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#!/bin/sh

# Some things taken from here
# https://github.com/mathiasbynens/dotfiles/blob/master/.osx

# Set the colours you can use
black='\033[0;30m'
white='\033[0;37m'
red='\033[0;31m'
green='\033[0;32m'

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public class SSLProtocolTests {
    public static void main(String[] args) throws Exception {
        SSLContext context = SSLContext.getDefault();
        SSLSocketFactory factory = (SSLSocketFactory)context.getSocketFactory();
        SSLSocket socket = (SSLSocket)factory.createSocket();

        String[] protocols = socket.getSupportedProtocols();

        System.out.println("Supported Protocols: " + protocols.length);
        for(int i = 0; i < protocols.length; i++)

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# Tested on OSX Yosemite 10.10.4
# there is also an updated version (work in progress) for El Capitan here https://gist.github.com/guycalledseven/31ffe35eca056838b06b

# XXX TODO
# should I disable com.google.Keystone.Agent ??
# http://applehelpwriter.com/2014/07/13/how-to-remove-googles-secret-update-software-from-your-mac/


# Stop DS_Store file creation on network connections
# restart Finder afterwards

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Bash if expressions cheatsheet

• Table
  • String
  • Integer
  • File system
  • File compare modification/exists
  • Combine expressions
• Notes
• Reference

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Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

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Your blockchain must have all of the following properties:

• It's a merkle tree, or a construct with equivalent properties.
• There is no single point of trust or authority; nodes are operated by different parties.
• Multiple 'forks' of the blockchain may exist - that is, nodes may disagree on what the full sequence of blocks looks like.
• In the case of such a fork, there must exist a deterministic consensus algorithm of some sort to decide what the "real" blockchain looks like (ie. which fork is "correct").
• The consensus algorithm must be executable with only the information contained in the blockchain (or its forks), and no external input (eg. no decisionmaking from a centralized 'trust node').

If your blockchain is missing any of the above properties, it is not a blockchain, it is just a ledger.

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These are notes for my Prometheus workshop. The follow-up workshop on Prometheus/Kubernetes can be found here.

Overview

• Technology: Time Series Database
• Approach: Black Box vs White Box
• Scope: Time Series (Prometheus) vs. Logfiles (ELK), vs. Tracing (Zipkin)

node_exporter

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These are notes for my Kubernetes/Prometheus workshop. The notes for the Prometheus introduction workshop can be found here.

The first part of this workshop is taken from episode 001 of the excellent TGI Kubernetes series by Heptio.

The demo runs on AWS.

Preparation (before the workshop)

Before the demo, do the following:

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@startuml fancy
skinparam sequence {
  LifeLineBorderColor Green
  ArrowColor black
  ParticipantBorderColor black
  ParticipantBackgroundColor GreenYellow
  ParticipantFontColor black
}
skinparam actor {
  backgroundColor white

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# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)

from abc import ABCMeta
from array import array
from base64 import b64encode, b64decode
from Crypto import Random
from Crypto.Cipher import AES
from Crypto.Hash import SHA256