feat: add a paramater to disable host nameservers (#9357)

Signed-off-by: eminaktas <eminaktas34@gmail.com>

Signed-off-by: eminaktas <eminaktas34@gmail.com>

inventory/sample/group_vars/all/all.yml

@@ -35,6 +35,11 @@ loadbalancer_apiserver_healthcheck_port: 8081
 
 ### OTHER OPTIONAL VARIABLES
 
+## By default, Kubespray collects nameservers on the host. It then adds the previously collected nameservers in nameserverentries.
+## If true, Kubespray does not include host nameservers in nameserverentries in dns_late stage. However, It uses the nameserver to make sure cluster installed safely in dns_early stage.
+## Use this option with caution, you may need to define your dns servers. Otherwise, the outbound queries such as www.google.com may fail.
+# disable_host_nameservers: false
+
 ## Upstream dns servers
 # upstream_dns_servers:
 #   - 8.8.8.8

roles/kubernetes/preinstall/tasks/0040-set_facts.yml

@@ -201,7 +201,7 @@
 - name: generate nameservers for resolvconf, including cluster DNS
   set_fact:
     nameserverentries: |-
-      {{ (([nodelocaldns_ip] if enable_nodelocaldns else []) + (coredns_server|d([]) if not enable_nodelocaldns else []) + nameservers|d([]) + cloud_resolver|d([]) + configured_nameservers|d([])) | unique | join(',') }}
+      {{ (([nodelocaldns_ip] if enable_nodelocaldns else []) + (coredns_server|d([]) if not enable_nodelocaldns else []) + nameservers|d([]) + cloud_resolver|d([]) + (configured_nameservers|d([]) if not disable_host_nameservers|d()|bool else [])) | unique | join(',') }}
     supersede_nameserver:
       supersede domain-name-servers {{ ( ( [nodelocaldns_ip] if enable_nodelocaldns else []) + coredns_server|d([]) + nameservers|d([]) + cloud_resolver|d([])) | unique | join(', ') }};
   when: not dns_early or dns_late