524c

kubectl delete "$(kubectl api-resources --namespaced=true --verbs=delete -o name | tr "\n" "," | sed -e 's/,$//')" --all

524c

Deploy K3s and Rancher on Raspberry Pi 4 cluster

Today I tried to setup a small Kubernetes cluster on top of 3 Raspberry Pi 4 (4GB Memory). Here is the steps to install the cluster.

Preparation

I have 3 Raspberry Pi 4 stacked with PoE headers and connected to a PoE switch at home. The are connected to Internet through a home router. All Pis are equipped with a 64GB Samsung SDXC card flushed with Ubuntu 20.04 image.

524c

How to install Ubuntu Server and Minikube on Raspberry Pi 4 4GB+ (recommended)

Disclaimer: this step-by-step GIST has been created with no guarantees, I may have missed some steps because of distraction or chiptune improvised on-chair-dancing, so be patient and let me know if I must add or fix something.

This is the way for living long and prospering!

Download Raspberry Pi Imager

Download and install Raspberry Imager: https://www.raspberrypi.org/software/

524c

// https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
// https://scotthelme.co.uk/content-security-policy-an-introduction/
// scanner: https://securityheaders.com/

const rootDomain = `your-domain.com`; // or your server IP for dev

const directives = {
  'img-src': [
    "*",
    "'self'",

524c

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

524c

// Core assets
let coreAssets = [];

// On install, cache core assets
self.addEventListener('install', function (event) {

	// Cache core assets
	event.waitUntil(caches.open('app').then(function (cache) {
		for (let asset of coreAssets) {
			cache.add(new Request(asset));

524c

// This works on all devices/browsers, and uses IndexedDBShim as a final fallback 
var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;

// Open (or create) the database
var open = indexedDB.open("MyDatabase", 1);

// Create the schema
open.onupgradeneeded = function() {
    var db = open.result;
    var store = db.createObjectStore("MyObjectStore", {keyPath: "id"});

524c

node-sass

Sass é uma linguagem de script que é interpretada ou compilada em Cascading Style Sheets (CSS). e neste GIST estarei demonstrando como usar sass com node js.

Primeiro passo

Iniciar um projecto do zero com a framework express

mkdir node_sass

524c

#!/bin/bash

#qemu-img create -f qcow2 disk.qcow2 20G
#qemu-img create -f qcow2 varstore.img 128M
debian_iso=debian-9.6.0-arm64-xfce-CD-1.iso
qemu-system-aarch64 -smp cpus=6 -M virt -cpu max -m 2G -nographic \
    -drive file=QEMU_EFI.img,if=pflash,format=raw \
    -drive file=varstore.img,if=pflash \
    -drive file=disk.qcow2,if=virtio \
    -drive file=$debian_iso,if=virtio,format=raw

524c

    ffmpeg -i jellyfish-120-mbps-4k-uhd-h264.mkv -c:v libx264 -profile:v main -vf scale=1920:1080 -b:v 50000k -an -tune fastdecode -coder 0 -flags -loop -g 30 -bf 0 -t 10 jellyfish-hd-50mbps_main_nosound_fast_short.mp4