Manage localhost and default_ipv4 line in /etc/hosts.

CHANGELOG.md

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+
+## v1.0
+
+### Features
+* Manage localhost line in /etc/hosts.
+* Manage ipv4 line in /etc/hosts.

README.md

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+# Basics
+
+1. [Overview](#overview)
+2. [Role Variables](#role-variables)
+3. [Example Playbook](#example-playbook)
+4. [Configuration](#configuration)
+    * [Hosts](#hosts)
+5. [Development](#development)
+6. [License](#license)
+7. [Author Information](#author-information)
+
+## Overview
+
+Manage some basics configuration for IPR's servers.
+
+## Role Variables
+
+* **basics__domain** : Domain to use [default : `{{ ansible_domain }}`].
+* **basics__hosts_localhost_manage** : If the localhost (127.0.0.1) line should be managed [default : `false`].
+* **basics__hosts_localhost_content** : Content of the localhost (127.0.0.1) line [default : `{{ ansible_hostname }}.{{ basics__domain }} {{ ansible_hostname }} localhost.localdomain localhost`].
+* **basics__hosts_ipv4_manage** : If the ipv4 (lan) line should be managed [default : `false`].
+* **basics__hosts_ipv4_content** : Content of the ipv4 (lan) line [default : `{{ ansible_hostname }}.{{ basics__domain }} {{ ansible_hostname }}`].
+
+## Example Playbook
+
+* Use defaults vars :
+
+``` yml
+- hosts: serverXYZ
+  roles:
+    - role: ipr-cnrs.basics
+```
+
+## Configuration
+
+### Hosts
+- Ensure to have the correct fqdn and hostname in /etc/hosts.
+  - You can define the domain if it's not correct on the remote host.
+  - You can choose to define the localhost (127.0.0.1) line or/and the ipv4 (lan) line.
+
+## Development
+
+This source code comes from our [Gogs instance][basics source] and the [Github repo][basics github] exist just to be able to send the role to Ansible Galaxy…
+
+But feel free to send issue/PR here :)
+
+Thanks to this [hook][gogs to github hook], Github automatically got updates from our [Gogs instance][basics source] :)
+
+## License
+
+[WTFPL][wtfpl website]
+
+## Author Information
+
+Jérémy Gardais
+* Source : [on IPR's Gogs][basics source]
+* [IPR][ipr website] (Institut de Physique de Rennes)
+
+[gogs to github hook]: https://stackoverflow.com/a/21998477
+[basics source]: https://git.ipr.univ-rennes1.fr/cellinfo/ansible.basics
+[basics github]: https://github.com/ipr-cnrs/basics
+[wtfpl website]: http://www.wtfpl.net/about/
+[ipr website]: https://ipr.univ-rennes1.fr/

defaults/main.yml

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+---
+# defaults file for basics
+
+# Domain
+basics__domain: "{{ ansible_domain }}"
+
+# Manage /etc/hosts
+basics__hosts_localhost_manage: false
+basics__hosts_localhost_content: "{{ ansible_hostname }}.{{ basics__domain }} {{ ansible_hostname }} localhost.localdomain localhost"
+basics__hosts_ipv4_manage: false
+basics__hosts_ipv4_content: "{{ ansible_hostname }}.{{ basics__domain }} {{ ansible_hostname }}"
+

handlers/main.yml

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+---
+# handlers file for basics

meta/main.yml

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+galaxy_info:
+  author: "Jérémy Gardais"
+  description: "Manage some basics configurations for IPR's servers."
+  license: WTFPL
+  company: IPR
+  issue_tracker_url: https://git.ipr.univ-rennes1.fr/cellinfo/ansible.basics/issues
+  min_ansible_version: 2.2
+  platforms:
+  - name: Debian
+    versions:
+    - stretch
+  #- name: opensuse
+  #  versions:
+  #  - all
+  #  - 12.1
+  #  - 12.2
+  #  - 12.3
+  #  - 13.1
+  #  - 13.2
+  galaxy_tags:
+    - system
+    - debian

tasks/main.yml

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+---
+# tasks file for basics
+
+- name: Set 127.0.0.1 line in hosts file
+  lineinfile:
+    dest: /etc/hosts
+    state: present
+    regexp: "^{{ ansible_lo.ipv4.address }}"
+    line: "{{ ansible_lo.ipv4.address }}	{{ basics__hosts_localhost_content }}"
+    backup: yes
+  when: (basics__hosts_localhost_manage and
+         ansible_lo.ipv4.address is defined)
+
+- name: Set ipv4 line in hosts file
+  lineinfile:
+    dest: /etc/hosts
+    state: present
+    regexp: "^{{ ansible_default_ipv4.address }}"
+    line: "{{ ansible_default_ipv4.address }}	{{ basics__hosts_ipv4_content }}"
+    backup: yes
+  when: (basics__hosts_ipv4_manage and
+         ansible_default_ipv4.address is defined)

tests/inventory

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+localhost

tests/test.yml

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+---
+- hosts: localhost
+  remote_user: root
+  roles:
+    - apt