# Pastebin yjfwHgc8
root@amphora-8037fbeb-eb96-4d50-bd5e-02154c6ff9f9:/etc/network/interfaces.d# cat 50-cloud-init.cfg
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
auto lo
iface lo inet loopback

auto ens2
iface ens2 inet6 static
    address 2001:db8:cafe:0:f816:3eff:feb4:3eaa/64
    mtu 1450
    post-up route add -A inet6 default gw 2001:db8:cafe::1 || true
    pre-down route del -A inet6 default gw 2001:db8:cafe::1 || true