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Claude Code no VPS + Hardening do zero (ou quase)

Roteiro para configurar um VPS Ubuntu 24.04 a partir do root até um ambiente endurecido com usuário não-root, SSH key-only, fail2ban, UFW e diretório de deploy pronto.

Otávio aqui: isso foi 99% escrito pelo Claude usando meu DEV_GUIDE de outros vídeos.

Pré-requisitos

5 Steps for Creating Templates and Virtual Machines on Proxmox using Linux Distro's Cloud Images

This tutorial guides you through the process of creating Templates and Virtual Machines on Proxmox using cloud-based images from various Linux distributions. We provide clear instructions for Alma Linux 9, Amazon Linux 2, CentOS 9, Fedora 38, Oracle Linux 9, RHEL 9, Rocky Linux 9, and Ubuntu 23.04 Lynx Lobster.

Note: The instructions have been tested on Proxmox 8.0.4.

Let's begin by choosing the cloud-based image. If you already have your preferred Linux distribution, skip to the 1st step.

To assist in making informed choices when selecting a Linux distribution for your virtual machines, we've compiled a table showcasing key characteristics of each cloud image. This table provides a snapshot of important attributes, including kernel version, Python version, number of processes initialized after boot, number of packages installed, free memory after boot, VM disk size, root partition disk size, used size on t

OOP in Bash script

Wait, what?

Inspired by this awesome article.

Prelude about OOP

According to wikipedia, OOP is a programming paradigm or technique based on the concept of "objects". The object structure contain data and behaviour.

Data is the object's state, which should be isolated and must be private.

Slides

https://speakerdeck.com/dianaarnos/php-alem-do-sincrono

Exemplos de código

https://github.com/dianaarnos/php-alem-do-sincrono curl_multi speed for PHP - https://gist.github.com/bmatheny/991247
Guzzle e o uso de curl_multi - https://github.com/guzzle/guzzle/blob/a3a20779541ca1ae73d0d3766a83c33d14468f9e/src/Handler/CurlMultiHandler.php

Assíncrono

Coroutines - O que são corrotinas? | Dias de Dev - https://www.youtube.com/watch?v=Nbt0eQHChoI

Apresentação

Slides
Meli Tech Day (Privado Mercado Livre)
- Gravação
- Detalhes no site do Meli Tech Day
SyncTech (Privado Mercado Livre)
Gravação

	#!/bin/bash

	# Check if running as root
	if [[ $EUID -ne 0 ]]; then
	echo "Error: This script must be run as root. Use sudo."
	exit 1
	fi

	# Initial settings
	set -euo pipefail

	# I'll be doing another one for Linux, but this one will give you
	# a pop up notification and sound alert (using the built-in sounds for macOS)

	# Requires https://github.com/caarlos0/timer to be installed

	# Mac setup for pomo
	alias work="timer 60m && terminal-notifier -message 'Pomodoro'\
	-title 'Work Timer is up! Take a Break 😊'\
	-appIcon '~/Pictures/pumpkin.png'\
	-sound Crystal"

	// not iterable
	{
	const myItem = {
	a: 1,
	b: 2
	}
	// const r = [...myItem] // TypeError: myItem is not iterable
	}

	// now object is iterable

	// npm i axios stream-concat
	import { pipeline } from 'stream/promises'
	import StreamConcat from 'stream-concat'

	import axios from 'axios'
	const API_01 = 'http://localhost:3000'
	const API_02 = 'http://localhost:4000'

	const streams = (await Promise.all([
	axios({

	// paste this file on a empty directory
	// npm i axios

	// You should go to your browser on Cookie session and get JSESSIONID and li_at from Linkedin Section
	const JSESSIONID = 'YOUR JSESSIONID'
	const liAT = 'YOUR li_at'

	import axios from 'axios'

	const headers = {