kubespray/roles/kubernetes/node-label/tasks/main.yml

---
- name: Kubernetes Apps | Wait for kube-apiserver
  uri:
    url: "{{ kube_apiserver_endpoint }}/healthz"
    validate_certs: no
    client_cert: "{{ kube_apiserver_client_cert }}"
    client_key: "{{ kube_apiserver_client_key }}"
  register: result
  until: result.status == 200
  retries: 10
  delay: 6
  when: inventory_hostname == groups['kube-master'][0]

- name: Set role node label to empty list
  set_fact:
    role_node_labels: []

- name: Node label for nvidia GPU nodes
  set_fact:
    role_node_labels: "{{ role_node_labels + [ 'nvidia.com/gpu=true' ] }}"
  when:
    - nvidia_gpu_nodes is defined
    - nvidia_accelerator_enabled|bool
    - inventory_hostname in nvidia_gpu_nodes

- name: Set inventory node label to empty list
  set_fact:
    inventory_node_labels: []

- name: Populate inventory node label
  set_fact:
    inventory_node_labels: "{{ inventory_node_labels + [ '%s=%s'|format(item.key, item.value) ] }}"
  loop: "{{ node_labels|d({})|dict2items }}"
  when:
    - node_labels is defined
    - node_labels is mapping

- debug: var=role_node_labels
- debug: var=inventory_node_labels

- name: Set label to node
  command: >-
      {{ bin_dir }}/kubectl label node {{ inventory_hostname }} {{ item }} --overwrite=true
  loop: "{{ role_node_labels + inventory_node_labels }}"
  delegate_to: "{{ groups['kube-master'][0] }}"
  changed_when: false
...