A python script for creating network namespace to use with FreeIPA container.

ipa_net.py

#!/usr/bin/env python3
from contextlib import suppress
from pyroute2 import NetNS
from pyroute2 import IPRoute
ph_interface = "eth0"
container_name_space = "ipans"
container_link = "ipalink"
floating_ip = "your.server.floating.ip"
hetzner_gw = "172.31.1.1"
ipr = IPRoute()
base_link = ipr.link_lookup(ifname=ph_interface)[0]
netns = NetNS(container_name_space)
with suppress(Exception):
    ipr.link("add", ifname=container_link, kind="ipvlan", link=base_link, ipvlan_mode=0)
    ipvl_link = ipr.link_lookup(ifname=container_link)[0]
    ipr.link("set", index=ipvl_link, net_ns_fd=container_name_space)
    ipvl_link = netns.link_lookup(ifname=container_link)[0]
    netns.addr("add", index=ipvl_link, address=floating_ip, mask=32)
    netns.link("set", index=ipvl_link, state="up")
    netns.route("add", dst=hetzner_gw, mask=32, oif=ipvl_link, scope="link")
    netns.route("add", dst="0.0.0.0/0", gateway=hetzner_gw, oif=ipvl_link)
netns.close()