Feature: Add CoreDNS Customization Options

Problem: Before, to customize CoreDNS, one had to edit the default configmap, which gets re-written on every K3s server restart. Solution: Mount an additional coredns-custom configmap into the CoreDNS container and import overrides and additional server blocks from the included files. Signed-off-by: Thorsten Klein <iwilltry42@gmail.com>

Feature: Add CoreDNS Customization Options
41ff19de · Thorsten Klein · Brad Davidson · 4b57951f · 41ff19de · 41ff19de
Commit 41ff19de authored Nov 04, 2021 by Thorsten Klein Committed by Brad Davidson Nov 11, 2021
4 changed files
--- a/manifests/coredns.yaml
+++ b/manifests/coredns.yaml
@@ -73,6 +73,7 @@ data:
        reload
        loadbalance
    }
+    import /etc/coredns/custom/*.server
 ---
 apiVersion: apps/v1
 kind: Deployment
@@ -131,6 +132,9 @@ spec:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
+        - name: custom-config-volume
+          mountPath: /etc/coredns/custom
+          readOnly: true
        ports:
        - containerPort: 53
          name: dns
@@ -179,6 +183,10 @@ spec:
              path: Corefile
            - key: NodeHosts
              path: NodeHosts
+        - name: custom-config-volume
+          configMap:
+            name: coredns-custom
+            optional: true
 ---
 apiVersion: v1
 kind: Service

--- a/pkg/apis/k3s.cattle.io/v1/zz_generated_deepcopy.go
+++ b/pkg/apis/k3s.cattle.io/v1/zz_generated_deepcopy.go
+//go:build !ignore_autogenerated
 // +build !ignore_autogenerated

 /*

--- a/pkg/deploy/zz_generated_bindata.go
+++ b/pkg/deploy/zz_generated_bindata.go
--- a/pkg/static/zz_generated_bindata.go
+++ b/pkg/static/zz_generated_bindata.go