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云

IaaS指提供系统（可以自己选）或者储存空间之类的硬件，软件要自己手动装；PaaS提供语言环境和框架（可以自己选）；SaaS只能使用开发好的软件（卖软件本身）；BaaS一般类似于非关系数据库，但各家不通用，有时还有一些其它东西。

其他人的集合

https://education.github.com/pack GitHub学生包，需用教育邮箱验证。各种福利，可从DigitalOcean上手
https://github.com/ripienaar/free-for-dev 本文尽量不与此项目重复
https://free.zhelper.net/
https://github.com/AchoArnold/discount-for-student-dev

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

Docker Hub 镜像加速器

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。Docker 官方和国内很多云服务商都提供了国内加速器服务。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

配置加速地址

Ubuntu 16.04+、Debian 8+、CentOS 7+

Commit Message Conventions

These rules are adopted from the AngularJS commit conventions.

Goals
Generating CHANGELOG.md
- Recognizing unimportant commits
- Provide more information when browsing the history
Format of the commit message
Subject line

Exploiting the Blob Cache in Minecraft: Bedrock Edition

...and why it matters.

Preface

You might have seen my HiveCorruptor plugin on Poggit. To be clear, I don't have a vendetta against The Hive or anything like that, the plugin was more so a comedic demonstration of how the blob cache can be exploited to crash clients. The next thing you're probably thinking is "how the hell does this work?" - and this is what this article will go over.

Introduction

Migrating a Rails project from MySQL to PostgreSQL

This brief guide is written from my own experience with migrating a large (~5GB) MySQL database to PostgreSQL for a Rails project.

No warranties, guarantees, support etc. Use at your own risk and, as always, ENSURE YOU MAKE BACKUPS FIRST!

I chose [pgloader][1] because it's extremely fast. YMMV.

Replace mysql2 gem with pg in Gemfile.
Update config/database.yml for PostgreSQL. I used [Rails' template][2] as a starting point.

	#!/bin/sh

	echo 'NOTE: You can now install cloudflared directly from Termux repos.'
	echo 'NOTE: To install it from source instead, open the script and comment out the next two lines.'
	pkg install cloudflared
	exit
	# ^ comment out these lines to proceed with the script

	echo "--upgrading packages"
	yes "" \| pkg update

	# This script will manually rip out all VMware Tools registry entries and files for Windows 2008-2019
	# Tested for 2019, 2016, and probably works on 2012 R2 after the 2016 fixes.

	# This function pulls out the common ID used for most of the VMware registry entries along with the ID
	# associated with the MSI for VMware Tools.
	function Get-VMwareToolsInstallerID {
	foreach ($item in $(Get-ChildItem Registry::HKEY_CLASSES_ROOT\Installer\Products)) {
	If ($item.GetValue('ProductName') -eq 'VMware Tools') {
	return @{
	reg_id = $item.PSChildName;

	/**
	* A PWM example for the ATmega328P using the 8-Bit Fast PWM mode.
	*/
	#include <avr/io.h>
	#include <avr/interrupt.h>
	#include <stdbool.h>
	#include <util/delay.h>

	int main (void) {