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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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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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{
  "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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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

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JavaScript Crypto Libraries

I start with a list and plan to create a comparison table.

WebCryptoAPI

http://www.w3.org/TR/WebCryptoAPI/

This specification describes a JavaScript API for performing basic cryptographic operations in web applications, such as hashing, signature generation and verification, and encryption and decryption. Additionally, it describes an API for applications to generate and/or manage the keying material necessary to perform these operations. Uses for this API range from user or service authentication, document or code signing, and the confidentiality and integrity of communications.

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function readFile(file) {
    var reader = new FileReader();
    var deferred = $.Deferred();

    reader.onload = function(event) {
        deferred.resolve(event.target.result);
    };

    reader.onerror = function() {
        deferred.reject(this);

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'use strict';

var winston = require('winston'),
    util    = require('util');

//winston logging for papertrail
require('winston-papertrail').Papertrail;

var logger;

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/*jslint undef: true, nomen: true, eqeqeq: true, plusplus: true, newcap: true, immed: true, browser: true, devel: true, passfail: false */
/*global window: false, readConvertLinksToFootnotes: false, readStyle: false, readSize: false, readMargin: false, Typekit: false, ActiveXObject: false */

var dbg = (typeof console !== 'undefined') ? function(s) {
    console.log("Readability: " + s);
} : function() {};

/*
 * Readability. An Arc90 Lab Experiment. 
 * Website: http://lab.arc90.com/experiments/readability

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// http://stackoverflow.com/questions/10058226/send-response-to-all-clients-except-sender-socket-io
// send to current request socket client
socket.emit('message', "this is a test");

// sending to all clients, include sender
io.sockets.emit('message', "this is a test");

// sending to all clients except sender
socket.broadcast.emit('message', "this is a test");