Joachim Wiberg troglobit

Ubuntu Server Setup - with netplan

Introduction

The assumption here is that you're now starting with a Ubuntu 22.04 LTS Server or newer, rather than Desktop, base (Ubuntu Desktop deploys NetworkManager rather than systemd-networkd by default). This box has an AMD Ryzen CPU.

The goal is networking configured for static addressing using systemd-networkd and netplan. Note that punctuation (including hypens, '-') and indentation are significant when working with netplan YAML files.

There are a lot good arguments against using netplan. I have tried NetworkManager (packages named "network-manager", but the service is "NetworkManager.service" -- go figure) on Ubuntu Server, and was

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

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


	flip:
	@echo '\\/' \| sed -e 's:\\/://\\:'

	flip-adv:
	@echo '\\/' \| sed -e 's/\\\//\/\/\\/'

	flip-evil:
	@echo "\\\\\/" \| sed -e "s/\\\\\\\\\//\/\/\\\/"