One of the things, that I hate the most about an infrastructure is to have an inconsistent platform. Obviously DNS runs but it could fail, and then it’s always good to rely on your /etc/hosts. However before this, it must be consistent.

The template file:

127.0.0.1   localhost   {{ ansible_hostname }}

192.168.0.1     bla1.mydomain
192.168.0.2     bla2.mydomain
192.168.0.3     bla3.mydomain
192.168.0.4     bla4.mydomain
192.168.0.5     bla5.mydomain

The yaml file:

---
- hosts: all

  tasks:
      - name: template test
        action: template src=templates/hosts.j2 dest=/etc/hosts

Run it:

$ ansible-playbook -i hosts_infra --user=leseb --sudo hosts.yml

I hope consistency maniacs will like this ;-)