Philippe Back philippeback

Phoenix/Spark demo

These demo is part of a webinar on 'HBase for Mission Critical Applications'
The webinar recording /slides are available at http://hortonworks.com/partners/learn/#hbase2
The Ambari service for OpenTSDB is available at https://github.com/abajwa-hw/opentsdb-service
The full list of available workshops is available at http://hortonworks.com/partners/learn

Option 1: prebuilt VM

There is a prebuilt Centos 6.5 VM with the below components installed:

HDP 2.3.0.0-1754
Spark 1.3.1

Provisioning and usage of unprivileged LXC containers via indirect login or script

As I've discovered, managing LXC containers is fairly straightforward, but when building out a system for provisioning out user maintained instances of NodeBB, it was imperative that unprivileged LXC containers were used, so that in the event of shell breakout from NodeBB followed by privilege escalation of the saas user, the root user in the LXC container would only be an unprivileged user on the host machine.

During the course of development, I ran into numerous blockers when it came to managing LXC containers in unexpected circumstances. Namely:

Using LXC in a subshell is not directly supported. This usually happens under one of the following two circumstances:
- After switching users via su or executing lxc-* commands as another user via sudo
- Executing lxc-* commands via a program, application, or script. In my case, a Node.js application.

Installing Kerberos on Redhat 7

This installation is going to require 2 servers one acts as kerberos KDC server and the other machine is going to be client. Lets assume the FQDN's are (here cw.com is the domain name, make a note of the domain name here):

Kerberos KDC Server: kdc.cw.com
Kerberos Client: kclient.cw.com

Important: Make sure that both systems have their hostnames properly set and both systems have the hostnames and IP addresses of both systems in

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Ambari uses a local postgres db by default.This page describes how to use ambari-server with remote postgres server.

Install

Ambari is installed on centos 6.4 with the following command:

curl -so /etc/yum.repos.d/ambari.repo http://public-repo-1.hortonworks.com/ambari/centos6/1.x/GA/ambari.repo
yum repolist
yum -y install ambari-server

	\|tab ds b lb \|

	tab := RTTabTable new input: 'http://senegalouvert.org/data/core/Population-Senegal/r/Population%20Senegal.csv' asUrl retrieveContents usingDelimiter: $,.
	tab removeFirstRow.
	tab convertColumnsAsFloat: #(1 2 3 4).
	b := RTGrapher new.
	ds := RTDataSet new.
	ds interaction popup.
	ds points: tab values.
	ds dotShape color: (Color blue alpha: 0.3).

	#include <SFML/Audio.h>
	#include <SFML/Graphics.h>

	int main()
	{
	sfVideoMode mode = {800, 600, 32};
	sfRenderWindow* window;
	sfTexture* texture;
	sfSprite* sprite;
	sfFont* font;

	"INSTALL"

	Gofer new
	smalltalkhubUser: 'HwaJong' project: 'DaliotsPlayground';
	configuration;
	load.

	#ConfigurationOfDaliotsPlayground asClass project lastVersion load: 'KelticKnot'.

	<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
	<CodeBlocksConfig version="1">
	<editor>
	<colour_sets>
	<ACTIVE_COLOUR_SET>
	<str>
	<![CDATA[modnokai night shift v2]]>
	</str>
	</ACTIVE_COLOUR_SET>
	<ACTIVE_LANG>

	# tmux-mouse-toggle
	# via http://qiita.com/kawaz/items/7b15e18ca8e072c1dc57

	if [[ -n $TMUX ]]; then
	if [[ -z "$(tmux show-options -gw mode-mouse \| grep off)" ]]; then
	tmux set-option -gq mouse-utf8 off
	tmux set-option -gq mouse-resize-pane off
	tmux set-option -gq mouse-select-pane off
	tmux set-option -gq mouse-select-window off
	tmux set-window-option -gq mode-mouse off