Bash Scripts for Cloudinary

Cloudinary is an amazing image hosting service that offers both a highly functional free tier in addition to a paid enterprise grade image hosting and transformation service.

In this tutorial I demonstrate a few simple bash shell scripts to interface with Cloudinary.

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Easily disable Pihole from your iPhone (or iPad)

If you run a pihole the odds are good that you’ve needed to disable it from time to time. I wanted an easy way to disable my pihole(s) temporarily, so I wrote a simple shell script to do it for me. I’m almost always on my Macbook, so this approach worked for a while. I needed to disable it a few times while I was out of the room, so I figured I’d find an easier way to do it from my phone.
I already used an iOS app called Launcher on my iphone, so integrating pihole api calls with it seemed like a no-brainer. For convienience, it can be used from your lock screen without having to unlock your phone.

Using the Launcher Widget to disable pihole

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Service monitoring with Monitorr

Monitorr

2018/10/27
As part of my dashboard project (link coming soon) I was looking for a lightweight self hosted monitoring solution for my home network services. I found Monitorr and decided it was a perfect fit for my needs. It’s simple and it doesn’t have any frills, which is exactly what I wanted.

I use it with an iOS app called Glimpse to keep an eye things from my phone via a widget:
Glimpse

You can find installation instructions and download it from here.

Speeding up Ansible Playbook runs

Ansible is a great tool for configuration management but because of the way it’s designed a common complaint is that it’s not as fast as other tools like Salt, Chef or Puppet. This is because Ansible doesn’t have an agent that listens (although it can) on a host and uses a different type of deployment methodology that is based on SSH. This post isn’t about the pros and cons of each tool, but rather about ways to improve upon Ansible’s default configuration values. By default Ansible ships with very conservative default values. This is smart in my opinion because it offers greater compatibility out-of-the-box. Here I highlight some safe adjustments that can be made to the default configuration for improved performance (speed!)

Real World Playbook Test

For this test I’m using a real-world playbook that I use in my homelab when provisioning a new CentOS VM. It configures some basic things (hostname, ssh keys, etc), installs common packages/utilities and tunes some OS configurations.

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Dynamic DNS via Digital Ocean API

This is a quick tutorial about setting up a simple shell script that runs periodically to update a DNS record on the internet with the IP address of your network. If you’ve ever wanted to have myhome.mydomain.com always updated with your home IP address, this is one way you can do it. There are paid and free services that offer this functionality, but I choose to use this method because it gives me ultimate flexibility over my domain.
This tutorial assumes you have your own Top Level Domain (TLD) and that you’ve configured it to use Digital Ocean as the authoritative DNS for it. Here, I’ll use “example.com” as the top level domain.

Generate a Personal Access Token

Log in to Digital Ocean and click on API from the top Menu. Click the Generate New Token button and give it a name. The name is not parsed, it’s just for your own reference. I like to give it something descriptive to my application. For this example, I’ll use MyDNS. Be sure to check the box next to Write so we can update the records using this API Key.

Once you have the API Key, save it somewhere for reference. It’s one of the 3 variables we’ll need to update in the update_do_dns.sh script.

The API Key will look something like this:
fe3aeda96b7wer8wer1e6bb5erae528sdf3a6120dfrf7e492bwer6343fsdf

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A simple Ansible playbook for updating multiple Pihole DNS

I wrote a very simple little playbook for updating my local DNS records for my piholes. For me it’s easier than manually ssh’ing onto each node and editing a file and restarting the service. Here’s the playbook:

update_dns.yml

#!/usr/bin/env ansible-playbook

- hosts: ns-01, ns-02
gather_facts: yes
sudo: yes
tasks:
- name: TASK | Copy dnsmasq config for cbnet
template: src=templates/02-localnet.conf.j2 dest=/etc/dnsmasq.d/02-localnet.conf force=yes
- name: TASK | Copy updated dns file
template: src=templates/localnet.list.j2 dest=/etc/pihole/localnet.list force=yes
- name: TASK | Restart dnsmasq
service:
name: dnsmasq
state: restarted

This playbook adds a DNSmasq config file for my local network and copies a template file (dnsmasq include file for my local network) and restarts DNSmasq. Here is the template (sample):
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Using Ansible to build a high availablity Nzbget usenet downloader

I’m limited to about 80MB/s on downloads on my VPC at Digital Ocean, but I run Nzbget for downloading large files from usenet. It doesn’t take long to download at all, but out of curiosity I wanted to see if I could parallelize this and download multiple files at the same. I use Sonarr for searching usenet for freely distributable training videos which then sends them to NZBget for downloading. Since Sonarr can send multiple files to nzbget which get queued up, I figured I can reduce the queue by downloading them at the same time.

Using Ansible and Terraform (devops automation tools), I can spin up VPC on demand, provision them, configure them as nzbget download nodes and then destroy the instances when complete.

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Record and playback terminal sessions with Showterm

Showterm

I just found a neat tool that will let you record a bash session for playback / site linking. It’s called Showterm. Adding the playback video is as simple as adding an iframe to your page:

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<iframe src="https://showterm.io/7b5f8d42ba021511e627e" width="640" height="480"></iframe>

or pasting the url:

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http://showterm.io/7b5f8d42ba021511e627e

Here’s a sample:

Using Ansible to build a high availablity Sabnzbd usenet downloader

I’m limited to about 40MB/s on downloads on my VPC at Digital Ocean, but I run Sabnzbd for downloading large files from usenet. It doesn’t take long to download at all, but out of curiosity I wanted to see if I could parallelize this and download multiple files at the same. I use Sonarr for searching usenet for freely distributable training videos which then sends them to SABnzbd for downloading. Since Sonarr can send multiple files to sabnzbd which get queued up, I figured I can reduce the queue by downloading them at the same time.

Using Ansible and Terraform (devops automation tools), I can spin up VPC on demand, provision them, configure them as sabnzbd download nodes and then destroy the instances when complete.

The instances all run the same sabnzbd config and the instances use haproxy for round-robin distribution. I will probably change this to Consul, but I just wanted something quick so I used a basic haproxy config.

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System info bash script

I put together a quick bash shell script to view system info at a glance. I know there are existing tools for this like inxi, but I wanted to put something together I can copypasta. This is specific to RHEL, Centos and Sci Linux but it can be easily adapted for other distros.

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Inxi - a utility for viewing system information

Inxi

inxi is a super handy system info utility. These days I typically work with ephemeral instances / microservers, so I just dispose of infrastructure that flakes out. Occassionally I’ll need to see what’s up with a box so I’ve put together some common invocations of inxi below for reference:

Common Invocations

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