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Setuping PI-Hole FTL DNS on a local network

pihole comes with it's own lightweight DNS server called FTL. It's geared towards easy of use. Even so, setting up this feature can be hard. Here are some lessons I've learned.

In this example:

• Your network is setup on 192.168.1.0/24
• 192.168.1.1 is your DHCP server and IP gateway. (usually your router)
• 192.168.1.254 is the host running pi-hole

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Installing pqsl, pg_dump and pg_restore via hombrew

These instructions allow you to intall psql, pg_dump & pg_restore without a full installation of postgresql.

First, install libpq via homebrew

brew doctor
brew update
brew install libpq

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Installation and initial setup of PostgreSQL for local use

Step 1: Installation of PostgreSQL

Add the YUM repo to your host:

$ sudo dnf install https://download.postgresql.org/pub/repos/yum/reporpms/F-37-x86_64/pgdg-fedora-repo-latest.noarch.rpm

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Creating and managing an SSH session in the background

Sources:
https://stackoverflow.com/questions/2241063/bash-script-to-set-up-a-temporary-ssh-tunnel/15198031#15198031
https://lists.gt.net/openssh/dev/48040#48040

Starting an SSH session

$ ssh -M -S my-ctrl-socket -fnNT user@host.tld

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Installing Fedora 30/31 on a Dell XPS 13 9380 series in dual boot mode

This guide describes how to install Fedora 30/31 next to Windows 10 on a Dell XPS 13 9380 series in dual boot.

• Keep the stock Windows 10 installation that came with the laptop.
• Install Fedora 30 alongside Windows on the hard disk.
• Install GRUB as the bootloader allowing you to choose which OS to boot from.

Authored: September 2019

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#!/bin/bash
DIR=$1

if [[ ! -d $DIR ]];then
    echo "${DIR} does not exist."
    exit 1
fi

BASENAME=$(basename $DIR)
UPDIR=$(cd $DIR/.. && pwd)

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Comparing two files each containing a single column dataset with Perl

Warning! One liners such as these are basically hacks. Please look into the comm program which is part of GNU Coreutils. It basically does all of this without any of the complexity below. See: https://www.gnu.org/software/coreutils/manual/html_node/comm-invocation.html

You have 2 text files, each containing rows of data each having 1 column (e.g. e-mail address, uuids, names, md5 hashes,...). You want to very quickly compare those, spending the least amount of time and energy, looking for ...

• ... rows both files have in common (intersection)
• ... rows which are in file A but not in file B.
• ... rows which are in file B but not in file A.

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#!/usr/bin/python3
#
# run it:
# STIBKEY=<apikey> ./stib.py

import os
import requests
import json
import datetime
from datetime import timedelta

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Installation and initial setup of Elasticsearch on Fedora

Installation of ES 6.8

$ sudo dnf install java-latest-openjdk
$ sudo rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
$ cat <<EOF | sudo tee /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-6.x]
name=Elasticsearch repository for 6.x packages

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flowchart LR
    W((World)) --- TR
    TR --- KC(Keycloak)
    BB --- KC
    subgraph Nomad
    TR(Traefik proxy) --- BB
    BB(Biblio backend) --- NATS{NATS}
    NATS --- JB{JMS bridge}
    JB --- F(Fedora repository)
    NATS --- IDX(Indexer service)