paitonic

Rocky Linux 9 | Web Application Server Installation

Notice

This cheatsheet assumes the user is knowledgeable about bare installations of virtual private servers on cloud providers and is looking for quick but comprehensive instructions.

Some trivial commands might be missed or skipped.
However, this document can also work as quick tutorial for newcomers to the RHEL eco-system.

Initial System Setup

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)

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

Conventions

A = [xA, yA] is a point on the 2D plane. Same for B, C, ...
lengths are in any unit (ex: pixels)
code snippets are in JavaScript

Degrees to radians

angleRad = angleDeg * Math.PI / 180;

Regular Event Loop

This shows the execution order given JavaScript's Call Stack, Event Loop, and any asynchronous APIs provided in the JS execution environment (in this example; Web APIs in a Browser environment)

Given the code

	"""
	Example of using sub-parser, sub-commands and sub-sub-commands :-)
	"""

	import argparse


	def main(args):
	"""
	Just do something

	// EmailInput wraps an HTML `input` and adds some app-specific styling.
	const EmailInput = React.forwardRef((props, ref) => (
	<input ref={ref} {...props} type="email" className="AppEmailInput" />
	));

	class App extends Component {
	emailRef = React.createRef();

	render() {
	return (

	#!/bin/bash
	sudo apt-get install apt-transport-https ca-certificates -y
	sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
	sudo rm -f /etc/apt/sources.list.d/docker.list
	sudo add-apt-repository \
	"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
	$(lsb_release -u -cs) \
	stable"
	sudo apt-get update
	sudo apt-get purge lxc-docker

	module Main exposing (..)

	import Html exposing (Html, div, hr, text)
	import Html.App as App
	import Navigation


	-- APP IMPORTS

	import FirstPage