davecan

Toc

Keyboard shortcuts

The IPython Notebook has two different keyboard input modes. Edit mode allows you to type code/text into a cell and is indicated by a green cell border. Command mode binds the keyboard to notebook level actions and is indicated by a grey cell border.

MacOS modifier keys:

• ⌘ : Command

davecan

Summary

(research articles with TLDRs are at the end of this document)

Vitamin D

• Get at least 30 minutes of summer sun (or "equivalent") each day, without sunscreen**, to allow the body to produce proper levels of Vitamin D and other chemicals (nitric oxide/etc) naturally.
• If must supplement, get at least 5,000 IU/day, combine with K2 to prevent calcium accumulation in the blood, and consume with a fat to ensure proper absorption.
• Target: 50-75ng/ml blood level.
• We don't need to worry much about overdosing on D3
• No LD50 (median lethal dose) has been calculated for humans but researchers use dog values as estimates, which means we would need to take 3,500 50,000IU capsules within 24 hours to have a 50% chance of dying.

davecan

REST & Spring Boot concepts

• https://martinfowler.com/articles/richardsonMaturityModel.html
  • The 3 levels of REST maturity - level 3 requires HATEOAS and is a prerequisite for proper REST
• https://spring.io/understanding/HATEOAS - explains HATEOAS simply
• http://www.springboottutorial.com/spring-boot-vs-spring-mvc-vs-spring - simple explanations

Sources

• Learning Pivotal Cloud Foundry for Web Developers

davecan

Watch this: https://www.youtube.com/watch?v=dIFKmJ4wufc

• Set up lab router -- simple $60 linksys router can work well enough -- run cable from the wifi router to the lab router
• All devices in the lab go behind the lab router
  • Otherwise can cause DNS/DHCP conflicts & general chaos across the rest of the home network
  • Isolate the lab behind this internal router to avoid conflicts
• Lab network must be on different subnet than the main home network
  • Because router is for routing between different subnets
  • So if labnet is on same subnet as homenet then router can't route properly
• If homenet is on NAT network space 192.168.1.x then router's external port must be on the same network, e.g. have IP such as 192.168.1.2

davecan

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

davecan

Super simple docker cheatsheet.

Build & deploy an app

First build the image:

docker build -t <desired_image_name> .

Example from when I built a container having a TCP/IP client script and TCP/IP server script, so I wanted a generic name:

davecan

// When using webpack under WSL Ubuntu the following error will be generated during "npm start":
//
//    Error: EINVAL: invalid argument, "index.css"  (or similar to this)
//
// This is apparently a bug in how Microsoft implemented the Ubuntu subsystem.
//
// The solution is to add the below code to the very top of the webpack config file. (above the imports is fine)
//
// See:  https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/440

davecan

After checking multiple tutorials I had to take pieces from each of the following to get this to work on my Win10 system:

• https://www.howtogeek.com/165268/how-to-add-open-powershell-here-to-the-context-menu-in-windows/
• https://www.tenforums.com/tutorials/60175-open-powershell-window-here-context-menu-add-windows-10-a.html

Basically it uses the steps from the first article, but under the background path from the second article. Neither article on its own worked for me.

Steps:

davecan

Intro

Every developer eventually faces the challenge of managing their personal "dotfiles" among the different machines he or she uses.

This post details how I tackled this issue by using Dropbox as a git remote while avoiding the pitfalls of storing the repository itself in Dropbox.

In the beginning

davecan

function GetDropboxPath
{
    $jsonPartialPath      = "\Dropbox\info.json"
    $jsonAppdataPath      = $env:APPDATA + $jsonPartialPath
    $jsonLocalAppdataPath = $env:LOCALAPPDATA + $jsonPartialPath

    if (test-path $jsonAppdataPath)
    {
        $jsonPath = $jsonAppdataPath
    }