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Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

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#This script was written by REXOVAS to automate 90% of a ZEN Secure Node setup process for an IPv4 node.
#Parts of this script were adapted from a script by github user rnkhouse
#rnkhouse script found here: https://gist.github.com/rnkhouse/f7f04f0cb10b596e2c6623275968a220
#Prior to running this script, please ensure that you are not signed in as root, and have completed all steps up until the copying
#of authentication key pairs in this guide: https://blockoperations.com/build-zencash-secure-node-part-1-prepare-vps/

#This script performs all actions described in the 3 guides found on blockoperations.com.  It compiles zend from source.
#This script installs both Monit and PM2 and automatically configures monit to monitor zend.

#WARNING:  This script is intended for use by advanced Linux users.  Please read through this script thoroughly to ensure that

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#/bin/bash
#Ask some info
echo -n "Enter ELK Server IP or FQDN: "
read eip
echo -n "Enter Admin Web Password: "
read adpwd

#Update System
sudo apt-get update
sudo apt-get upgrade -y

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Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

docker volume rm $(docker volume ls -qf dangling=true)
docker volume ls -qf dangling=true | xargs -r docker volume rm

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#!/bin/bash

rep=$(curl -s --unix-socket /var/run/docker.sock http://ping > /dev/null)
status=$?

if [ "$status" == "7" ]; then
    echo 'not connected'
    exit 1
fi

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#!/usr/bin/env bash

# IMPORTANT: Run this script from /home/<USER>/ directory: bash -c "$(curl SCRIPT_URL)"


# (optional): Preparing the environment if you want to install zen from source:
# Once you get the VM up and running you need to login with your root account and run below commands.
# apt-get update && apt-get upgrade -y
# apt-get install -y build-essential pkg-config libc6-dev m4 g++-multilib autoconf libtool ncurses-dev unzip git python zlib1g-dev wget bsdmainutils automake libgtk2.0-dev && apt-get autoremove -y

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set serveroutput on;

declare
  raw_guid raw(16);
  guid varchar2(64);
begin
  
  raw_guid := guid_to_raw ('88c6a267-65d2-48d6-8da2-6f45e2c22726');
  guid := raw_to_guid('67A2C688D265D6488DA26F45E2C22726');
  

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# content has to be in .config/fish/config.fish
# if it does not exist, create the file
setenv SSH_ENV $HOME/.ssh/environment

function start_agent                                                                                                                                                                    
    echo "Initializing new SSH agent ..."
    ssh-agent -c | sed 's/^echo/#echo/' > $SSH_ENV
    echo "succeeded"
    chmod 600 $SSH_ENV 
    . $SSH_ENV > /dev/null

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Raspberry Pi VPN Router

This is a quick-and-dirty guide to setting up a Raspberry Pi as a "router on a stick" to PrivateInternetAccess VPN.

Requirements

Install Raspbian Jessie (2016-05-27-raspbian-jessie.img) to your Pi's sdcard.

Use the Raspberry Pi Configuration tool or sudo raspi-config to:

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wget https://git.io/vpnsetup -O vpnsetup.sh && sudo \
VPN_IPSEC_PSK='your_ipsec_pre_shared_key' \
VPN_USER='your_vpn_username' \
VPN_PASSWORD='your_vpn_password' sh vpnsetup.sh