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GKE Persistent Volumes

Let's play around with persistent volumes on GKE.

Setup stuff

$ gcloud init
<output_omitted>

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If you are playing around with Kafka you, probably, would prefer to use containers. But, for some reason, you may want to use VMs instead. With this Vagrant script you can get a cluster installed and configured locally with a few steps.

Note that this script doesn't use the most recent version of Kafka. But you can change the version by changing the lines 12 and 13 of the script. Check the Confluent Platform and Apache Kafka Compatibilty table for details.

Instructions to execute and test

1. Install Virtual Box https://www.virtualbox.org/

2. Install Vagrant >= 1.6.4 http://www.vagrantup.com/

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Async functions in a usage context

The task we want to accomplish in this example is, given a URL and a file system path, download the document content and save it in the file system.

Let's begin our example by using the modules request and fs to perform the task directly:

const request = require('request')
const fs = require('fs')

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package com.todevornot.hncounter

import com.rometools.rome.io.SyndFeedInput
import com.rometools.rome.io.XmlReader
import java.net.URL

val HN_URL = URL("https://news.ycombinator.com/bigrss")

fun main(args: Array<String>) {

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buildscript {
    ext {
        versions = [
                gradle           : '3.2.1',
                springBoot       : '1.4.3.RELEASE',
                springfox        : '2.6.1',
                lombok           : '1.16.10',
                lombok_plugin    : '1.6',
				commons_io       : '2.5',
				commons_lang     : '3.4',

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Integer[] array = {1, 1, 1, 2, 2, 2, 4, 4, 1, 1, 2, 5, 5,};
Map<Integer, Long> collect =
    Arrays.stream(array).collect(
        Collectors.groupingBy(Function.identity(), Collectors.counting()));

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double fixedCost = 0.1;
double variableCost = 0.7;

double totalCost = fixedCost + variableCost;

System.out.println(totalCost);
//output: 0.7999999999999999

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import feedparser, operator
import re
from stop_words import get_stop_words
from time import gmtime, strftime

stop_words = get_stop_words('en')

OUTPUT_FOLDER = 'out/'

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package br.com.soeirosantos;

import java.util.LinkedList;
import java.util.Queue;
import java.util.Stack;

public class Main {

	public static void main(String[] args) {
		System.out.println(isAlmostPalindrome("abcddcba", 0));

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#!/bin/bash

#Title : wildfly-install.sh
#Description : Script to install Wildfly 8.x on CentOS 7
#Original script: http://sukharevd.net/wildfly-8-installation.html     
         
# This version is the only variable to change when running the script
WILDFLY_VERSION=8.2.1.Final
WILDFLY_FILENAME=wildfly-$WILDFLY_VERSION
WILDFLY_ARCHIVE_NAME=$WILDFLY_FILENAME.tar.gz