kubespray/roles/network_plugin/flannel/tasks/reset.yml

---
- name: Reset | check cni network device
  stat:
    path: /sys/class/net/cni0
    get_attributes: false
    get_checksum: false
    get_mime: false
  register: cni

- name: Reset | remove the network device created by the flannel
  command: ip link del cni0
  when: cni.stat.exists

- name: Reset | check flannel network device
  stat:
    path: /sys/class/net/flannel.1
    get_attributes: false
    get_checksum: false
    get_mime: false
  register: flannel

- name: Reset | remove the network device created by the flannel
  command: ip link del flannel.1
  when: flannel.stat.exists