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How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

IRC Reference

by xero updated 10.29.24

Por: Paulo Torrens
Originalmente portado no facebook em 2014-03-08

#["LÓGICA DE PROGRAMAÇÃO" É BOBAGEM, e explicarei porquê.]

Se preparem que o texto é longo.

Várias vezes chegam novatos aqui perguntando como começar, e a galera diz "estuda lógica primeiro, depois vai pra linguagem X". Vivo dizendo que é bobagem. Ontem, em particular, falei isso, e vieram várias pessoas por inbox me perguntar porquê (e uma pra me xingar, achando que falei por arrogância).

Pra facilitar, eu vou escrever uma boa explicação de porquê "lógica de programação" é furada, doa a quem doer, e postar na APDA e no fórum da EnergyLabs (para futuras referências, porque esse assunto vai voltar, ctz).

Let's Encrypt / Dovecot / Postfix / UFW firewall / Certbot

This tutorial describes how to install TLS to a mail server consisting of Postfix and/or Dovecot by using Let's Encrypt certificates with automatic renewing and firewall management.

The system used for this tutorial was:

$ lsb_release -idrc
Distributor ID: Ubuntu

Below is the procedure to automate the ip ban of tor exit nodes with fail2ban.

Install fail2ban:

sudo apt install fail2ban

Create a new fail2ban jail (editing /etc/fail2ban/jail.local):

[tor]


	0 = Success
	1 = Operation not permitted
	2 = No such file or directory
	3 = No such process
	4 = Interrupted system call
	5 = Input/output error
	6 = No such device or address
	7 = Argument list too long
	8 = Exec format error

	#!/usr/bin/env bash

	# this can be useful when developing against a custom DNS server, or
	# for example, if you made a change to the DNS settings of a domain, and you
	# know the authoritative nameserver IP address for a domain, you could use this
	# to bypass the intermediate DNS cache, and apply an HTTP request using the new
	# DNS settings supplied by your specified (authoritative) nameserver

	curl --dns-servers <DNSIP,DNSIP> url.com

	#!/bin/bash

	# Bash Script by https://gist.github.com/mitchellkrogza
	# ************************************************************
	# This script clears the log file and database of Fail2Ban
	# This resets Fail2Ban to a completely clean state
	# Useful to use after you have finished testing all your jails
	# and completed your initial setup of Fail2Ban and are now
	# putting the server into LIVE mode
	# ************************************************************

	/*
	Parts of this code is inspired from the following:
	[1] https://userstyles.org/styles/105000/smart-dark
	*/

	html {
	background-color: #222 !important;
	}

	body {