kubespray/roles/kubernetes/master/tasks/pre-upgrade.yml

---
- name: "Pre-upgrade | check for kube-apiserver unit file"
  stat:
    path: /etc/systemd/system/kube-apiserver.service
  register: kube_apiserver_service_file

- name: "Pre-upgrade | check for kube-apiserver init script"
  stat:
    path: /etc/init.d/kube-apiserver
  register: kube_apiserver_init_script

- name: "Pre-upgrade | stop kube-apiserver if service defined"
  service:
    name: kube-apiserver
    state: stopped
  when: (kube_apiserver_service_file.stat.exists|default(False) or kube_apiserver_init_script.stat.exists|default(False))

- name: "Pre-upgrade | remove kube-apiserver service definition"
  file:
    path: "{{ item }}"
    state: absent
  when: (kube_apiserver_service_file.stat.exists|default(False) or kube_apiserver_init_script.stat.exists|default(False))
  with_items:
    - /etc/systemd/system/kube-apiserver.service
    - /etc/init.d/kube-apiserver