kubespray/roles/network_plugin/calico/tasks/pre.yml

---
- name: Calico | Get kubelet hostname
  shell: >-
    set -o pipefail && {{ bin_dir }}/kubectl get node -o custom-columns='NAME:.metadata.name,INTERNAL-IP:.status.addresses[?(@.type=="InternalIP")].address'
    | egrep "{{ ansible_all_ipv4_addresses | join('$|') }}$" | cut -d" " -f1
  args:
    executable: /bin/bash
  register: calico_kubelet_name
  delegate_to: "{{ groups['kube-master'][0] }}"
  when:
    - "cloud_provider is defined"