Heechul Ryu ryuheechul

Working with ansible-vault

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

There are certain files created by particular editors, IDEs, operating systems, etc., that do not belong in a repository. But adding system-specific files to the repo's .gitignore is considered a poor practice. This file should only exclude files and directories that are a part of the package that should not be versioned (such as the node_modules directory) as well as files that are generated (and regenerated) as artifacts of a build process.

All other files should be in your own global gitignore file:

Create a file called .gitignore in your home directory and add any filepath patterns you want to ignore.
Tell git where your global gitignore file is.

Note: The specific name and path you choose aren't important as long as you configure git to find it, as shown below. You could substitute .config/git/ignore for .gitignore in your home directory, if you prefer.

File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.

For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.

This gives an ongoing list of file-type magic numbers.

	/*
	* Copyright 2014 Chris Banes
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	#!/bin/bash

	# Author: Erik Kristensen
	# Email: [email protected]
	# License: MIT
	# Nagios Usage: check_nrpe!check_docker_container!_container_id_
	# Usage: ./check_docker_container.sh _container_id_
	#
	# Depending on your docker configuration, root might be required. If your nrpe user has rights
	# to talk to the docker daemon, then root is not required. This is why root privileges are not

	import android.graphics.*;
	import com.squareup.picasso.Transformation;

	/**
	* Transforms an image into a circle representation. Such as a avatar.
	*/
	public class CircularTransformation implements Transformation
	{
	int radius = 10;

	var mandrillApiKey;
	var path = 'https://mandrillapp.com/api/1.0/messages/';

	exports.initialize = function(apiKey) {
	mandrillApiKey = apiKey;
	};

	exports.sendMail = function(params, options){
	callMandrill('send.json', params, options);
	};

	ActiveAdmin.register Product do

	permit_params :name, :category_id, :description, :text, :slug, :in_slider, :tag_ids => []

	filter :category
	filter :base_tags
	filter :name
	filter :text
	filter :created_at
	filter :updated_at

Heechul Ryu ryuheechul

Working with ansible-vault

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

File Magic Numbers

Image Files