Prabir Shrestha prabirshrestha

PXE Boot Setup with GRUB2 Tutorial

There are many tutorials on the internet that tell you how to setup a PXE Boot server with PXELINUX. There are however other options to replace PXELINUX like GRUB2 and iPXE. In this tutorial, I'm going to teach you how to setup a PXE Boot Environment with GRUB2, and later add menu entries to boot many popular OSes.

Notice: I'm not going to repeat the part where you setup the DHCP and TFTP server. Such section in other tutorials still applies to this scenario.

Making the GRUB2 image to be loaded by NIC

think the GRUB2 image as the same as PXELINUX's pxelinux.0 file. Your DHCP server must point to it, and it must be available on your TFTP server. Instead of shoving a blob down your throat and telling you that it just works, I'm going to walk you through the process of making one yourself by using an readily available linux installation.

Setting up ZeroTier as a default ethernet interface

Step 1: Install ZeroTier

Install ZeroTier on your gateway, join your network and authorize it, and then configure it as a basic IPv4 NAT router

/etc/sysctl.conf

Windows SSH Server with Password-less Key Authentication and Default WSL2 Shell

Disclaimer: I am not a Windows Admin and I'm not even that good with PowerShell.

I wanted to be able to SSH into my Windows laptop directly into Linux. I also wanted to disable password authentication and only allow public key (RSA in my case) authentication.

Scott Hanselman wrote a blog post on how to make your default WSL2 distro your default shell for SSH. Windows OS Hub published an article on using public key

	#!/bin/sh

	# suggest.sh -- get suggestion keywords from several site
	#
	# Usage:
	# suggest SITE KEYWORDS...
	# SITE:
	# youtube(yt), archwiki(aw), duckduckgo(d), wikipedia(w), amazon(a)
	# Example:
	# suggest wikipedia Linux

	use bytes::{Buf, Bytes, BytesMut};
	use opentelemetry::sdk;
	use opentelemetry::sdk::propagation::TraceContextPropagator;
	use opentelemetry::sdk::trace::{Builder, Sampler};
	use opentelemetry::trace::TracerProvider;
	use opentelemetry::{global::set_text_map_propagator, KeyValue};
	use std::convert::TryFrom;
	use std::env::var;
	use std::net::SocketAddr;
	use std::process::Stdio;

	# Hybrid UEFI/BIOS multiboot USB drive

	# Install required packages
	sudo apt install gdisk grub2-common grub-efi-amd64-bin grub-pc-bin qemu-system

	# Create an empty disk image
	target_size=3.6G # $(lsblk -b --output SIZE -n -d /dev/sdX) for drive size
	qemu-img create -f raw boottitikku.img "$target_size"

	# Create a GUID Partition Table (GPT)

	sudo -i
	export DEV="/dev/sda"
	export DEV="/dev/nvme0n1"
	export DM="${DEV##*/}"
	export DEVP="${DEV}$( if [[ "$DEV" =~ "nvme" ]]; then echo "p"; fi )"
	export DM="${DM}$( if [[ "$DM" =~ "nvme" ]]; then echo "p"; fi )"
	# export SDD_PASS=secret123

	sgdisk --print $DEV
	sgdisk --zap-all $DEV

	# Instruction + template repo: https://github.com/FedericoPonzi/rust-ci
	# Search and replace <YOUR_BINARY_NAME> with your binary name.
	name: CI

	on:
	pull_request:
	push:
	branches:
	- master
	tags:

	ffmpeg -i "c:/videos/sample.mp4
	-map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0
	-c:v libx264 -crf 22 -c:a aac -ar 48000
	-filter:v:0 scale=w=480:h=360 -maxrate:v:0 600k -b:a:0 64k
	-filter:v:1 scale=w=640:h=480 -maxrate:v:1 900k -b:a:1 128k
	-filter:v:2 scale=w=1280:h=720 -maxrate:v:2 900k -b:a:2 128k
	-var_stream_map "v:0,a:0,name:360p v:1,a:1,name:480p v:2,a:2,name:720p"
	-preset slow -hls_list_size 0 -threads 0 -f hls -hls_playlist_type event -hls_time 3
	-hls_flags independent_segments -master_pl_name "name-pl.m3u8"
	"c:/videos/encoded/name-%v.m3u8"