sourav sarkar amsourav

Learn Go in ~5mins

This is inspired by A half-hour to learn Rust and Zig in 30 minutes.

Basics

Your first Go program as a classical "Hello World" is pretty simple:

First we create a workspace for our project:

A collection of The Morning Paper posts relating to containers, operating systems etc.

In order of first appearance in The Morning Paper.

The information below was written in Oct 2017. In August 2019 AWS launched official support for multiple target groups per AWS ECS service. Please use that feature instead!

Unfortunately as of writing this (Oct 18, 2017) there is no built in integration for multiple target groups per AWS ECS service. Here are a few things you can try:

If your application just serves port 80 (HTTP) & port 443 (HTTPS) then you should consider using the application load balancer and terminating SSL at the load balancer. This will allow your application to function using just port 80.

This is a proposal for ReactiveConf 2017 open call for Lightning talks. If you'd like to make this talk happen, please 🌟 this gist and retweet my tweet. 🙏

If you're on your phone, please request the 🖥 desktop site to star this gist 😇

I would talk about some myths on Jest & Enzyme. Moreover to stop the comparison of Jest and Enzyme. Instead would focus on how they can work together to test well your React Components. The talk would focus on "How Jest and Enzyme complement each other" and can help you test React components in a better way.

If you are writing tests: you are already winning.
If you are not writing tests:let me encourage you to start.
Jest.
Snapshot Testing.

Configuring AWS ECS to have access to AWS EFS

If you would like to persist data from your ECS containers, i.e. hosting databases like MySQL or MongoDB with Docker, you need to ensure that you can mount the data directory of the database in the container to volume that's not going to dissappear when your container or worse yet, the EC2 instance that hosts your containers, is restarted or scaled up or down for any reason.

Don't know how to create your own AWS ECS Cluster? Go here!

New Cluster

Sadly the EC2 provisioning process doesn't allow you to configure EFS during the initial config. After your create your cluster, follow the guide below.

New Task Definition for Web App

If you're using an Alpine-based Node server like duluca/minimal-node-web-server follow this guide:

Shallow

Real unit test (isolation, no children render)

Simple shallow

Calls:

constructor
render

	// a code snippet living in a component
	// source: https://stackoverflow.com/a/59843241/3600510
	const usePrevious = (value, initialValue) => {
	const ref = useRef(initialValue);
	useEffect(() => {
	ref.current = value;
	});
	return ref.current;
	};
	const useEffectDebugger = (effectHook, dependencies, dependencyNames = []) => {

	/*
	Copy this into the console of any web page that is interactive and doesn't
	do hard reloads. You will hear your DOM changes as different pitches of
	audio.

	I have found this interesting for debugging, but also fun to hear web pages
	render like UIs do in movies.
	*/

	const audioCtx = new (window.AudioContext \|\| window.webkitAudioContext)()

	#!groovy

	// https://medium.com/rocket-travel-engineering/running-advanced-git-commands-in-a-declarative-multibranch-jenkinsfile-e82b075dbc53
	// Jenkins only checks out the branch for performance reasons so to be able to do more advanced git commands we need to
	// also fetch master (or anything else you need)
	pipeline {
	agent any
	stages {
	stage ("info") {
	when {