kubespray/roles/kubernetes-apps/ansible/tasks/cleanup_dns.yml

---
- name: Kubernetes Apps | Register coredns deployment annotation `createdby`
  shell: "{{ bin_dir }}/kubectl get deploy -n kube-system coredns -o jsonpath='{ .spec.template.metadata.annotations.createdby }'"
  register: createdby_annotation
  changed_when: false
  ignore_errors: true
  when:
    - dns_mode in ['coredns', 'coredns_dual']
    - inventory_hostname == groups['kube_control_plane'][0]

- name: Kubernetes Apps | Delete kubeadm CoreDNS
  kube:
    name: "coredns"
    namespace: "kube-system"
    kubectl: "{{ bin_dir }}/kubectl"
    resource: "deploy"
    state: absent
  when:
    - dns_mode in ['coredns', 'coredns_dual']
    - inventory_hostname == groups['kube_control_plane'][0]
    - createdby_annotation.stdout != 'kubespray'

- name: Kubernetes Apps | Delete kubeadm Kube-DNS service
  kube:
    name: "kube-dns"
    namespace: "kube-system"
    kubectl: "{{ bin_dir }}/kubectl"
    resource: "svc"
    state: absent
  when:
    - dns_mode in ['coredns', 'coredns_dual']
    - inventory_hostname == groups['kube_control_plane'][0]