Ansible : Loop inside loop

Question

On ansible [core 2.13.3] my var.yml file is like this :

vlans:
  Servers:
    vlan_id: 10
    ip: 192.168.22.20
    mask: 255.255.255.0
    mode:
      tagged: 1/1,1/2
      untagged: 1/3
  Clients:
    vlan_id: 20
    mode:
      tagged: 1/1,1/3
  Printers:
    vlan_id: 30

The objective is to launch one task for each elements in vlans (Servers, Clients, Printers...) and for each mode (tagged, untagged, forbid...).

I successful iterate on vlans but not in vlans and mode. I can't find the good way to success nested loop. Try everything like subelement, with_subelements, loop_nested without success.

  - name: Set member of vlan
    arubaoss_vlan:
      command: config_vlan_port
      config: "create"
      vlan_id: "{{ item.value.vlan_id }}"
      port_id: "{{ item.value.port | default('') }}"
      port_mode: "{{ item.value.mode | default('POM_UNTAGGED') | regex_replace('^tagged$', 'POM_TAGGED_STATIC') | regex_replace('^untagged$', 'POM_UNTAGGED') | regex_replace('^forbid$', 'POM_FORBIDDEN') }}"
      api_version: "{{ ansible_api_version }}"
      use_ssl: "{{ ansible_use_ssl }}"
      port: "{{ ansible_port }}"
      host: "{{ ansible_host }}"
      username: "{{ ansible_user }}"
      password: "{{ ansible_password }}"
    loop: "{{ lookup('dict', vlans) }}"
    when: "'port' in dict(item)"
    tags:
      - vlans
      - vlans_mode

How I can make nested loop in Ansible ?

  - name: Debug2
    debug:
      msg: "Name: {{ item.key }} - mode: {{ item.value.mode }}"
    loop: "{{ lookup('dict', vlans) }}"
    when: "'mode' in dict(item.value)"
    tags:
      - debug

Debug 2 return :

ok: [sw39stack01.group.corp] => (item={'key': 'Servers', 'value': {'vlan_id': 10, 'ip': '192.168.22.20', 'mask': '255.255.255.0', 'mode': {'tagged': '1/1,1/2', 'untagged': '1/3'}}}) => { "msg": "Name: Servers - mode: {'tagged': '1/1,1/2', 'untagged': '1/3'}" } ok: [sw39stack01.group.corp] => (item={'key': 'Clients', 'value': {'vlan_id': 20, 'mode': {'tagged': '1/1,1/3'}}}) => { "msg": "Name: Clients - mode: {'tagged': '1/1,1/3'}" } skipping: [sw39stack01.group.corp] => (item={'key': 'Printers', 'value': {'vlan_id': 30}}) => { "ansible_loop_var": "item", "item": { "key": "Printers", "value": { "vlan_id": 30 } } }

Best regards,

score 2 · Answer 1 · answered Apr 27 '23 at 23:32

Convert the dictionaries mode to lists

  modes: |
    {% for k,v in vlans.items() %}
    {{ k }}:
      mode: {{ v.mode|d({})|dict2items }}
    {% endfor %}
  vlans2: "{{ vlans|combine(modes|from_yaml, recursive=true) }}"

gives

  vlans2:
    Clients:
      mode:
      - key: tagged
        value: 1/1,1/3
      vlan_id: 20
    Printers:
      mode: []
      vlan_id: 30
    Servers:
      ip: 192.168.22.20
      mask: 255.255.255.0
      mode:
      - key: tagged
        value: 1/1,1/2
      - key: untagged
        value: 1/3
      vlan_id: 10

Convert the dictionary vlans2 to a list and iterate with subelements value.mode

    - debug:
        msg: "{{ item.0.key }} {{ item.1.key }} {{ item.1.value }}"
      loop: "{{ vlans2|dict2items|subelements('value.mode') }}"

gives (abridged)

  msg: Servers tagged 1/1,1/2
  msg: Servers untagged 1/3
  msg: Clients tagged 1/1,1/3

^{Example of a complete playbook
- hosts: localhost

vars:

vlans:
Servers:
vlan_id: 10
ip: 192.168.22.20
mask: 255.255.255.0
mode:
tagged: 1/1,1/2
untagged: 1/3
Clients:
vlan_id: 20
mode:
tagged: 1/1,1/3
Printers:
vlan_id: 30

modes: |
{% for k,v in vlans.items() %}
{{ k }}:
mode: {{ v.mode|d({})|dict2items }}
{% endfor %}
vlans2: "{{ vlans|combine(modes|from_yaml, recursive=true) }}"

tasks:

- debug:
var: modes|from_yaml
- debug:
var: vlans2
- debug:
msg: "{{ item.0.key }} {{ item.1.key }} {{ item.1.value }}"
loop: "{{ vlans2|dict2items|subelements('value.mode') }}"}

score 0 · Answer 2 · answered Apr 27 '23 at 20:13

Inventory file are edited like this:

vlans:
  - name: Servers
    vlan_id: 10
    ip: 192.168.22.20
    mask: 255.255.255.0
    mode:
      - tagged: 1/1,1/2
      - untagged: 1/3
  - name: Clients
    vlan_id: 20
    mode:
      - tagged: 1/1,1/3
  - name: Printers
    vlan_id: 30

And query is used:

  - name: Debug1
    ansible.builtin.debug: var=item
    loop: "{{ query('subelements', vlans, 'mode', {'skip_missing': True}) }}"
    tags:
      - debug

Output work as expected:

ok: [sw] => (item=[{'name': 'Servers', 'vlan_id': 10, 'ip': '192.168.22.20', 'mask': '255.255.255.0'}, {'tagged': '1/1,1/2'}]) => {
    "ansible_loop_var": "item",
    "item": [
        {
            "ip": "192.168.22.20",
            "mask": "255.255.255.0",
            "name": "Servers",
            "vlan_id": 10
        },
        {
            "tagged": "1/1,1/2"
        }
    ]
}
ok: [sw] => (item=[{'name': 'Servers', 'vlan_id': 10, 'ip': '192.168.22.20', 'mask': '255.255.255.0'}, {'untagged': '1/3'}]) => {
    "ansible_loop_var": "item",
    "item": [
        {
            "ip": "192.168.22.20",
            "mask": "255.255.255.0",
            "name": "Servers",
            "vlan_id": 10
        },
        {
            "untagged": "1/3"
        }
    ]
}

Ansible : Loop inside loop

2 Answers2