David Lanner dlanner

README

The example below creates a TCP server listening on a stream (i.e. SOCK_STREAM) socket. A similar approach can be followed to create a UDP server on a datagram (i.e. SOCK_DGRAM) socket. See man systemd.socket for details.

An example server

Create an simple echo server at ~/tmp/foo/serve.py.

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?

Are your Ruby HTTPS API calls secure?

Let's check:

2.0.0-p481 :001 > OpenSSL::SSL::SSLContext::DEFAULT_PARAMS
 => {:ssl_version=>"SSLv23", :verify_mode=>1, :ciphers=>"ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW", :options=>-2147482625}
2.0.0-p481 :002 > rating = JSON.parse(RestClient::Resource.new("https://www.howsmyssl.com/a/check" ).get)['rating']
 => "Bad"

	#!/bin/bash
	#
	# Usage: cloudsearch-clone-domain <domain> <newdomain>
	#
	# After you run this script, you'll have a file named define-fields-<newdomain>.sh, which
	# you can run to re-create all the fields from the cloned domain. If you haven't yet created
	# the new CS domain, then run `aws cloudsearch create-domain --domain-name <newdomain>` before
	# running the define-fields script that is produced by this script.

	die () {

	function wait (timeout) {
	return new Promise((resolve) => {
	setTimeout(() => {
	resolve()
	}, timeout)
	})
	}

	async function requestWithRetry (url) {
	const MAX_RETRIES = 10

	#!/bin/bash

	# Usage: ./init.sh once to initialize remote storage for this environment.
	# Subsequent tf actions in this environment don't require re-initialization,
	# unless you have completely cleared your .terraform cache.
	#
	# terraform plan -var-file=./production.tfvars
	# terraform apply -var-file=./production.tfvars

	tf_env="production"

	cd into /tmp/kitchen.
	/opt/chef/embedded/bin/gem install chef-zero
	/opt/chef/embedded/bin/chef-zero -d
	knife cookbook upload -a -c client.rb
	chef-shell -z -c client.rb -o '<YOUR RECIPE>'

	#!/usr/bin/python
	# -- coding: utf-8 --

	import subprocess


	__all__ = ["transform"]
	__version__ = '0.3'
	__author__ = 'Christoph Burgmer <cburgmer@ira.uka.de>'
	__url__ = 'https://github.com/cburgmer/upsidedown'

	#!/bin/sh
	grep pam_tid /etc/pam.d/sudo >/dev/null \|\| echo auth sufficient pam_tid.so \| cat - /etc/pam.d/sudo \| sudo tee /etc/pam.d/sudo > /dev/null