Query Hetzner Cloud-Node for your servers

which-cloudnode.sh

#!/bin/bash
set -euo pipefail

###
# Query Hetzner Cloud-Node for your servers
#
# Wanna know whether a specific outage affects one of your cloud nodes?
# Make a list of nodes before the outage happens and you'll know whether
# your server is hosted on the node with the outage...
#
# Requirements: mtr (tool), API token for your Hetzner Cloud Project in
# ENV variable HETZNER_TOKEN
#
# License: None. It's just some shell commands glued together. Do with
# it what you want, just don't blame me if everything goes south.
###

declare -A hosts

function check_env() {
	command -v mtr &>/dev/null || {
		echo "Missing MTR utility" >&2
		exit 1
	}

	[[ -n ${HETZNER_TOKEN:-} ]] || {
		echo 'Missing Hetzner API Token in $HETZNER_TOKEN' >&2
		exit 1
	}
}

function fetch_hosts() {
	for iphost in $(
		curl -sSfL \
			-H "Authorization: Bearer ${HETZNER_TOKEN}" \
			"https://api.hetzner.cloud/v1/servers" |
			jq -r '.servers | .[] | .public_net.ipv4.ip + "|" + .name'
	); do
		local ip=$(echo "${iphost}" | cut -d '|' -f 1)
		local name=$(echo "${iphost}" | cut -d '|' -f 2)
		hosts[${name}]=${ip}
	done
}

function get_cloudnode() {
	mtr -r -c1 "${1}" | grep -Eo '[0-9]*.your-cloud.host' | cut -d '.' -f 1 | tail -n1 || echo "n/a"
}

function log() {
	echo -e "\e[36m[$(date +%H:%M:%S)] $1\e[0m" >&2
}

function main() {
	check_env

	log "Fetching hosts of account..."
	fetch_hosts

	log "Finding cloud nodes..."
	for name in "${!hosts[@]}"; do
		echo -e "Host ${name}\tCloud-Node $(get_cloudnode ${hosts[$name]})"
	done

	log "All done."
}

main