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I ran into the battle of running all of my VMs and the host node under a single public IP address. Luckily, the host is just pure Debian, and ships with iptables.

What needs to be done is essentially to run all the VMs on a private internal network. Outbound internet access is done via NAT. Inbound access is via port forwarding.

Network configuration

Here’s how it’s done:

Create a virtual interface that serves as the gateway for your VMs:

Optimizing postgresql table for more than 100K inserts per second

Create UNLOGGED table. This reduces the amount of data written to persistent storage by up to 2x.
Set WITH (autovacuum_enabled=false) on the table. This saves CPU time and IO bandwidth on useless vacuuming of the table (since we never DELETE or UPDATE the table).
Insert rows with COPY FROM STDIN. This is the fastest possible approach to insert rows into table.
Minimize the number of indexes in the table, since they slow down inserts. Usually an index on time timestamp with time zone is enough.
Add synchronous_commit = off to postgresql.conf.
Use table inheritance for fast removal of old data:

	<?php

	class Funcao
	{
	public static function remover_acento($texto)
	{
	$caracteres = array(
	'Š'=>'S', 'š'=>'s', 'Ð'=>'Dj','Â'=>'Z', 'Â'=>'z', 'À'=>'A', 'Á'=>'A', 'Â'=>'A', 'Ã'=>'A', 'Ä'=>'A',
	'Å'=>'A', 'Æ'=>'A', 'Ç'=>'C', 'È'=>'E', 'É'=>'E', 'Ê'=>'E', 'Ë'=>'E', 'Ì'=>'I', 'Í'=>'I', 'Î'=>'I',
	'Ï'=>'I', 'Ñ'=>'N', 'Å'=>'N', 'Ò'=>'O', 'Ó'=>'O', 'Ô'=>'O', 'Õ'=>'O', 'Ö'=>'O', 'Ø'=>'O', 'Ù'=>'U', 'Ú'=>'U',

	# Kernel sysctl configuration file for Linux
	#
	# Version 1.14 - 2019-04-05
	# Michiel Klaver - IT Professional
	# http://klaver.it/linux/ for the latest version - http://klaver.it/bsd/ for a BSD variant
	#
	# This file should be saved as /etc/sysctl.conf and can be activated using the command:
	# sysctl -e -p /etc/sysctl.conf
	#
	# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and sysctl.conf(5) for more details.

	<?php

	TTransaction::open(self::$database);

	$vendas = Venda::where('cliente_id','=', $cliente_id)->load();

	$lista_vendas = array();

	foreach ($vendas as $venda) {
	array_push($lista_vendas, $venda->toArray());

	<?php

	$cep = str_replace(['.','-'], ['',''], $cep);

	$cpf = str_replace(['.','-'], ['',''], $cpf);

	$cnpj = str_replace(['.','/','-'], ['','',''], $cnpj);

	$celular = str_replace(['(',')','-',' '], ['','','',''], $celular);

	<?php

	TScript::create( "
	setInterval(function () {
	Adianti.waitMessage = 'Carregando';
	__adianti_post_data('form_PedidosList', 'class=PedidosList&method=onReload');
	return false;
	}, 10000); // 10000 milliseconds => 10 segundos
	");

	<?php

	use PHPMailer\PHPMailer\PHPMailer;
	use PHPMailer\PHPMailer\Exception;

	/* SMTP - CONEXÃO
	587 > TLS
	465 > SSL

	G-MAIL:

	你长的怪像人殊不知是只人面犬
	你的脸有碍观瞻
	当初惊艳,完完全全,只为世面见得少。
	嫉妒是一种不好的情感，我理解你嫉妒我有家人，可你这么说有点过分了
	你自拍一张就是你的全家福
	远看是美景，近看想报警
	你在无中生有你在暗度陈仓你在凭空想象你在凭空捏造你在无言无语你在无可救药你是逝者安息你是一路走好你是傻子巴拉你是永无止境你是没钱买药你是头脑有病你是眼里有泡你是嘴里刘能你是污言秽语你是咎由自取你是殃及无辜你是祸害众生你是仓皇失措你是暗度陈仓你是无可救药
	胖姑娘袭花衫，花都胖起来。
	即使是做咸鱼，也要做最咸的那一条。

	<?php

	class VendaGraficoBarChart extends TPage
	{
	private $form;
	private $loaded;
	private static $database = 'exemplos';
	private static $activeRecord = 'VendaGrafico';
	private static $primaryKey = 'id';
	private static $formName = 'form_VendaGrafico';