ktpm489

System Design Cheatsheet

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

Basic Steps

1. 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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Docker Resources All In One

A collection of docker online resources. Source

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//app.js Socket IO Test
var app = require('express').createServer(),
    redis = require('socket.io/node_modules/redis'),
    io = require('socket.io').listen(app);

var pub = redis.createClient(port, "url");
var sub = redis.createClient(port, "url");
var store = redis.createClient(port, "url");
pub.auth('pass', function(){console.log("adentro! pub")});
sub.auth('pass', function(){console.log("adentro! sub")});

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#You should do all your LAMP development in a Virtual Machine

##Here's Why:

Many of us develop on Macintoshes. There are many reasons for this, but one of them is that it's based on a Unix platform of some sort. This allows us to run common server software such as Apache, Ruby, Python and Nodejs on our Macs.

Our computers become powerful develoment machines similar to the servers our apps will eventually live on.

Sometime we start our computer only to find Apache won't start, or MySQL can't create a PID file, or we've updated to Mountain Lion and Apache needs to be reconfigured. Death!

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#!/usr/bin/env bash

# A basic Self Signed SSL Certificate utility
# by Andrea Giammarchi @WebReflection

# https://www.webreflection.co.uk/blog/2015/08/08/bringing-ssl-to-your-private-network

# # to make it executable and use it
# $ chmod +x certificate
# $ ./certificate # to read the how-to

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# Reference:
https://www.cloudgear.net/blog/2015/5-minutes-kubernetes-setup/

# install homebrew and cask
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# install virtualbox
brew cask install virtualbox

# install dockertoolbox

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# As root user
sudo su

# Update the OS
sudo apt-get update -y

# Add this to ~/.bashrc to remove timezone warnings
echo 'export LC_ALL="en_US.UTF-8"' >> ~/.bashrc
source ~/.bashrc

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

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Clustering: The basics

The trick? pass the file descriptor from a parent process and have the server.listen reuse that descriptor. So multiprocess in their own memory space (but with ENV shared usually)

It does not balance, it leaves it to the kernel.

In the last nodejs > 0.8 there is a cluster module (functional although marked experimental)

• http://nodejs.org/api/cluster.html
• Simple cluster example:

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def jvmRunFlags = '''
-Xmx700m
- ...
'''.split().toList()

def jvmTestFlags = '''
-Dlocally=true
-ea
- ...
'''.split().toList()