looping through dictionary-formatted Ansible facts-CodePudding

Considering the output of ios_facts module (or any similar gathering fact module), I wrote the following Ansible playbook:

name: checking interface status
gather_facts: no
hosts: iosxe
tasks:
  name: get cisco config
    cisco.ios.ios_facts:
      gather_subset: all
    register: cisco_output
  name: task001
  debug:
    var: cisco_output['ansible_facts']['ansible_net_interfaces']
  loop: "{{ ansible_facts['ansible_net_interfaces'] | dict2items }}"
  when: item.lineprotocol == "up"

For the sake of practicing Ansible, I wanted the playbook to show list of interfaces in "up" state. The relative part in the output of the "ios_fact" shows that it is a "dictionary" not "list".

"ansible_net_interfaces": {
"GigabitEthernet1": {
    "bandwidth": 1000000,
    "description": null,
    "duplex": "Full",
    "ipv4": [
        {
            "address": "10.106.31.229",
            "subnet": "24"
        }
    ],
    "lineprotocol": "up",
    "macaddress": "000c.29c3.a8f3",
    "mediatype": "Virtual",
    "mtu": 1500,
    "operstatus": "up",
    "type": "CSR vNIC"
},
"GigabitEthernet2": {
    "bandwidth": 1000000,
    "description": "CSR2",
    "duplex": "Full",
    "ipv4": [
        {
            "address": "10.171.73.33",
            "subnet": "27"
        }
    ],
    "lineprotocol": "up",
    "macaddress": "000c.29c3.a8fd",
    "mediatype": "Virtual",
    "mtu": 1500,
    "operstatus": "up",
    "type": "CSR vNIC"
}, ...

I got several different errors and tried to workaround by changing the playbook each time as these:

loop: "{{ ansible_facts['ansible_net_interfaces'] | dict2items }}"
loop: "{{ cisco_output['ansible_facts']['ansible_net_interfaces'] }}"
loop: "{{ cisco_output['ansible_facts']['ansible_net_interfaces'] | dict2items }}"

But was unsuccessful as I got different errors again. What would be the right way of this?

CodePudding user response：

The dict2items filter will convert the dict to an array of items, where the keys will be GigabitEthernet1, GigabitEthernet2, and the values of these keys will sub-dicts.

"item.key": "GigabitEthernet1"
"item.key": "GigabitEthernet2"

So, the lineprotocol key will be in the item.value, i.e. item.value.lineprotocol. A simple task such as below can demonstrate the same:

    - debug:
        msg: "{{ item.key }} is up"
      loop: "{{ cisco_output['ansible_facts']['ansible_net_interfaces  | dict2items }}"
      when: item.value.lineprotocol == "up"

CodePudding user response：

The attribute ipv4 is a list. Use with_subelements if you want to take into account the fact that there might be more IP addresses configured, e.g.

    - debug:
        msg: "{{ item.0.key }} {{ item.1.address }}"
      with_subelements:
        - "{{ ansible_net_interfaces|dict2items|
              selectattr('value.lineprotocol', 'eq', 'up') }}"
        - value.ipv4

gives

  msg: GigabitEthernet1 10.106.31.229
  msg: GigabitEthernet2 10.171.73.33