Mbitz Mbitzg

Dual-boot Mac OS X (FileVault2) and Ubuntu (OpenZFS/LUKS)

This procedure results in a computer that runs both Mac OS X and Ubuntu in a dual-boot configuration, each operating system using full (whole) disk encryption, and with the Ubuntu root file system stored on a ZFS pool encrypted using LUKS. The specific hardware and software versions used to document this procedure are:

MacBookPro8,2

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.

Easy parallel python with concurrent.futures

As of version 3.3, python includes the very promising concurrent.futures module, with elegant context managers for running tasks concurrently. Thanks to the simple and consistent interface you can use both threads and processes with minimal effort.

For most CPU bound tasks - anything that is heavy number crunching - you want your program to use all the CPUs in your PC. The simplest way to get a CPU bound task to run in parallel is to use the ProcessPoolExecutor, which will create enough sub-processes to keep all your CPUs busy.

We use the context manager thusly:

with concurrent.futures.ProcessPoolExecutor() as executor:

MySQL

Getting started: http://www.sqlteaching.com/

Related tutorial: http://cd64.de/mysql-cli

SQL joins infografic: http://cd64.de/sql-joins

Linux Backup Solutions

I've been looking for the best Linux backup system, and also reading lots of HN comments.

Instead of putting pros and cons of every backup system I'll just list some deal-breakers which would disqualify them.

Also I would like that you, the HN community, would add more deal breakers for these or other backup systems if you know some more and at the same time, if you have data to disprove some of the deal-breakers listed here (benchmarks, info about something being true for older releases but is fixed on newer releases), please share it so that I can edit this list accordingly.

Amanda (comments by sammcj)

It has a lot of management overhead and that's a problem if you don't have time for a full time backup administrator.

	# Automatically instal the latest nginx
	wget -O - http://nginx.org/keys/nginx_signing.key \| sudo apt-key add -

	#Make a backup copy of your current sources.list file
	sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

	#Now copy the following repositories to the end of ` /etc/apt/sources.list`
	echo "deb http://nginx.org/packages/mainline/ubuntu/ trusty nginx" \| sudo tee -a /etc/apt/sources.list
	echo "deb-src http://nginx.org/packages/mainline/ubuntu/ trusty nginx" \| sudo tee -a /etc/apt/sources.list

	##ref: https://raw.githubusercontent.com/docker/docker-registry/master/contrib/apache.conf

	<VirtualHost *:443>
	ServerName registry.example.com
	ServerAlias www.registry.example.com

	SSLEngine on
	SSLCertificateFile /etc/apache2/ssl/registry.example.com.crt
	SSLCertificateKeyFile /etc/apache2/ssl/registry.example.com.key

	# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
	# This is how I upload my new Sol Trader builds (http://soltrader.net)
	# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash

	S3KEY="my aws key"
	S3SECRET="my aws secret" # pass these in

	function putS3
	{
	path=$1