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randpasswd() {
  NUM=${1:-32}

  # macOS scenario
  if [[ $(uname -s) == "Darwin" ]]; then
    perl -pe 'binmode(STDIN, ":bytes"); tr/A-Za-z0-9//dc;' < /dev/urandom | head -c $NUM
  else
    # tested with: GNU/Linux, Cygwin, MSys
    tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w $NUM | sed 1q
  fi

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mkdir ./{vault,dgraph}

cat << 'EOF' > compose.yml
services:
  zero1:
    image: dgraph/dgraph:${DGRAPH_VERSION}
    command: dgraph zero --my=zero1:5080 --replicas 1 --raft idx=1
    ports:
      - 6080:6080
    container_name: zero1

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Installation

Goal: Install Consul 1.17.0.

# INSTALL
# Source: https://developer.hashicorp.com/consul/downloads
wget -O- https://apt.releases.hashicorp.com/gpg \
  | sudo gpg --dearmor -o /usr/share/keyrings/hashicorp-archive-keyring.gpg

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What is the difference between cpan and cpanm?

This was explanation by Grant McLean

CPAN CLI

cpan the CPAN shell has been shipped with Perl since about 1997. When you run it the first time it asks a bunch of questions and saves the answers in a config file. Then you can install a module by running:

cpan -i Module::Name

The shell provides other commands for searching CPAN and looking inside distribution files.

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Pedantic ADHD Guide to Kubenretes Provisioning

This is my guide for how to get Kubernetes provisioned using Azure, Google Cloud, or AWS using CLI tools. This will require setting up an account with local CLI tools. The goal of this is to quickly set up a disposable test clusters in minimalist way.

The Tools

Some tools used here:

• General
• direnv (direnv) - used to setup environment variables automatically

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Intro

TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.

Setup Your Script

The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:

#!/usr/bin/expect

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# -*- mode: ruby -*-
# vi: set ft=ruby :

# default constants
TIME = Time.now.strftime('%Y%m%d%H%M%S')
CONFIGFILE_HOSTS = './config/hosts'
VAGRANT_BOX = 'bento/ubuntu-14.04'

# build hosts hash
hosts = {} 

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ArchLinux Virtualbox STEP-by-STEP

These are my ArchLinux on Virtualbox notes with some added explanations.

• Joaquin Menchaca (Nov 6, 2017)

Create Virtualbox System

This is handcrafted creation of using Virtualbox using defaults with these adjustments:

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EKS_CLUSTER_NAME=${EKS_CLUSTER_NAME:-"my-cluster"}
NODE_GROUP=$(aws eks list-nodegroups \
  --cluster-name $EKS_CLUSTER_NAME \
  | jq -r '.nodegroups[0]'
)
ROLE_ARN=$(aws eks describe-nodegroup \
  --cluster-name $EKS_CLUSTER_NAME \
  --nodegroup-name $NODE_GROUP \
  | jq -r '.nodegroup.nodeRole'
)

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Prepare ISO Notes

These are notes on this process to prepare an install CD so that you can create a virtual Mac OS X. This is useful for testing scripts.

Prepare ISO Script

#!/bin/sh -e
#
# Preparation script for an OS X automated installation for use with VeeWee/Packer/Vagrant