u rebornwwp

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?

Guide on how to create and set up a Dockerized web app using Django REST APIs and ReactJS

Hopefully this will answer "How do I setup or start a Django project using REST Framework and ReactJS?"

I created this because it was SUCH a pain in the ass setting up a project using all the latest technologies. After some research, I figured it out and have it working. The repo that implements this is located here. Feel free to use it as a boilerplate ;)

Main features:

Django REST APIs
ReactJS with Redux Pattern
Webpack module bundler manager

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

Enable TCP port 2375 for external connection to Docker

See this issue.
Docker best practise to Control and configure Docker with systemd.

Create daemon.json file in /etc/docker:

 {"hosts": ["tcp://0.0.0.0:2375", "unix:///var/run/docker.sock"]}

	# Detect operating system in Makefile.
	# Author: He Tao
	# Date: 2015-05-30

	OSFLAG :=
	ifeq ($(OS),Windows_NT)
	OSFLAG += -D WIN32
	ifeq ($(PROCESSOR_ARCHITECTURE),AMD64)
	OSFLAG += -D AMD64
	endif

	import Data.List
	import Data.Ord

	-- Tower of Hanoi implementation
	type Peg = String
	type Move = (Peg, Peg)
	hanoi :: Integer -> Peg -> Peg -> Peg -> [Move]
	hanoi 0 a b c = [ ]
	hanoi n a b c = hanoi (n-1) a c b ++ [(a,b)] ++ hanoi (n-1) c b a

	SHELL := /bin/bash

	REV := $(shell git rev-parse HEAD)
	CHANGES := $(shell test -n "$$(git status --porcelain)" && echo '+CHANGES' \|\| true)

	TARGET := packer-provisioner-itamae-local
	VERSION := $(shell cat VERSION)

	OS := darwin freebsd linux openbsd
	ARCH := 386 amd64

	"""Simple example on how to log scalars and images to tensorboard without tensor ops.

	License: BSD License 2.0
	"""
	__author__ = "Michael Gygli"

	import tensorflow as tf
	from StringIO import StringIO
	import matplotlib.pyplot as plt
	import numpy as np

	#!/usr/lib/python
	# -- coding: utf-8 --
	#
	# This is a re-implementation of Python's timsort in Python
	# itself. This is purely for learning purposes. :)
	# References: [
	# https://en.wikipedia.org/wiki/Timsort,
	# http://wiki.c2.com/?TimSort
	# ]
	#