Extract specific fields information from Ansible kubernetes.core.k8s_info? - ansible

Question

I have the following tasks, to gather the pods information, more exactly the name and status:
- name: Get pod info
kubernetes.core.k8s_info:
api_version: v1
kind: Pod
label_selectors:
- helmcharts.helm.cattle.io/chart = {{ item }}
- job-name = helm-install-{{ item }}
namespace: kube-system
loop:
- traefik
- traefik-crd
register: pod_info
- name: Debug
ansible.builtin.debug:
var: pod_info
Simplified output:
ok: [apollo.lan] => {
"pod_info": {
"changed": false,
"msg": "All items completed",
"results": [
{
"ansible_loop_var": "item",
"api_found": true,
"changed": false,
"failed": false,
"item": "traefik",
"resources": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"helmcharts.helm.cattle.io/chart": "traefik",
"job-name": "helm-install-traefik"
},
"name": "helm-install-traefik-fk7fb",
"namespace": "kube-system",
"resourceVersion": "2550"
},
"status": {
"phase": "Succeeded",
"podIP": "10.0.0.75"
}
}
]
},
{
"ansible_loop_var": "item",
"api_found": true,
"changed": false,
"failed": false,
"item": "traefik-crd",
"resources": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"labels": {
"helmcharts.helm.cattle.io/chart": "traefik-crd",
"job-name": "helm-install-traefik-crd"
},
"name": "helm-install-traefik-crd-8p86c",
"namespace": "kube-system",
"resourceVersion": "2329"
},
"status": {
"phase": "Succeeded",
"podIP": "10.0.0.76"
}
}
]
}
],
"skipped": false
}
}
I don't know how to extract and register the pod name as list, combined with a when condition that matches the status phase Succeeded.
I first tried to extract just the metadata, in order to drill down to name:
- name: Set fact
ansible.builtin.set_fact:
variable: "{{ pod_info.results | json_query('metadata') }}"
Without success. I have a hard time determining the logic with a mix of lists and dictionaries, I even tried to look at lookup('ansible.utils.to_paths', pod_info.results) structure to see how I can pull the information.

Answer 1

Preliminary remark: I wouldn't do a loop to select the two pods you are looking for, I would rather use a in, like they are showing it in the examples.
So, your first task would become:
- name: Get pod info
kubernetes.core.k8s_info:
api_version: v1
kind: Pod
label_selectors:
- helmcharts.helm.cattle.io/chart in (traefik, traefik-crd)
- job-name in (helm-install-traefik, helm-install-traefik-crd)
namespace: kube-system
register: pod_info
The reason for it is simple: by registering under a loop, you are complexifying the return, as Ansible will create a results list for each elements of the loop, when you won't have it with this way of requesting the Kubernetes pods information.
And so, with this, listing all the pods having the status phase Succeeded should be achievable with
the selectattr filter, in order to filter only the successful status phases
the map filter in order to extract only the names of the pods
- debug:
var: >-
pod_info.resources
| selectattr('status.phase', '==', 'Succeeded')
| map(attribute='metadata.name')