read('./conf.erb')).result(binding)
  end

end

run.rb

require './conf'

STDIN.read.split("\n").each do |line|
  conf = Conf.new(line).to_conf
  puts conf unless conf.nil?
end

TODO.md

• Support configuration file format other than textile