The-Edward

Install Prerequisites on ALL (Worker and Master) Nodes

Let's remove any old versions of Docker if they exist:

sudo yum remove docker \
                  docker-common \
                  docker-selinux \
                  docker-engine

The-Edward

A Guide to Encrypting Files with Mac OS X

This guide will demonstrate the steps required to encrypt and decrypt files using OpenSSL on Mac OS X. The working assumption is that by demonstrating how to encrypt a file with your own public key, you'll also be able to encrypt a file you plan to send to somebody else using their private key, though you may wish to use this approach to keep archived data safe from prying eyes.

Too Long, Didn't Read

Assuming you've already done the setup described later in this document, that id_rsa.pub.pcks8 is the public key you want to use, that id_rsa is the private key the recipient will use, and secret.txt is the data you want to transmit…

Encrypting

$ openssl rand 192 -out key

$ openssl aes-256-cbc -in secret.txt -out secret.txt.enc -pass file:key

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Benchmark commands

Producer

Setup

bin/kafka-topics.sh \
  --zookeeper zookeeper.example.com:2181 \
  --create \

The-Edward

Methods of Signing with GPG

Last updated March 28, 2021

There are now two ways to approach this:

1. Using gpg and generating keys
2. Using Kryptonite by krypt.co

This Gist explains how to do this using gpg in a step-by-step fashion. Kryptonite is actually wickedly easy to use-but you will still need to follow the instructions

The-Edward

#!/usr/bin/env bash
## Copyright (C) 2017, Oleksandr Kucherenko
## Last revisit: 2017-09-29 

# For help:
#   ./versionip.sh --help

# For developer / references:
#  https://ryanstutorials.net/bash-scripting-tutorial/bash-functions.php
#  http://tldp.org/LDP/abs/html/comparison-ops.html

The-Edward

RUN echo "https://mirror.yandex.ru/mirrors/alpine/v3.7/main" > /etc/apk/repositories \
 && echo "https://mirror.yandex.ru/mirrors/alpine/v3.7/community" >> /etc/apk/repositories \
 && echo "https://mirror.yandex.ru/mirrors/alpine/v3.5/main" >> /etc/apk/repositories \

The-Edward

curl -s https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
echo "deb http://build.openvpn.net/debian/openvpn/stable xenial main" > /etc/apt/sources.list.d/openvpn-aptrepo.list
apt update
apt install -y openvpn

The-Edward

import socket
import random
import argparse
import sys
from io import BytesIO

# Referrer: https://github.com/wuyunfeng/Python-FastCGI-Client

PY2 = True if sys.version_info.major == 2 else False

The-Edward

Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

• Producers send messages to brokers
• Consumers read messages from brokers
• Messages are sent to a topic

The-Edward

$ token="$(curl -fsSL "https://auth.docker.io/token?service=registry.docker.io&scope=repository:library/debian:pull" | jq --raw-output '.token')"
nisha@ubuntu ~ $ manifest="$(curl -fsSL -H "Authorization: Bearer $token" -H "Accept: application/vnd.docker.distribution.manifest.v2+json" "https://index.docker.io/v2/library/debian/manifests/sha256:e8bab439d86e39a0f694344ab0c11f77bce1460c13c903c437ee9da69c7b6fa3")"
nisha@ubuntu ~ $ echo $manifest | sha256sum
edb9b33918300be33fb87aa3b451493b94d0290edc9de95caae90f754996d0df  -