Eric Ripa eripa

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?

README

Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services, no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.

Let's create a example foo service that when started creates a file, and when stopped it deletes it.

Define setup/teardown actions

Create executable file /opt/foo/setup-foo.sh:

Linux Backup Solutions

I've been looking for the best Linux backup system, and also reading lots of HN comments.

Instead of putting pros and cons of every backup system I'll just list some deal-breakers which would disqualify them.

Also I would like that you, the HN community, would add more deal breakers for these or other backup systems if you know some more and at the same time, if you have data to disprove some of the deal-breakers listed here (benchmarks, info about something being true for older releases but is fixed on newer releases), please share it so that I can edit this list accordingly.

Amanda (comments by sammcj)

It has a lot of management overhead and that's a problem if you don't have time for a full time backup administrator.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	#!/bin/bash

	set -o errexit

	echo "Removing exited docker containers..."
	docker ps -a -f status=exited -q \| xargs -r docker rm -v

	echo "Removing dangling images..."
	docker images --no-trunc -q -f dangling=true \| xargs -r docker rmi

	# Install QEMU OSX port with ARM support
	sudo port install qemu +target_arm
	export QEMU=$(which qemu-system-arm)

	# Dowload kernel and export location
	curl -OL \
	https://github.com/dhruvvyas90/qemu-rpi-kernel/blob/master/kernel-qemu-4.1.7-jessie
	export RPI_KERNEL=./kernel-qemu-4.1.7-jessie

	# Download filesystem and export location

	-- Save this file to ~/Library/Application Support/Microsoft/Office/Outlook Script Menu Items folder on your ma
	tell application "Microsoft Outlook"
	set totalSize to 0
	set msgs to current messages
	set myDocumentFolder to POSIX path of (path to documents folder as string)
	set myAttachmentsFolder to myDocumentFolder & "Attachments"
	tell application "Finder"
	if not (exists myAttachmentsFolder) then
	#make new folder at myDocumentFolder with properties {name:"Attachments"}
	do shell script "mkdir -p " & quoted form of myAttachmentsFolder

	#!/bin/sh

	# iohyve v0.2.5 2015/05/06 "ALL HAIL LINUS edition"

	# Process command line
	__parse_cmd () {
	while [ $# -gt 0 ] ; do
	case "$1" in
	version) __version
	exit

	#!/bin/bash

	###############################################################################
	# NOTICE: This script is intended to be used in conjunction with a openssl.cnf
	# template such as this one:
	# https://gist.github.com/jameskyle/8106d4d5c6dfa5395cef
	# (C) Copyright 2014 James A. Kyle.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.