---
- hosts: control-plane
  name: "rename CP"

  tasks:
    - name:
      set_fact:
        hostnameid: "{{ groups[group_names[0]].index(inventory_hostname) | int + 1 }}"
    - debug:
        msg: "K8s-{{ group_names[0] }}{{ hostnameid }}"

    - name: set hostname
      become: yes
      hostname:
        name: "K8s-{{ group_names[0] }}{{ hostnameid }}"
        use: systemd

- hosts: worker-node
  name: "rename WN"
 
  tasks:
    - name:
      set_fact:
        hostnameid: "{{ groups[group_names[0]].index(inventory_hostname) | int + 1 }}"
    - debug:
        msg: "K8s-{{ group_names[0] }}{{ hostnameid }}"

    - name: set hostname
      become: yes
      hostname:
        name: "K8s-{{ group_names[0] }}{{ hostnameid }}"
        use: systemd

- hosts: all
  name: "change host file"

  tasks:
    - name: generate file
      become: yes
      blockinfile:
        backup: yes
        path: /etc/hosts
        block: |
          {% for host in groups['all'] %}
          {{ hostvars[host]['ansible_facts']['eth0']['ipv4']['address'] }} {{ hostvars[host]['ansible_facts']['fqdn'] }} {{ hostvars[host]['ansible_facts']['hostname'] }}
          {% endfor %}