ahmedalazazy

Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

Frontend Masters: AWS for Frontend Engineers

You should have the following completed on your computer before the workshop:

Install the AWS CLI.
Have Node.js installed on your system. (Recommended: Use nvm.)
- Install yarn with brew install yarn.
Create an AWS account. (This will require a valid credit card.)
Create a Travis CI account. (This should be as simple as logging in via GitHub).

Introduction

C-a == Ctrl-a
M-a == Alt-a

General

:q        close
:w        write/saves
:wa[!]    write/save all windows [force]
:wq       write/save and close

Find the original here article here: Devops Best Practices

DevOps started out as "Agile Systems Administration". In 2008, Andrew Shafer did a talk called "Agile Infrastucture" addressing issues around involving more of the company in the same disciplines as programmers.

In 2009, Patrick Debois created "DevOpsDays" conference to help to bring it to light. However, it wouldn't begin to trend until about 2010, when people would begin to describe it as a standalone discipline.

Today, DevOps goes beyond just developers, systems administration and infrastructure, its about [dev, ops, agile, cloud

How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

Virtual hosts

Let's say you want to host domains first.com and second.com.

Create folders for their files:

Laravel's Dependency Injection Container in Depth

Translations: Korean (by Yongwoo Lee)

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

How to set up DNS records on gandi.net to use a custom domain on Github Pages

You would think it would be easy to find this information, but none of the Github or Gandi documentation is clear so I have recorded the required steps here.

Create the following A records:

@ 1800 IN A 185.199.108.153
@ 1800 IN A 185.199.109.153
@ 1800 IN A 185.199.110.153

	cd /etc/yum.repos.d/
	sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
	sed -i 's\|#baseurl=http://mirror.centos.org\|baseurl=http://vault.centos.org\|g' /etc/yum.repos.d/CentOS-*
	dnf up -y

	# Reset
	Color_Off="\[\033[0m\]" # Text Reset

	# Regular Colors
	Black="\[\033[0;30m\]" # Black
	Red="\[\033[0;31m\]" # Red
	Green="\[\033[0;32m\]" # Green
	Yellow="\[\033[0;33m\]" # Yellow
	Blue="\[\033[0;34m\]" # Blue
	Purple="\[\033[0;35m\]" # Purple

	#!/bin/sh
	# chmod a+x software.sh

	# Install Brew
	/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

	brew tap homebrew/core
	brew tap homebrew/cask
	brew tap homebrew/cask-drivers