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Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

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Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -aes256 -out ca.key 4096
openssl req -sha256 -new -x509 -days 3650 -key ca.key -out ca.crt

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# referecing: # https://www.digitalocean.com/community/tutorials/how-to-install-apache-kafka-on-ubuntu-14-04 # https://chongyaorobin.wordpress.com/2015/07/08/step-by-step-of-install-apache-kafka-on-ubuntu-standalone-mode/

1. Add 'kafka' user:

$ sudo useradd kafka -m

2. Install Java:

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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# unicorn

description "unicorn ruby app server"

start on (local-filesystems and net-device-up IFACE=lo and runlevel [2345])
stop on runlevel [!2345]

env WORKDIR=/data
env PIDFILE=/data/tmp/pids/unicorn.pid
env CFGFILE=/data/config/unicorn.rb

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#
# INPUT - Logstash listens on port 8514 for these logs.
#

input {
  udp {
    port => "8514"
    type => "syslog-cisco"
  }