From 129eea930283d0b2bd28641c6c3ae0cb7630fba1 Mon Sep 17 00:00:00 2001
From: "andrii.k" <andriikrymus@gmail.com>
Date: Wed, 19 Jun 2024 09:17:50 +0300
Subject: [PATCH] add prefetch options to configuration

---
 stable/node-local-dns/Chart.yaml              |  2 +-
 stable/node-local-dns/README.md               |  6 +++++-
 .../node-local-dns/templates/configmap.yaml   | 21 +++++++++++++++++++
 stable/node-local-dns/values.yaml             |  7 +++++++
 4 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/stable/node-local-dns/Chart.yaml b/stable/node-local-dns/Chart.yaml
index ac655ed9..b0e137d4 100644
--- a/stable/node-local-dns/Chart.yaml
+++ b/stable/node-local-dns/Chart.yaml
@@ -1,6 +1,6 @@
 apiVersion: v2
 name: node-local-dns
-version: 2.0.11
+version: 2.0.12
 appVersion: 1.23.1
 maintainers:
 - name: gabrieladt
diff --git a/stable/node-local-dns/README.md b/stable/node-local-dns/README.md
index 219dc882..829791b5 100644
--- a/stable/node-local-dns/README.md
+++ b/stable/node-local-dns/README.md
@@ -1,6 +1,6 @@
 # node-local-dns
 
-![Version: 2.0.11](https://img.shields.io/badge/Version-2.0.11-informational?style=flat-square) ![AppVersion: 1.23.1](https://img.shields.io/badge/AppVersion-1.23.1-informational?style=flat-square)
+![Version: 2.0.12](https://img.shields.io/badge/Version-2.0.12-informational?style=flat-square) ![AppVersion: 1.23.1](https://img.shields.io/badge/AppVersion-1.23.1-informational?style=flat-square)
 
 A chart to install node-local-dns.
 
@@ -57,6 +57,10 @@ helm install my-release deliveryhero/node-local-dns -f values.yaml
 | config.dnsServer | string | `"172.20.0.10"` |  |
 | config.healthPort | int | `8080` |  |
 | config.localDns | string | `"169.254.20.25"` |  |
+| config.prefetch.amount | int | `3` |  |
+| config.prefetch.duration | string | `"30s"` |  |
+| config.prefetch.enabled | bool | `false` |  |
+| config.prefetch.percentage | string | `"20%"` |  |
 | config.setupInterface | bool | `true` |  |
 | config.setupIptables | bool | `true` |  |
 | config.skipTeardown | bool | `false` |  |
diff --git a/stable/node-local-dns/templates/configmap.yaml b/stable/node-local-dns/templates/configmap.yaml
index 970cf381..8db37183 100644
--- a/stable/node-local-dns/templates/configmap.yaml
+++ b/stable/node-local-dns/templates/configmap.yaml
@@ -16,6 +16,9 @@ data:
         cache {
                 success 9984 30
                 denial 9984 5
+            {{- if .Values.config.prefetch.enabled}}
+                prefetch {{ .Values.config.prefetch.amount }} {{ .Values.config.prefetch.duration }} {{ .Values.config.prefetch.percentage }}
+            {{- end }}
         }
         reload
         loop
@@ -32,7 +35,13 @@ data:
         }
     in-addr.arpa:53 {
         errors
+    {{- if .Values.config.prefetch.enabled}}
+        cache 30 {
+                prefetch {{ .Values.config.prefetch.amount }} {{ .Values.config.prefetch.duration }} {{ .Values.config.prefetch.percentage }}
+        }
+    {{- else }}
         cache 30
+    {{- end }}
         reload
         loop
     {{- if .Values.config.bindIp }}
@@ -47,7 +56,13 @@ data:
         }
     ip6.arpa:53 {
         errors
+    {{- if .Values.config.prefetch.enabled}}
+        cache 30 {
+                prefetch {{ .Values.config.prefetch.amount }} {{ .Values.config.prefetch.duration }} {{ .Values.config.prefetch.percentage }}
+        }
+    {{- else }}
         cache 30
+    {{- end }}
         reload
         loop
     {{- if .Values.config.bindIp }}
@@ -62,7 +77,13 @@ data:
         }
     .:53 {
         errors
+    {{- if .Values.config.prefetch.enabled}}
+        cache 30 {
+                prefetch {{ .Values.config.prefetch.amount }} {{ .Values.config.prefetch.duration }} {{ .Values.config.prefetch.percentage }}
+        }
+    {{- else }}
         cache 30
+    {{- end }}
         reload
         loop
     {{- if .Values.config.bindIp }}
diff --git a/stable/node-local-dns/values.yaml b/stable/node-local-dns/values.yaml
index 17008181..38ee7b93 100644
--- a/stable/node-local-dns/values.yaml
+++ b/stable/node-local-dns/values.yaml
@@ -22,6 +22,13 @@ config:
   # Set communication protocol. Options are `prefer_udp` or `force_tcp`
   commProtocol: "force_tcp"
 
+  # If enabled, coredns will prefetch popular items when they are about to be expunged from the cache. https://coredns.io/plugins/cache/
+  prefetch:
+    enabled: false
+    amount: 3
+    duration: 30s
+    percentage: 20%
+
   # Port used for the health endpoint
   healthPort: 8080