Fix Traefik container not being reachable after restarts

ufw_traefik_fix.sh

#!/usr/bin/env bash
#
# Update the ufw rules such that a Traefik container is reachable

set -e

for cmd in ufw-docker ufw docker; do
    if ! command -v "$cmd" > /dev/null; then echo "Install $cmd first!"; exit 1; fi
done

disallowTraefik() {
    ufw-docker delete allow traefik
    ufw reload
}

allowTraefik() {
    ufw-docker allow traefik
    ufw reload
}

traefikName="traefik"
currentIp="$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $traefikName)"

echo "Traefik IP address: $currentIp"

echo "Current UFW rules:"
ufw status numbered | grep "allow traefik" || true

ipList="$(ufw status numbered | grep "allow traefik" | cut -d' ' -f 3 | sort | uniq)"

if [ -z "$ipList" ]; then
    echo "No rules for traefik set up yet!"
    allowTraefik
    exit 0
fi

numIps="$(echo $ipList | wc -l)"

if [[ $numIps -ne 1 ]]; then
    echo "More than one IP for traefik!"
    exit 1
fi

if [[ $currentIp == $ipList ]]; then
    echo "Current IP is up to date"
    exit 0
else
    echo "Current IP $currentIp is not the same as $ipList"!
    disallowTraefik
    allowTraefik
fi