whitlockjc

Useful kubectl commands not in the kubectl Cheat Sheet:

List all nodes and their external IP

kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.addresses[?(@.type=="ExternalIP")].address}{"\n"}{end}'

List all running Pods and their IP

kubectl get pods --all-namespaces -o jsonpath='{range .items[?(@.status.phase=="Running")]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'

whitlockjc

'use strict';

const fs = require('fs')
const http = require('http')

const K8S_HOST = process.env['K8S_HOST'] || '10.100.0.1'
const K8S_SECRET = process.env['K8S_SECRET'] ||
  fs.readFileSync('/var/run/secrets/kubernetes.io/serviceaccount/token', 'utf-8')

var req = http.request({

whitlockjc

Overview

Imagine you are an API Management company and your business depends on your ability to be involved in the request/response lifecycle for HTTP-based API traffic. Also imagine that you've got a Kubernetes cluster that runs both your company's applications and even some client applications. This means when it comes to doing API Management for all necessary traffic, you need to be involved in the request/response lifecycle for targets running within Kubernetes for both requests originating outside the cluster and even some (if not all) requests originating within the cluster. To continue this conversation, let's establish some terminology:

• Inter-Cluster: An external request is made for an API that maps to a resource running within Kubernetes

whitlockjc

Environment for Developing Kubernetes

First and foremost, this is not a document on how to create an environment for developing applications targeting Kubernetes as its runtime. This document is to outline the steps required to create an environment for contributing to Kubernetes based on recently setting up both Linux and Mac development environments. This document is written as if you will be creating your development enivonment on OS X but just know that things are basically the same when on other OSes. Of course, the installation and configuration of these tools will changed based on which OS you're on, and possibly other things, but the gist is that in this guide when you see that tool X is required, you follow whatever steps to install tool X on your OS.

whitlockjc

'use strict';

var FileInputFormat = require('hadoop-input').FileInputFormat;
var FileOutputFormat = require('hadoop-output').FileOutputFormat;
var counterGroup = 'Word Count Counters';
var uniqueWordCounterName = 'Unique Words';
var totalWordsCounterName = 'Total Words';
var uniqueWordsCounter;
var totalWordsCounter;

whitlockjc

;; Linum mode
(global-linum-mode t)

;; Custom face/function to pad the line number in a way that does not conflict with whitespace-mode
(defface linum-padding
  `((t :inherit 'linum
       :foreground ,(face-attribute 'linum :background nil t)))
  "Face for displaying leading zeroes for line numbers in display margin."
  :group 'linum)

whitlockjc

#!/usr/bin/env node

// Takes an rgba() CSS value and converts it to its 8 digit hexadecimal value.
//
// Usage: ./rgbaToHex.js "{YOUR_RGBA_STRING}"
//
// Example: ./rgbaToHex.js "rgba(197, 200, 198, .2)" => #C5C8C633

function trim (str) {
  return str.replace(/^\s+|\s+$/gm,'');