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

Modernization/Dockerization Hazards Enablement

Despite Digital Transformation and application modernization being well established practices, there are always unforeseen issues the creep up. This exceedingly truncated list of hazards will hopefully help identify some issues early.

💡 This is a companion to -- not a replacement for -- the decadeds of retrospective material that exists on the subject. While it's advisable to engage an outside consultancy if you're unfamiliar with the topic, tackling this list early can offset those costs as their runbook will contain similar content as they assess your application.

Resources

Here are a few vids that give more context to this issue.

Domain Names, DNS, and URLs for DevOps & Friends

Table of Contents

Project Management & Governance Readiness

Project Management can be as simple or as complex as needed. If your project is you and a few highly-aligned folks in the same room then you might be able to make do with a whiteboard and some sticky-notes, but this doesn't scale. There's a lot of expertise involved in taking a project from sticky-notes to a scaled agile enterprise operating model, but the foundations of planning don't change. IE: If you want to dig for treasure, then you should plan to get a shovel to enable your success.

This primer is most useful for founders, PMs, and engineering leaders moving from early execution into repeatable delivery.

Aside: Discover Your Minimum Viable Operating Posture

Before you jump into executing your vision, start by discovering your minimum viable operating posture (see also the concept of minimum virtuous products), as this dictates a large portion of your overall organizational s

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.

Docker Compose

Build/Install

Build/Install from the Docker Compose Github Releases, as the version available in your operating system's package manager is likely dated, and this component recieves frequent bugfixes.

	# ----------------------------------------------------------------------
	# 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>