Alex Atkinson AlexAtkinson

CORS -- Just the edge knowledge

localhost

To set cookies on the localhost, either have a self signed cert setup (see refs), or exclude the 'secure', and 'sameSite' directives.

CORS

Be aware of:
forbidden headers

BASH

Brace Expansion

🗒️ +(...) is part of extended globs, you need to enable them explicitly with shopt -s extglob

🗒️ expansions support glob -NOT- regex

https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Shell-Expansions https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Pattern-Matching

Domain Names, DNS, and URLs for DevOps & Friends

Table of Contents

Evernote Alternative - Obsidian

This is my free Evernote alternative.

Tech Stack

There are three components of this solution: the note taking app, cloud-sync utility, and the optional cloud storage.

NOTE: If you don't need more than 2GB of cloud storage, you can get away with simply putting the vault in Dropbox and accessing from all your devices. NO NEED FOR SYNCTHING. Otherwise, read on.

The Nines

Availability is measured in nines. Here's the breakdown:

Availability %	Downtime/Y	DownTime/Mo	Downtime/w	Downtime/d	Class
55.5555555% ("nine fives")	162.33 d	13.53 d	74.92 h	10.67 h
90% ("one nine")	36.53 d	73.05 h	16.80 h	2.40 h	1
95% ("one nine five")	18.26 d	36.53 h	8.40 h	1.20 h
97%	10.96 d	21.92 h	5.04 h	43.20 m

Introduction

This is not a reprint of the docs, but a collection of tips, tricks, and specific guidance for my own reference, and the development of others.

Using

Interactive Container

So long as your container has a CLI, you can access it by specifying 'interactive' and 'tty' (pseudo-tty).

	#!/usr/bin/env bash
	# ----------------------------------------------------------------------------------------------------------------------
	#
	# make-ca-cert.sh
	#
	# SYNOPSIS
	# Creates a CA if one doesn't already exist, and installs it (debian).
	# Creats a server certificate (including wildcard SAN) signed by the CA.
	#
	# ----------------------------------------------------------------------------------------------------------------------

	# ----------------------------------------------------------------------
	# File: check_failover_dhcp.ps1
	# Description: NRPE Nagios Check for Windows Server 2012 DHCP Failover Servers
	# https://exchange.nagios.org/directory/Plugins/Network-Protocols/DHCP-and-BOOTP/Windows-2012-DHCP-Failover-and-Scope-Health-Check/details
	#
	# Checks: Failover State
	# Failover Mode
	# Scope State of Each Scope
	# Scope Statistics (PercentInUse) of Each Scope
	#

	#!/usr/bin/env bash
	# file_watch.sh
	# ------------------------------------------------------------------------------
	# Description:
	# Watches a file for changes.
	# Includes output on inode changes as that may be desirable in some scenarios.
	# NOTE: ... Just use inotifywait.
	#
	# Usage:
	# ./file_watch <path/to/file>

	#!/bin/env bash
	# Checks if subdomain.$1 is registered.
	# Iterates the 1000 most popular subdomains.
	# NOTE: Can be changed to 10000, or even 100000.
	#
	# Usage:
	# ./dnsSUBflyover.sh nike.com
	#
	# NOTE:
	# For more subdomains: