Use inline update for resolv.conf

roles/dnsmasq/tasks/main.yml

@@ -53,11 +53,37 @@
     timeout: 100
   when: inventory_hostname in groups['kube-master']
 
-- name: update resolv.conf with new DNS setup
-  template:
-    src: resolv.conf.j2
-    dest: /etc/resolv.conf
-    mode: 644
+- name: check resolvconf
+  stat: path=/etc/resolvconf/resolv.conf.d/head
+  register: resolvconf
+
+- name: target resolv.conf file
+  set_fact:
+    resolvconffile: >
+      {%- if resolvconf.stat.exists == True -%}
+      /etc/resolvconf/resolv.conf.d/head
+      {%- else -%}
+      /etc/resolv.conf
+      {%- endif -%}
+
+- name: Add search resolv.conf
+  lineinfile:
+    line: search {{ [ 'default.svc.' + dns_domain, 'svc.' + dns_domain, dns_domain ] | join(' ') }}
+    dest: "{{resolvconffile}}"
+    state: present
+    insertafter: EOF
+    backup: yes
+    follow: yes
+
+- name: Add all masters as nameserver
+  lineinfile:
+    line: nameserver {{ hostvars[item]['ansible_default_ipv4']['address'] }}
+    dest: "{{resolvconffile}}"
+    state: present
+    insertafter: EOF
+    backup: yes
+    follow: yes
+  with_items: groups['kube-master']
 
 - name: disable resolv.conf modification by dhclient
   copy: src=dhclient_nodnsupdate dest=/etc/dhcp/dhclient-enter-hooks.d/nodnsupdate mode=u+x backup=yes
@@ -67,4 +93,9 @@
   copy: src=dhclient_nodnsupdate dest=/etc/dhcp/dhclient.d/nodnsupdate mode=u+x backup=yes
   when: ansible_os_family == "RedHat"
 
+- name: update resolvconf
+  command: resolvconf -u
+  changed_when: False
+  when: resolvconf.stat.exists == True
+
 - meta: flush_handlers

roles/dnsmasq/templates/resolv.conf.j2

-; generated by ansible
-search {{ [ 'default.svc.' + dns_domain, 'svc.' + dns_domain, dns_domain ] | join(' ') }}
-{% if inventory_hostname in groups['kube-master'] %}
-nameserver {{ ansible_default_ipv4.address }}
-{% else %}
-{% for host in groups['kube-master'] %}
-nameserver {{ hostvars[host]['ansible_default_ipv4']['address'] }}
-{% endfor %}
-{% endif %}