refactor: refactor dns (#218)

* refactor: refactor dns

* refactor: optimize forward dns server

* refactor: add short domain test

* refactor: fix remove nameserver from resolver bug

---------

Co-authored-by: wencaiwulue <895703375@qq.com>

charts/kubevpn/templates/service.yaml

@@ -23,5 +23,9 @@ spec:
       port: {{ .Values.service.port80 }}
       protocol: TCP
       targetPort: 80
+    - name: 53-for-dns
+      port: {{ .Values.service.port53 }}
+      protocol: UDP
+      targetPort: 53
   selector:
     {{- include "kubevpn.selectorLabels" . | nindent 4 }}

charts/kubevpn/values.yaml

@@ -55,6 +55,7 @@ service:
   port9002: 9002
   port10800: 10800
   port80: 80
+  port53: 53
 
 resources:
   limits: