Andrew Fecheyr andruby

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

ErgoDox EZ

All about the ErgoDox EZ

Configuring your ErgoDox
Information about the ErgoDox EZ

Make it real

Ideas are cheap. Make a prototype, sketch a CLI session, draw a wireframe. Discuss around concrete examples, not hand-waving abstractions. Don't say you did something, provide a URL that proves it.

Ship it

Nothing is real until it's being used by a real user. This doesn't mean you make a prototype in the morning and blog about it in the evening. It means you find one person you believe your product will help and try to get them to use it.

	<template lang='pug'>
	div.drop-zone(:class='{dragging: isDragging }'
	@dragover.prevent='dragover'
	@dragenter.prevent='dragover'
	@drop.prevent.stop='onDrop'
	@dragleave.prevent='dragleave')
	div(:class='{ hidden: uploadInProgress }' @click='openFileBrowser')
	slot
	i {{label}}
	input(type='file' :multiple='multiple' ref='input' style='display: none')

	#! /usr/bin/env python2

	"""
	encfs-agent

	Mounts encfs filesystems with passwords generated using private keys stored in ssh-agent.
	You can have any number of encrypted filesystems ("vaults") under VAULTS_DIR. Password for
	each of them is derived from its name and given private key stored in ssh-agent.
	You can use ssh-askpass for ssh-agent if you want.

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>D3 Ternary Plot</title>
	<style>
	line.axis {
	stroke-width: 2;
	stroke: #363636;
	}

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	bash -c '
	<% if knife_config[:bootstrap_proxy] -%>
	(
	cat <<'EOP'
	<%= "proxy = #{knife_config[:bootstrap_proxy]}" %>
	EOP
	) > ~/.curlrc
	<% end -%>

	if [ ! -f /usr/bin/chef-client ]; then