Macvlan bridge for host connectivity in Netplan and Networkd-dispatcher

:etc:netplan:01-macvlan-bridge.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    mvlan-bridge:
      addresses:
        - 192.168.0.10/32
      routes:
        - to: 192.168.0.128/28 # docker macvlan address range
          via: 192.168.0.10
          metric: 100

## n.b. Netplan does not yet support macvlans, so have to configure
#       the macvlan bridge in /etc/networkd-dispatcher/... scripts,
#       then modify it as an 'ethernets' entry here for IP and routes
#       https://bugs.launchpad.net/netplan/+bug/1664847/comments/19
#
# Manual config steps:
#
#     ip link add mvlan-bridge link eth0 type macvlan mode bridge
#     ip addr add 192.168.0.10/32 dev mvlan-bridge
#     ip link set mvlan-bridge up
#     ip route add 192.168.0.128/28 dev mvlan-bridge

:etc:networkd-dispatcher:routable.d:00-macvlan-bridge.sh

#!/bin/bash

## TODO: Move this script to /etc/networkd-dispatcher/configured.d/ once we've upgraded to 22.04 Kinetic

ip link add mvlan-bridge link eth0 type macvlan mode bridge

# ip link add mvlan-bridge link eth0 type macvlan mode bridge
# ip addr add 192.168.0.10/32 dev mvlan-bridge
# ip link set mvlan-bridge up
# ip route add 192.168.0.128/28 dev mvlan-bridge

# Add to docker-compose macvlan network ipam.config:
# aux_addresses:
#   mvlanbridge: 192.168.0.10

docker-compose.yaml

networks:
  ...
  vlan-123:
    driver: macvlan
    driver_opts:
      parent: eth0
    enable_ipv6: true
    ipam:
      config:
        - subnet: 192.168.0.0/24
          gateway: 192.168.0.1
          ip_range: 192.168.0.128/28 # 14 usable addrs for macvlan containers, .129–.142
          aux_addresses:
            mvlanbridge: 192.168.0.10
        - subnet: fe80:dead:beef::/80