pre_tasks:
- name: Gather minimum local MTU
set_fact:
local_mtu: >
{% set mtus = [] -%}
{% for interface in ansible_interfaces -%}
{% set interface_variable = 'ansible_' + interface -%}
{% if interface_variable in hostvars[inventory_hostname] -%}
{% set _ = mtus.append(hostvars[inventory_hostname][interface_variable]['mtu']|int) -%}
{% endif -%}
{% endfor -%}
{{- mtus|min -}}
- name: Calculate external_bridge_mtu
# 50 bytes is overhead for vxlan (which is greater than GRE
# allowing us to use either overlay option with this MTU.
# TODO(andreaf) This should work, but it may have to be reconcilied with
# the MTU setting used by the multinode setup roles in multinode pre.yaml
set_fact:
external_bridge_mtu: "{{ local_mtu | int - 50 }}" |