ipv4 only work

roles/ipv4_only/handlers/main.yml

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+# code: language=ansible
+
+- name: Reboot
+  ansible.builtin.reboot:
+    reboot_timeout: 180

roles/ipv4_only/tasks/main.yml

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+# code: language=ansible
+
+- name: Disable ipv6 (all)
+  ansible.posix.sysctl:
+    name: "{{ item }}"
+    reload: true
+    state: present
+    sysctl_set: true
+    value: 1
+  loop:
+    - net.ipv6.conf.all.disable_ipv6
+    - net.ipv6.conf.default.disable_ipv6
+    - net.ipv6.conf.lo.disable_ipv6
+  notify:
+    - Reboot
+
+- name: Remove IPv6 localhost entries from /etc/hosts
+  when:
+    - (ipv4_only | default(false))
+  ansible.builtin.lineinfile:
+    path: /etc/hosts
+    line: "{{ item }}"
+    state: absent
+  loop:
+    - '::1 localhost ip6-localhost ip6-loopback'
+    - 'ff02::1 ip6-allnodes'
+    - 'ff02::2 ip6-allrouters'
+  notify:
+    - Reboot
+
+- name: Flush handlers to trigger reboot if required
+  ansible.builtin.meta: flush_handlers

roles/ipv4_only/vars/main.yml

@@ -0,0 +1 @@
+# code: language=ansible