How to define multiple NICs on a host in Ansible with K5. Note this is redacted from my own code, so yours may need some tweaking and changes!

group_vars~all

---
compute_images:
  REDACTED:
    name: "REDACTED"

compute_types:
  REDACTED:
    name: "REDACTED"

az:
  1a:
    name: "1a"
    region: "1"
    keypair: "1a"

Networks:
  External_1a:
    name: "External-1a"
    shortname: "External"
    az: "{{ az.1a }}"
    cidr: "192.0.2.0/26"
    gateway_ip: "192.0.2.1"
    ext_net: "az1a-net1"
  DMZ_1a:
    name: "DMZ-1A"
    shortname: "DMZ"
    az: "{{ az.1a }}"
    cidr: "192.0.2.64/26"
    gateway_ip: "192.0.2.65"

Compute_Hosts:
  ThisHost:
    name: "ThisHost"
    image: compute_images.REDACTED.name
    flavor: compute_types.REDACTED.name
    az: "{{ az.1a }}"
    log_size: "150"
    os_size: "10"
    ports:
      - network: "{{ Networks.External_1a }}"
      - network: "{{ Networks.DMZ_1a }}"
        fixed_ip:
          - "{{ Networks.DMZ_1a.gateway_ip }}"

playbook.yml

---
- name: "Host Port Creation"
  k5_port:
    state: present
    name: "{{ item.0.name }}-Port-{{ item.1.network.name }}"
    network_name: "{{ item.1.network.name }}"
    subnet_name: "{{ item.1.network.name }}"
    availability_zone: "{{ item.0.az.name }}"
    fixed_ip: "{{ item.1.fixed_ip|default(omit) }}"
    allowed_address_pairs: "{{ item.1.allowed_address_pairs|default(omit) }}"
    security_groups: "{{ item.1.security_group|default('default') }}"
    k5_auth: "{{ k5_auth_reg.k5_auth_facts }}"
  with_subelements:
    - "{{ Compute_Hosts }}"
    - ports

- name: "Create Log Storage"
  os_volume:
    display_name: "{{ item.value.name }}-Log-Volume"
    availability_zone: "{{ item.value.az.name }}"
    state: present
    size: "{{ item.value.log_size }}"
    region_name: "{{ item.value.az.region }}"
  with_dict: "{{ Compute_Hosts }}"
  when: item.value.log_size is defined

- name: "Create host"
  os_server:
    name: "{{ item.value.name }}"
    state: present
    availability_zone: "{{ item.value.az.name }}"
    image: "{{ item.value.image_name }}"
    flavor: "{{ item.value.flavor }}"
    key_name: "{{ item.value.az.keypair }}"
    nics: "[{%- for nwname in item.value.ports -%}{'port-name': '{{ item.value.name }}-Port-{{nwname.network.name}}'}{%- if not loop.last -%}, {%- endif -%} {%- endfor -%}]"
    volume_size: "{{ item.value.os_size }}"
    boot_from_volume: yes
    terminate_volume: yes
    volumes:
      - "{{ item.value.name }}-Log-Volume"
    auto_ip: no
  with_dict: "{{ Compute_Hosts }}"

That looks spot on matey.

In context this makes sense now.

nics: "[{%- for nwname in item.value.ports -%}{'port-name': '{{ item.value.name }}-Port-{{nwname.network.name}}'}{%- if not loop.last -%}, {%- endif -%} {%- endfor -%}]"
...
with_dict: "{{ Compute_Hosts }}"