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Change MAC address in macOS Sequoia

I was unable to change the MAC address of the Wi-FI device on a MacBook Air (M1 2020) running macOS Sequoia due to the following error: ifconfig: ioctl (SIOCAIFADDR): Can't assign requested addres.

By running the commands in following sequence I was able to change it successfully:

Turn WiFi device off
Turn the WiFi device on again: networksetup -setairportpower en0 on
Change the MAC: ifconfig en0 ether <mac-address-here>
Run: networksetup -detectnewhardware

Never touch your local /etc/hosts file in OS X again

To setup your computer to work with *.test domains, e.g. project.test, awesome.test and so on, without having to add to your hosts file each time.

Requirements

Homebrew
Mountain Lion -> High Sierra

Install

Pessimistic Locking in Node.js with TypeORM

In this article, we will explore pessimistic locking, its main aspects, and how to implement it in Node.js using TypeORM. Pessimistic locking is a strategy to prevent concurrent access to a resource by obtaining exclusive access to the resource before making any changes. This approach ensures that other transactions cannot modify the locked resource until the lock is released.

We will use a practical example to demonstrate how to implement pessimistic locking in a Node.js application using the TypeORM library. Our example will focus on a payment processing scenario, where multiple processes might attempt to update the status of a payment concurrently.

To limit a CPU to a certain C-state, you can pass the processor.max_cstate=X option in the kernel line of /boot/grub/grub.conf.

Here we limit the system to only C-State 1:

    kernel /vmlinuz-2.6.18-371.1.2.el5 ... processor.max_cstate=1

On some systems, the kernel can override the BIOS setting, and the parameter intel_idle.max_cstate=0 may be required to ensure sleep states are not entered:

Introduction

Pi-Hole's primary function is to be a DNS server with the ability to block domains, usually used for advertising, tracking or other unwanted sites. It also features a built-in DHCP Server.

Usually, your router will also have a built-in DHCP server, pre-configured from factory, and for most users this is perfectly fine. But in some cases you may want to run another DHCP server instead of relying on your router's one. This guide will help you understand how a DHCP server works and how to configure it without disturbing your network.

If you already know the networking basics, you can cut to the chase and read just the configuration part

	#!/bin/sh
	#
	# Author: Riyad Preukschas <[email protected]>
	# License: Mozilla Public License 2.0
	# SPDX-License-Identifier: MPL-2.0
	#
	# OpenWRT firewall script for configuring NPTv6 (network prefix translation).
	#
	# # Installation
	#

	#!/usr/bin/env bash

	WALLPAPER_DIR="$(xdg-user-dir PICTURES)/Wallpaper"

	if [ ! -d "$WALLPAPER_DIR" ]; then
	echo "Wallpaper Directory not founded: $WALLPAPER_DIR"
	exit 1
	fi

	WALLPAPER_LIGHT=$(find "$WALLPAPER_DIR/Light" -type f \( -iname '.jpg' -o -iname '.png' -o -iname '*.jpeg' \) \| shuf -n 1)

	"""Used for rendering frames as png files."""

	import sys
	import os
	import numpy as np
	import pyvista as pv
	import nibabel as nb

	FILENAME = "/path/to/image3D.nii.gz"
	OUTDIR = "/path/to/output"

	from selenium import webdriver
	from selenium.webdriver.common.by import By
	from selenium.webdriver.support.ui import Select, WebDriverWait
	from selenium.webdriver.support import expected_conditions as EC
	from time import sleep, strftime

	def waituntil(s):
	while strftime('%H:%M:%S') < s:
	print strftime('%H:%M:%S')
	sleep(1)

	// This will use the single-packet attack for HTTP/2, and last-byte synchronisation for HTTP/1
	int NUMBER_OF_REQUESTS = 10;
	var reqs = new ArrayList<HttpRequest>();
	for (int i = 0; i < NUMBER_OF_REQUESTS; i++) {
	reqs.add(requestResponse.request());
	}

	var responses = api().http().sendRequests(reqs);
	var codes = responses.stream().map(HttpRequestResponse::response).filter(Objects::nonNull).map(HttpResponse::statusCode).toList();
	logging().logToOutput(codes);