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1. install cloudflare_module

https://support.cloudflare.com/hc/en-us/articles/203656534-How-do-I-restore-original-visitor-IP-with-Apache-2-4-

mirght need to change sudo yum install httpd-devel libtool git with sudo yum install httpd24-devel libtool git

2. put the config file to /etc/httpd/conf.d/cloudflare.conf

CloudFlareRemoteIPHeader X-Forwarded-For

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

vovanmix

#SSH Inbound

SSH			TCP			22			0.0.0.0/0

Outbound

All traffic			All			All			0.0.0.0/0

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#It's better to terminate SSL session on ELB level and make ELB - WS communication a plain HTTP

#set up http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/SSL-on-an-instance.html

sudo yum install -y mod24_ssl

By default it sets up self-signed certificate.

#EC2 LB

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#! /usr/bin/env python

import redis
import random
import pylibmc
import sys

r = redis.Redis(host = 'localhost', port = 6389)
mc = pylibmc.Client(['localhost:11222'])

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Style Guide for Python Code - https://www.python.org/dev/peps/pep-0008/

Python style guide checkers - pep8, flake8

Access an item in a dict that is not available. The dict returns a new object using the function you passed as argument to the constructor

#long:
somedict = {}
if somekey not in somedict:
  somedict[somekey] = []

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#Auto Scaling ##1. Have a config (ex. .env) file in a private S3 ##2. Create a reference instance ##3. Install AWS cli app to the server ##4. Create a shell script to download config file ##5. Create an image with all stack software installed, with shell script in place Write bash scripts in the AMI creating interface to automatically bootstrap the instance on create

#Code Deploy configuration ##Create an App

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/**
 * Functor takes a value and a function, splits the value, feeds the value to the function and returns the result
 * Examples: .map(), .filter()
 */
function F(value, fn){
  return fn(value);
}

F(1, plus1); //2

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We create a separate port listener in web server config, forwart all HTTP connections from load balancer to this port, and configure web server to redirect all connections on this port to https

#add port 1443 listener to EC2 security group

Custom TCP Rule   TCP   1443  <load balancer group id>

#add load balancer rules:

HTTP 80 HTTP 1443 N/A N/A

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##like rspec http://www.phpspec.net/en/latest/manual/getting-started.html

##mock interfaces https://github.com/atoum/atoum

##describe it, monkey patching https://github.com/crysalead/kahlan

functional tests