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IP Tables (iptables) Cheat Sheet

IPTables is the Firewall service that is available in a lot of different Linux Distributions. While modifiying it might seem daunting at first, this Cheat Sheet should be able to show you just how easy it is to use and how quickly you can be on your way mucking around with your firewall.

Resources

The following list is a great set of documentation for iptables. I used them to compile this documentation.

How-To Geek: The Beginner’s Guide to iptables, the Linux Firewall: https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/
IPTables Essentials: Common Firewall Rules and COmmands https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands

Installing Arch Linux with Full Disk Encryption

If you're aiming for a seamless Arch Linux installation in UEFI mode, follow along as this guide will walk you through the process step by step. We'll be using LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) partitions on LUKS to achieve full disk encryption.

Note: I have updated this doc for UEFI mode. For those with BIOS/MBR systems, you can refer to the previous version, but keep in mind that it might be outdated and no longer accurate.

If you're only interested in installing Linux and not setting up dual boot with Windows, feel free to skip the Windows-related sections.

Use Case: I need to add some new requirements.

Create a new branch and add all of my requirements
Make a pull request to master
All of the new requirements are easily shown in the gitlab pull request
Reviewers would add their comments in gitlab to specific lines.
Developers would be able to comment back and forth in the comment section of the pull request and then make fixes
Reviewers can then verify once a fix has been made (Add a new comment to the line saying it is fixed?)
All changes have been accepted so the branch is merged into master

How to disable cloud-init in Ubuntu

apt-get  --assume-yes  --purge  remove  ubuntu-advantage-tools

So you want to write a sync system for a web app with offline and realtime support? Good luck. You might find the following resources useful.

Overview articles

Database in a browser, a spec (Stepan Parunashvili)

What problem are we trying to solve with a sync system?
The web of tomorrow (Nikita Prokopov)

	{ ... }:
	{
	virtualisation.arion.projects.nvidia-test.settings.services.nvidia-test = {
	service = {
	image = "nvidia/cuda:12.2.0-base-ubuntu20.04";
	command = "nvidia-smi";
	};
	out.service = {
	deploy.resources.reservations.devices = [
	{

	#!/usr/bin/perl

	##
	## This script converts an IPS crash report (.ips) to the legacy crash report format.
	##
	## The .ips file (JSON) is read from STDIN and the legacy crash report is written to
	## STDOUT.
	##

	use strict;

	# _____ _ _____ _ _
	# \| _ \|_ _\| \|_ ___\| \| \|_\|___
	# \| \| \| \| _\| . \| --\| \| \| . \|
	# \|__\|__\|___\|_\| \|___\|_____\|_\|_\| _\|
	# \|_\|
	#
	# By Abhishta (github.com/abhishtagatya)

	# pip install gTTs
	# pip install moviepy

	namespace CreateCert
	{
	using System;
	using System.Collections.Generic;
	using System.Security.Cryptography.X509Certificates;
	using System.Threading.Tasks;

	class Certificate
	{
	public static async Task<X509Certificate2> Create(string subject, string friendlyName, IEnumerable<string> alternativeNames)

	// when you're trying to use `position:sticky` on an element
	// you'll have trouble if any parent/ancestor element has
	// overflow set to anything other than "visible" (such as: auto,hidden,overlay,scroll)
	// & turns out if a parent is `display:flex` it might need some love
	// (to remedy this you can set the `align-self` of your sticky element)
	// see here for how the display & align-self properties affect: http://bit.ly/2ZaRu4o

	// so, to find those troublesome parents...
	// copy & paste this into Chrome Inspector/Dev Tools console
	// (and be sure to change the #stickyElement below, if needed)