all-in-one/Containers/docker-socket-proxy/start.sh

#!/bin/sh

# Only start container if nextcloud is accessible
while ! nc -z "$NEXTCLOUD_HOST" 9000; do
    echo "Waiting for Nextcloud to start..."
    sleep 5
done

set -x
IPv4_ADDRESS_NC="$(dig nextcloud-aio-nextcloud IN A +short | grep '^[0-9.]\+$' | sort | head -n1)"
HAPROXYFILE="$(sed "s|NC_IPV4_PLACEHOLDER|$IPv4_ADDRESS_NC|" /haproxy.cfg)" 
echo "$HAPROXYFILE" > /tmp/haproxy.cfg

IPv6_ADDRESS_NC="$(dig nextcloud-aio-nextcloud AAAA +short | grep '^[0-9a-f:]\+$' | sort | head -n1)"
HAPROXYFILE="$(sed "s# || { src NC_IPV6_PLACEHOLDER }##g" /tmp/haproxy.cfg)"
# shellcheck disable=SC2001
HAPROXYFILE="$(echo "$HAPROXYFILE" | sed "s|NC_IPV6_PLACEHOLDER|$IPv6_ADDRESS_NC|")" 
echo "$HAPROXYFILE" > /tmp/haproxy.cfg
set +x

haproxy -f /tmp/haproxy.cfg -db