playbook-hosts.yml

---
- hosts: all
  become: true
  become_user: root
  become_method: sudo
  gather_facts: yes

  vars:
    internal_domain: example.org

  tasks:
   - name: setting hostname from inventory
     hostname: name="{{ inventory_hostname }}.{{ internal_domain }}"
     when: internal_domain is defined

   - name: setting hostname from inventory
     hostname: name="{{ inventory_hostname }}"
     when: internal_domain is not defined

   - name: generate static hosts as defined
     blockinfile:
       dest: /etc/hosts
       block: |
         10.64.32.1     database-master    database-master.{{ internal_domain }}
         10.64.64.1     database-backup    database-backup.{{ internal_domain }}
         10.64.128.10   monitor-server-1   monitor-server-1.{{ internal_domain }}
         10.64.228.10   monitor-server-2   monitor-server-2.{{ internal_domain }}
         10.64.128.20   rsyslog-server-1   rsyslog-server-1.{{ internal_domain }}
         10.64.228.20   rsyslog-server-2   rsyslog-server-2.{{ internal_domain }}
         10.64.128.20   ssh-proxy-host-1   ssh-proxy-host-1.{{ internal_domain }}
         10.64.228.20   ssh-proxy-host-2   ssh-proxy-host-2.{{ internal_domain }}


   - name: generate dynamic hosts from inventory
     lineinfile:
       state: present
       dest: /etc/hosts
       regexp: '.*{{ item }}$'
       line: "{{ hostvars[item].ansible_host }} {{item}}"
     when: hostvars[item].ansible_host is defined
     with_items: "{{ groups['all'] }}"