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apiVersion: v1
kind: Pod
metadata:
  name: ubuntu
  labels:
    app: ubuntu
spec:
  containers:
  - image: ubuntu
    command:

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// adapted from https://github.com/uber-go/zap/blob/master/zapcore/json_encoder.go
// and https://github.com/uber-go/zap/blob/master/zapcore/console_encoder.go
package logging

import (
	"encoding/base64"
	"encoding/json"
	"math"
	"sync"
	"time"

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# either build from source or dnf install cups
sudo systemctl enable cups.service
sudo systemctl start cups
# open up firewalld ports
sudo firewall-cmd --zone=internal --add-port=631/tcp
sudo firewall-cmd --zone=internal --add-port=192.168.0.0/16

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rsync -avhW --no-compress --progress [from_dir] [to_dir]

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

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#!/bin/bash -e

APP=$1
ENV=$2

if [ -z "$APP" ] || [ -z "$ENV" ]; then
  echo -e "Missing parameters\n\nUsage:\n\tswitch_kubectl [app_name] [environment]"
  exit 0
fi

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// Flattens nested arrays down to one
// ex. [[1,[2,[3,4]]],5,[6],[[[7]]]] => [1,2,3,4,5,6,7]
Array.prototype.flatten = function flatten() {
  return this.reduce(function(acc, item) {
    if (Array.isArray(item) && item.some(Array.isArray)) {
      return acc.concat(item.flatten());
    }
    return acc.concat(item);
  }, []);
};

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{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "AWS CloudFormation sample template that contains a single Lambda function behind an API Gateway",

  "Resources": {

    "GreetingLambda": {
      "Type": "AWS::Lambda::Function",
      "Properties": {

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/**
 * Searches through an array finding all
 * occurences of predicates
 * @param arr {array}
 * @param searchVals {array}
 * @return findCountData {object} 
 */
function findAll (arr: any[], searchVals: any[]) {
  let findCounts = searchVals.reduce((acc, val) => {
    acc[val] = 0;

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Pseudocode:

Y = Base64URLEncode(Header) + ‘.’ + Base64URLEncode(Payload)
JWT = Y + ‘.’ + Base64URLEncode(HMACSHA256(Y))

The steps called out here should work on a Mac as well. The only thing that might be different is the sed command used below. Instead of using -E, you will have to use -r to run sed with extended regular expression support

Use data from this tutorial:

scotch.io