Khaja Minhajuddin minhajuddin

Raspberry pi dashboard

This is what we did to setup a few dashboards at platanus

You'll need

Raspberry Pi
Dashing Service
Wifi stick (optional)

Let's Encrypt on Ubuntu 14.04, nginx with webroot auth

This document details how I setup LE on my server. Firstly, install the client as described on http://letsencrypt.readthedocs.org/en/latest/using.html and make sure you can execute it. I put it in /root/letsencrypt.

As it is not possible to change the ports used for the standalone authenticator and I already have a nginx running on port 80/443, I opted to use the webroot method for each of my domains (note that LE does not issue wildcard certificates by design, so you probably want to get a cert for www.example.com and example.com).

Configuration

For this, I placed config files into etc/letsencrypt/configs, named after <domain>.conf. The files are simple:

	defmodule Ticker do
	require Logger
	# public api
	def start(recipient_pid, tick_interval, duration \\ :infinity) do
	# Process.monitor(pid) # what to do if the process is dead before this?
	# start a process whose only responsibility is to wait for the interval
	ticker_pid = spawn(__MODULE__, :loop, [recipient_pid, tick_interval, 0])
	# and send a tick to the recipient pid and loop back
	send(ticker_pid, :send_tick)
	schedule_terminate(ticker_pid, duration)

	defmodule HttpRequester do
	use GenServer

	def start_link(_) do
	GenServer.start_link(__MODULE__, nil, [])
	end

	def fetch(server, url) do
	# Don't use cast: http://blog.elixirsips.com/2014/07/16/errata-dont-use-cast-in-a-poolboy-transaction/
	timeout_ms = 10_000

	" settings
	colorscheme molokai

	let loaded_matchparen=1 " don't automatically highlight the matching parens
	let mapleader = ' '
	let maplocalleader = ' '
	set autowriteall " autosave files
	set background=dark
	set clipboard=unnamedplus " Yanks go on clipboard
	set cmdheight=2

	<!doctype html>


	<div id='output'>Output: </div>
	<input type="text" id="op1" placeholder="Input 1" />
	<br>
	<input type="text" id="op2" placeholder="Input 2" />
	<br>
	<button onclick="calculate()">Add</button>

	<!doctype html>


	<div id='output'>Output: </div>
	<input type="text" id="op1" placeholder="Input 1" />
	<br>
	<input type="text" id="op2" placeholder="Input 2" />
	<br>
	<button onclick="calculate()">Add</button>

	// run it using
	// node loop_array_length.js
	// =>
	// bad 7 ms
	// good 5 ms
	var a = []
	for (var i = 0; i < 10000000; i++) {
	a.push(i);
	}

	# Phoenix Framework - A productive web framework that does not compromise speed and maintainability

	[Unit]
	Description=Phoenix Framework ISControl Application
	After=network.target

	[Service]
	Type=simple
	User=deployer
	RemainAfterExit=yes

	defmodule MyList do
	# [ 1 , 2, 3, [ 1, 2]]
	def flatten(list) do
	do_flatten(list, [])
	end

	def do_flatten([h\|t], acc_list) when is_list(h) do
	# this may be expensive!
	do_flatten(h ++ t, acc_list)
	end