kubespray/roles/remove-node/pre-remove/tasks/main.yml

---
- name: remove-node | List nodes
  command: >-
    {{ kubectl }} get nodes -o go-template={% raw %}'{{ range .items }}{{ .metadata.name }}{{ "\n" }}{{ end }}'{% endraw %}
  register: nodes
  when:
    - groups['kube_control_plane'] | length > 0
  delegate_to: "{{ groups['kube_control_plane']|first }}"
  changed_when: false
  run_once: true

- name: remove-node | Drain node except daemonsets resource  # noqa 301
  command: >-
    {{ kubectl }} drain
      --force
      --ignore-daemonsets
      --grace-period {{ drain_grace_period }}
      --timeout {{ drain_timeout }}
      --delete-emptydir-data {{ kube_override_hostname|default(inventory_hostname) }}
  when:
    - groups['kube_control_plane'] | length > 0
    # ignore servers that are not nodes
    - kube_override_hostname|default(inventory_hostname) in nodes.stdout_lines
  register: result
  failed_when: result.rc != 0 and not allow_ungraceful_removal
  delegate_to: "{{ groups['kube_control_plane']|first }}"
  until: result.rc == 0 or allow_ungraceful_removal
  retries: "{{ drain_retries }}"
  delay: "{{ drain_retry_delay_seconds }}"

- name: remove-node | Wait until Volumes will be detached from the node
  command: >-
    {{ kubectl }} get volumeattachments -o go-template={% raw %}'{{ range .items }}{{ .spec.nodeName }}{{ "\n" }}{{ end }}'{% endraw %}
  register: nodes_with_volumes
  delegate_to: "{{ groups['kube_control_plane']|first }}"
  changed_when: false
  until: not (kube_override_hostname|default(inventory_hostname) in nodes_with_volumes.stdout_lines)
  retries: 3
  delay: "{{ drain_grace_period }}"
  when:
    - groups['kube_control_plane'] | length > 0
    - not allow_ungraceful_removal
    - kube_override_hostname|default(inventory_hostname) in nodes.stdout_lines