Purge /etc/hosts of multiple lines that contains $HOSTNAME without the default ipv4 ip address.

See : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=316099

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Enhancements
 * Add example playbook.
 * localhost line sould not contain hostname information (see https://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_hostname_resolution).
+* Purge /etc/hosts of multiple lines that contains $HOSTNAME without the default ipv4 ip address.
 
 ## v1.0
 

README.md

@@ -48,7 +48,9 @@ Manage some basics configuration for IPR's servers.
 ### 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.
+  - You can choose to define the localhost (127.0.0.1) line content.
+  - You can choose to define the permanent ip (127.0.0.1) line content.
+    - All other lines that contains hostname without this permanent ip will be removed.
 
 ## Development
 

tasks/main.yml

@@ -1,6 +1,8 @@
 ---
 # tasks file for basics
 
+## Modify /etc/hosts
+
 - name: Set 127.0.0.1 line in hosts file
   lineinfile:
     dest: /etc/hosts
@@ -20,3 +22,14 @@
     backup: yes
   when: (basics__hosts_ipv4_manage and
          ansible_default_ipv4.address is defined)
+  register: basics__register_ipv4_line
+
+- name: Purge other lines with hostname
+  lineinfile:
+    dest: /etc/hosts
+    state: absent
+    regexp: '^(?!({{ ansible_default_ipv4.address }})).*{{ ansible_hostname }}'
+    backup: yes
+  when: basics__register_ipv4_line.changed
+
+## }}}