Denis Albuquerque zidenis

Reading list to prepare for OCI Architect Associate Certificate Exam [1Z0-1072-21].

Step-by-step guide to configure Proxmox Web GUI/API with Let’s Encrypt certificate and automatic validation using the ACME protocol in DNS alias mode with DNS TXT validation redirection to Duck DNS.

Objective

We want to use a certificate in Proxmox GUI/API issued for free by a Certificate Authority trusted by default in browsers and operating systems. The chosen Certificate Authority will be Let's Encrypt [1]. Since the issued certificates are valid for only 90 days, automating the certificate renewal process is crucial. For this purpose, the Automatic Certificate Management Environment (ACME, RFC8555) protocol will be used [2].

	import 'package:shelf/shelf.dart';
	import 'package:shelf/shelf_io.dart' as io;

	void main() {
	serverWithLogging();
	}

	Response echoHandler(Request request) {
	return new Response.ok('echo: ${request.requestedUri}');
	}

	// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	part of dart.core;

	/**
	* The reserved word [:null:] denotes an object that is the sole instance of
	* this class.
	*

	int variavelA = null;
	String variavelB;
	if (variavelA == variavelB)
	print("Dart inicializa toda nova variável alocada para null");

	// As funções whatLangA, whatLangB e whatLangC implementam a mesma funcionalidade.
	var language = "Dart";

	whatLangA() => language ?? "not Dart";
	whatLangB() => language == null ? "not Dart" : language;
	whatLangC() {
	if (language==null) return "not Dart";
	else return language;
	}

	var languageA = "Dart";
	var languageB = null;
	languageA ??= "not Dart";
	languageB ??= "not Dart";
	print(languageA); // "Dart"
	print(languageB); // "not Dart"

	List<String> lst;
	lst?.add("Java");
	lst = [];
	lst?.add("Dart");
	lst?.add("C");
	print(lst); // [Dart, C]

	void main() {
	String s = "Dart";
	print(s is String); // true
	print(s.runtimeType); // String

	Dart d = new Dart();
	NotDart nd = new NotDart();
	print(d is Dart); // true
	print(nd is Dart); // false
	print(nd is NotDart); // true

	void main() {
	var prettyFunc = new PrettyPrint();
	print(prettyFunc is Function); // true
	prettyFunc.call("A", "Dart is cool", "B"); // A Dart is cool B
	prettyFunc("C", "Dart is cool", "D"); // C Dart is cool D

	var args = ["E", "Dart is cool", "F"]; // E Dart is cool F
	Function.apply(prettyFunc, args);
	}