John Dyer LBRapid

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?

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macOS 10.14 Mojave Mostly-Automated Setup

An easy to refer to document for regularly setting up macOS 10.14 Mojave.

Controversy

The topic of recipe-based frequent fresh reinstalls of macOS is a controversial issue. Some people are against reinstalling macOS, citing that they have never had an issue with Apple provided upgrade installs.

For MacOS Catalina, visit Install mysql2 on MacOS Catalina

Problem

Installing mysql2 gem errors on MacOS Mojave.

Solution

Make sure openssl is installed on Mac via Homebrew.

	select *
	from item_occurrence
	where timestamp >= unix_timestamp() - 24 * 60 * 60
	and request.url like '%mydomain.com%'

	AXIS_UP ignore
	AXIS_DOWN ignore
	AXIS_LEFT ignore
	AXIS_RIGHT ignore
	MOUSE_BTN3 add volume 5
	MOUSE_BTN4 add volume -5
	MOUSE_BTN5 seek -5
	MOUSE_BTN6 seek 5

	#!/usr/bin/env sh

	# Multiple vulnerabilities have been disclosed in RubyGems:
	# https://www.ruby-lang.org/en/news/2018/02/17/multiple-vulnerabilities-in-rubygems/
	#
	# And again in March 2019:
	# https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html
	#
	# If you're an Rbenv user, here's any easy one-liner to upgrade to a
	# safe version of Rubygems (2.7.8 / 3.0.3 or later) for each installed Ruby version: