kubespray/roles/kubernetes/master/tasks/kubeadm-version.yml

---
- name: gets the kubeadm version
  command: "{{ bin_dir }}/kubeadm version -o short"
  register: kubeadm_output

- name: sets kubeadm api version to v1beta2
  set_fact:
    kubeadmConfig_api_version: v1beta2
  when: kubeadm_output.stdout is version('v1.15.0', '>=')

- name: kubeadm | Create kubeadm config
  template:
    src: "kubeadm-config.{{ kubeadmConfig_api_version }}.yaml.j2"
    dest: "{{ kube_config_dir }}/kubeadm-config.yaml"
    mode: 0640